Entries |
Document | Title | Date |
20080198904 | Multi-Channel Galvanic Isolator Utilizing a Single Transmission Channel - A galvanic isolator having a transmitting section and a receiving section is disclosed. The transmitting section includes a frame input circuit, a data encoder, and a data transmitter. The frame input circuit receives an input data frame that includes a plurality of input binary bits. The data encoder encodes the input binary bits to generate an encoded data frame that includes a sequence of encoded binary bits in which two successive encoded binary bits represent each input binary bit. The successive encoded binary bits representing a 1 are 01 or 10, and the successive encoded binary bits representing a 0 are 00 or 11. The sequences are chosen to maximize the number of transitions in the encoded data frame. A data receiver recovers the encoded data frame by examining successive pairs of encoded data bits using a clock that is reset on the edges in the encoded data frame. | 08-21-2008 |
20080219327 | Spreading code derived from weil sequences - Methods and systems relating to Weil-based spreading codes are described herein. In an embodiment, a method includes generating a set of Weil sequences, adapting a plurality of sequences of the set of Weil sequences to form a first plurality of codes, and selecting a second plurality of codes from the first plurality of codes. A code of the first plurality of codes is selected based at least on a correlation associated with the code. Each code of the first plurality of codes has a predetermined length. | 09-11-2008 |
20080232436 | Average power control of wireless transmission having a variable duty cycle - A method an apparatus for controlling a transmission signal power level of a transmitter is disclosed. The method includes receiving a root-mean-squared target power level. A duty cycle of a transmission signal is determined that indicates power on and power off periods over a predetermined sensing interval. A transmission signal power level is sensed. The transmission signal power level is adjusted to be approximately equal to the target power level divided by the duty cycle. | 09-25-2008 |
20080232437 | Base Station Transmitter For Mobile Telecommunication System, Method For That System - The present invention relates to a transmit diversity method of a mobile communication system and a base station transmitting apparatus using the same. A first code and a second code that is diversity-encoded from the first code are generated, and transmit symbols are spread with the first code and the second code. A first transmit symbol spread with the first code and a second transmit symbol spread with the second code are mapped to symbols in frequency and time domains in a frame and transmitted through antennas. Therefore, various diversity techniques can be provided to the mobile communication system, and the diversity technique is not restricted to symbols transmitted to the same mobile station and can also be applied to a 1-bit channel. | 09-25-2008 |
20080240206 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - There is provided a communication apparatus compliant with ultra wide band communication systems for improving resistance to interfering waves in combination with DS-SS (direct sequence spread spectrum). There is provided a training section based on short code spread with the same pattern repeated for each symbol length. Actual communication itself is preceded by coherent channel measurement of a transmission channel by using the training section to specify a length of the short code to be a measurement period and using N cycles of a carrier as a time resolution for measurement. A chip timing is controlled at the time resolution for measurement. At all points given by a time resolution for a measurement period, a measured value is obtained by using the short code to despread A/D-converted values from an input signal based on the chip timing. | 10-02-2008 |
20080253433 | System and method for generating multicarrier spread spectrum signals with constant envelope - A method of generating a multicarrier spread spectrum signal having a constant envelope includes partitioning multiple spreading codes into at least a first portion of spreading codes and a second portion of spreading codes. First and second modulating signals, respectively, are formed from the first and second portions of spreading codes. A first carrier spread spectrum signal is modulated with the first modulating signal to form a first modulated carrier signal, and a second carrier spread spectrum signal is modulated with the second modulating signal to form a second modulated carrier signal. The first and second modulated carrier signals are summed to form the multicarrier spread spectrum signal. The method includes combining spreading codes from the multiple spreading codes using majority voting logic to form the first and second portions of spreading codes. | 10-16-2008 |
20080260003 | Method for Transmitting a Multicarrier Spectrum-Spread Signal, Reception Method, Corresponding Transmitting, Receiving Device and Signal - A method is provided for transmitting a multicarrier spectrum-spread signal, using a plurality of spreading codes. The method includes a step of allocating a power and/or rate to each of the spreading codes, based on an information representing the noise and/or on an information representing the quality of the link, said allocating step taking into account a target rate. | 10-23-2008 |
20080260004 | SYSTEMS AND METHODS FOR DUAL-CARRIER MODULATION ENCODING AND DECODING - Systems and methods for dual-carrier modulation (DCM) encoding and decoding for communication systems. Some embodiments comprise a DCM encoder for applying a pre-transmission function to at least one 16-QAM input symbol and mapping resulting transformed symbols onto at least one larger constellation prior to transmission. Some embodiments joint decode, by a DCM decoder, a predetermined number of received data elements and compute a set of log-likelihood ratio (LLR) values for at least eight bits from a resulting at least one transformed symbol. | 10-23-2008 |
20080298439 | Device and Method for Processing Data by Modulating Sets of Spreading Pseudocodes as a Function of Data Destination Cells for a Multi-Beam Communication Satellite - A device (D) is dedicated to the processing of data by spread spectrum coding for a multi-beam communication satellite (S), each beam (B | 12-04-2008 |
20080310483 | TRANSMITTING SPREAD SIGNAL IN MOBILE COMMUNICATION SYSTEM - The present invention provides for spreading a first signal using a plurality of spreading codes, multiplexing the first spread signal by code division multiplexing, transmitting the first multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of a first antenna set, spreading a second signal using a plurality of spreading codes, multiplexing the second spread signal by code division multiplexing, transmitting the second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the first antenna set, transmitting the first multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of a second antenna set, and transmitting the second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the second antenna set, wherein the first multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the second multiplexed signal is transmitted on. | 12-18-2008 |
20080310484 | Software Adaptable High Performance Multicarrier Transmission Protocol - Techniques for reducing peak-to-average power in multicarrier transmitters employ peak cancellation with subcarriers that are impaired by existing channel conditions. The use of Carrier Interferometry (CI) coding further improves the effectiveness of peak reduction. CI coding can also be impressed onto pulse sequences in the time domain, which enhances spectral selection and facilitates peak-power control. | 12-18-2008 |
20090016411 | Bandjamming Multi-Channel DSSS Transmitter And Method Therefor - A direct sequence spread spectrum (DSSS) transmitter ( | 01-15-2009 |
20090016412 | WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD - Interference of multiplexed signals is reduced in an MC-CDMA communication system. | 01-15-2009 |
20090022209 | TRANSMITTING APPARATUS USING SPREAD-SPECTRUM TRANSMISSION METHOD - The present invention relates to a transmitting apparatus using a spread-spectrum transmission scheme. The transmitting apparatus includes a precoder for preceding a data signal by performing a product operation between a first matrix and a diagonal matrix. The preceding outputs a signal responding to the input data by performing a product operation between the first matrix and the diagonal matrix. Such a transmitting apparatus obtains a maximum diversity gain. | 01-22-2009 |
20090034587 | Signal processing device and wireless apparatus - There is provided a signal processing device and a wireless apparatus capable of not erroneously determining polarity, appropriately performing a spread modulation process, a carrier modulation process, and reception data demodulation process, improving reception accuracy, and miniaturizing a circuit, even when IF carrier frequency shift occurs. The signal processing device and the wireless apparatus includes a spread modulation unit which includes a first differential encoding process section for performing a differential encoding process on a reception data, a differential encoding process section for performing a second differential encoding process on the output, and a spread modulation process section for performing a spread modulation process on the output using a spread code; a carrier modulation unit which quadrature-modulates a transmission data spread modulation signal and a continuous wave; and a reception data decoding unit which performs a correlation process twice and a delay detection process twice. | 02-05-2009 |
20090041092 | METHOD FOR TRANSMITTING AND RECEIVING DATA IN A MULTI-CARRIER SYSTEM - A method of transmitting data in a multi-carrier communication system is disclosed. More specifically, the method includes mapping at least one data symbol to at least one subcarrier of a first frequency domain and at least one data symbol to at least one subcarrier of a second frequency domain, wherein the first frequency domain and the second frequency domain are mutually exclusive and the at least one data symbol mapped to the at least one subcarrier of the second frequency domain is multiplied by a spreading code, transforming the at least one data symbol mapped to the first frequency domain and the at least one data symbol mapped to the second frequency domain by an inverse discrete Fourier transform (IDFT) module, and transmitting the transformed data symbols to a receiving end. | 02-12-2009 |
20090060005 | Method for using a non-orthogonal pilot signal with data channel interference cancellation - A system and method for encoding/decoding data channels in a CDMA system having data channel interference cancellation, wherein data channel interference cancellation is used to remove unwanted non-orthogonal pilot signal components which are present within a demodulated data signal. This is accomplished by regenerating interference terms with respect to the non-orthogonal pilot signal and subtracting them from the demodulated data signal. | 03-05-2009 |
20090080500 | Reference Signal Structure for OFDM Based Transmissions - A method for transmitting a plurality of sequences across a plurality of bands of a wireless spectrum is described in which a first sequence is produced using a set of reference signal sequences, wherein the set of reference signal sequences comprises at least CAZAC sequences and near-CAZAC sequences. A second sequence is also produced. The first sequence is transmitted in a first band of the wireless spectrum, and the second sequence is transmitted in a second band of the wireless spectrum. The first and the second sequences are transmitted concurrently by a same user equipment. | 03-26-2009 |
20090097533 | METHOD AND APPARATUS FOR SINGLE CARRIER SPREADING - A wireless device comprises a code-assignment module configured for assigning Golay codes to be used for spreading, a spreading module configured for spreading data with the Golay codes to produce a signal, wherein the Golay codes are randomly used to spread the data, and a transmitter configured for transmitting the signal. The wireless device may transmit a first beacon signal via a set of quasi-omni beam patterns, and a second beacon signal via a set directional beam patterns. The first beacon signal has a first transmission rate that is higher than the second beacon signal's the transmission rate. Extended Golay codes having zero periodic cross-correlation may be generated from a Golay code and a set of short sequences. A data block transmitted by the wireless device may comprise Golay codes and data portions, wherein every data portion is between two Golay codes and every Golay code is between two data portions. | 04-16-2009 |
20090103593 | Array Antenna System and Spread Spectrum Beamformer Method - A method for transmitting digital beamformed signals in a transmit array antenna apparatus utilizing a single transceiver with one power amplifier, one up-frequency converter and one digital-to-analog converter for said array transmit antenna apparatus comprising the steps of: generating a first set of direct-sequence spread spectrum codes; generating a plurality of weights, each weight being a beamforming amplitude and phase or delay for each element; generating a direct-sequence spread spectrum multiplexed signal containing such weights while using one of such first-set codes per element; converting such an multiplexed signal to a convenient radio frequency; amplifying and transmitting such a multiplexed radio frequency signal to the elements; generating a second set of direct-sequence spread spectrum codes; extracting a radio frequency signal with direction-bearing weight information at each element while using a subset of codes from the second set; generating a third set of direct-sequence spread spectrum codes at each element; transmitting a signal with array gain beamformed towards a specific direction while using a transmit array apparatus composed of spaced elements, such a transmit beamformed signal being a radio frequency signal, a direct-sequence spread spectrum radio frequency signal containing a subset of codes from the third set, or a sequence of radio frequency pulses that have short duration and high power. | 04-23-2009 |
20090110035 | RADIO COMMUNICATIONS SYSTEM DESIGNED FOR A LOW-POWER RECEIVER - The invention relates to methods by which radio signals can be transmitted to, and received by, a radio receiver such that the receiver consumes very little power from a battery or energy source. The invention is applicable not only to medical implants, but any application requiring a radio receiver to operate with very low power consumption. | 04-30-2009 |
20090116542 | DIGITAL SIGNAL TRANSMISSION METHOD, TRANSMITTING APPARATUS, AND RECEIVING APPARATUS - In a digital signal transmission method according to the present invention, when N | 05-07-2009 |
20090122840 | ULTRA-WIDEBAND COMMUNICATION SYSTEM PROVIDED WITH A FREQUENCY CONTROLLED DISPERSIVE ANTENNA - Radiocommunication equipment and method comprising at least the following elements: at least one frequency scan antenna ( | 05-14-2009 |
20090129444 | Multi-code multicarrier code division multiple access system in frequency-selective fading channels - The present invention relates to a multi-code multicarrier code division multiple access system in frequency-selective fading channels. According to the present invention, the transmitting device thereof uses the mapping/spectrum-spreading units to receive the plurality of substreams, map and spread the plurality of substreams, and produce a plurality of biorthogonal keying data items. The plurality of repetition units receives the plurality of biorthogonal keying data items, respectively, repeats the plurality of biorthogonal keying data items, and produces the plurality of repeated data item. The shifting units shift the plurality of repeated data items, respectively, and produce a plurality of shifted data items. The shifted data items are orthogonal to each other. Thereby, the peak-to-average-power-ratio (PAPR) is lowered. | 05-21-2009 |
20090161734 | METHOD AND SYSTEM FOR INFORMATION TRANSMISSION - The invention relates to the information transmission between a data-transmitting apparatus and a read- and/or write module, in particular for the use of access control. According to the invention, data to be transmitted is represented as a digital signal by the data-transmitting apparatus, and this signal is converted into an ultra-broadband signal by way of the spread spectrum method, and capacitively and/or resistively transferred via the body of the user to the write- and/or read module. | 06-25-2009 |
20090207890 | Diversity transmitter-receiver in cdma system using space-time code, and method thereof - A diversity transmitting/receiving apparatus and method is provided, which is implemented using space-time trellis codes (STTC) constructed from a Pseudo Noise (PN) sequence set in a Direct Sequence (DS) CDMA system. The transmitter comprises a PN sequence generator, a space-time encoder, first and second modulators, and first and second multiple transmit antennas. The space-time encoder selects two of the multiple PN sequences to construct STTC, and space-time encodes data from a data source according to the STTC to output an Wary data symbol. The two modulators modulate the space-time encoded data according to the STTC. The two multiple transmit antennas wirelessly transmit outputs of the two modulators, respectively. By applying a method using space-time coding in a DS CDMA system including multiple transmit antennas, it is possible to achieve both diversity and additional coding gain and also to reduce multiple user interference by increasing the PN sequence length. | 08-20-2009 |
20090232190 | SIGNAL TRANSMITTING METHOD, TRANSMITTING APPARATUS, AND RECEIVING APPARATUS USED FOR THE SIGNAL TRANSMITTING METHOD - A disclosed signal transmitting method includes the steps of a) categorizing plural digital signals, obtained by performing A/D conversion on plural analog signals consecutively arranged in a time direction, into plural signal groups in an order starting from lower bits of the plural digital signals, b) performing code spreading on the plural digital signals by using a different spread frequency for each signal group and using different spread codes for each bit, c) multiplexing the spread digital signals, and d) transmitting the multiplexed plural digital signals. | 09-17-2009 |
20090245329 | SPREAD TRANSMISSION METHOD WITH POWER ALLOCATION PER USER AND PER SYMBOL - The present invention relates to a transmission method for a transmitter having Nt transmit antennas. The method (1) spreads symbols in two dimensions by means of a spreading code, the symbols coming from a signal for transmission over Nfft sub-carriers via the Nt transmit antennas. The signal is transmitted with a power pe | 10-01-2009 |
20090257476 | TRANSMISSION DEVICE, COMUNICATION SYSTEM, TRANSMISSION METHOD AND PROGRAM - A transmission device of the present, invention includes a baseband waveform generator to generate a transmission signal by using a transfer function H | 10-15-2009 |
20090279590 | SPREAD-SPECTRUM CODING OF DATA BURSTS - Certain aspects of the present disclosure relate to a method for generating spread-spectrum coded signals for transmission in a wireless communication system, and particularly for generating spread sequences of data with spreading codes that facilitate computationally efficient frequency-domain processing at a receiver. | 11-12-2009 |
20090290616 | METHOD AND APPARATUS FOR DETERMINING THE SPATIAL CHANNELS IN AN SPATIAL DIVISION MULTIPLE ACCESS (SDMA)-BASED WIRELESS COMMUNICATION SYSTEM - An access point is disclosed herein that comprises a wireless network adapter configured to support a backhaul connection for a peer node to a network; a processing system configured to calculate precoding matrices that define spatial streams; and a transceiver configured to transmit data to the nodes on the spatial streams. | 11-26-2009 |
20090310650 | FEATURELESS COHERENT CHAOTIC AMPLITUDE MODULATION | 12-17-2009 |
20090323776 | Communication System, Apparatus, And Methods - A system, method and apparatus for wireless communications are provided. In an exemplary embodiment, frequency components present in a short duration modulated complex pulse is used to represent data to be sent. In other embodiments, the complex pulse is created, modulated, then modified to have desirable frequency characteristics. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims. | 12-31-2009 |
20100002754 | TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM - The present invention provides for transmitting a spread signal in a mobile communication system. The present invention includes spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set. | 01-07-2010 |
20100027587 | SYSTEMS AND METHODS FOR HIGH DATA RATE ULTRA WIDEBAND COMMUNICATION - A high data rate UWB system implements a frame structure that uses a connected set of m-sequences comprising the lowest possible cross-correlation and perfect, or near perfect autocorrelation. Each m-sequence can be used to identify a different piconet A very efficient code matched filter can then be used to decode the frames and achieve synchronization with a piconets. | 02-04-2010 |
20100111142 | Radio Transmission Device and Radio Transmission Method - Disclosed are a radio transmission device and a radio transmission method which can reduce a processing amount or a memory amount while maintaining the randomizing effect of other cell interference. When using as a reference signal, a ZC sequence of the sequence length uniquely correlated to a transmission bandwidth of a reference signal, as the transmission bandwidth becomes smaller and the sequence length of the ZC sequence becomes shorter, the sequence is switched at a shorter time interval and as the transmission bandwidth becomes greater and the sequence length of the ZC sequence becomes longer, the switching is performed at a longer time interval. Thus, a reference signal is generated by using the ZC sequence in accordance with the timing into which the reference signal transmission bandwidth and the sequence are switched. | 05-06-2010 |
20100128757 | SPREADING SEQUENCES WITH DUAL LOW CORRELATION WINDOWS FOR QUASI-SYNCHRONOUS CODE-DIVISION MULTIPLE-ACCESS COMMUNICATIONS - Sequence generation in wireless communication is provided for sequences having good aperiodic correlation properties. In particular, dual window quasi-Barker sequences are generated that possess at least some properties of Barker sequences. In addition, the sequences can be orthogonal to mitigate multiple access interference. Dual windowing allows the sequences even after being phase modulated by data to be recognized, provided that delay in transmission is large as compared to the correlation zone. In this regard, the sequences can be utilized in quasi-synchronous spread spectrum and/or code division multiple access (CDMA) signal communication to provide orthogonality while substantially eliminating inter-user and inter-symbol interference. In addition, unlike the single window low periodic correlation sequences, system overheads, such as cyclic prefix, need not be utilized in transmission as the data modulation effect can be accounted for by the dual windowing. | 05-27-2010 |
20100142592 | METHOD AND APPARATUS WITH NOTCHED TRANSMIT FREQUENCY BINS - A wireless network ( | 06-10-2010 |
20100150211 | Orthogonal Code Division Multiplexing for Twisted Pair Channels - A plurality of data signals are separated into parallel bit streams with each parallel stream having a bandwidth characteristic such that the combined cumulative effect of all the individual bandwidths produces a spectral characteristic of the data signals that match the spectral high speed data characteristic of a twisted pair | 06-17-2010 |
20100166043 | MC-CDMA SYSTEM, TRANSMITTER AND RECEIVER - A MC-CDMA transmitter and an MC-CDMA receiver are provided, which use a novel orthogonal spreading code that allows an effect by a delay wave to appear in only a specific user. An MC-CDMA system includes: a transmitter which multiplies a transmitting signal by a sinusoidal signal which has an amplitude of r and is orthogonal as a result that the frequency periods are different among users, in a frequency domain to be spread and split into orthogonal sub-carriers, and multiplexes the sub-carriers; and a receiver for receiving a transmitting signal from the transmitter in a manner that a sinusoidal signal, which has an amplitude of r and is orthogonal as a result that the frequency periods are different among users, is multiplied by the transmitting signal in a frequency domain, and the resultant is inversely spread. | 07-01-2010 |
20100172394 | METHOD OF AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL AT VARIABLE DATA RATE IN HUMAN BODY COMMUNICATIONS - Provided are a method and apparatus for transmitting and receiving a signal at a variable data rate in human body communications. The apparatus includes a header generator, a data generator, a spreader, and a multiplexer. The header generator generates header information including a data rate. The data generator generates transmission data by repeating each data bit to be transmitted 0 to several times according to the data rate. The spreader spreads the transmission data using a spreading code in a desired frequency band. The multiplexer multiplexes the header information and the spread data. | 07-08-2010 |
20100172395 | MULTI-CARRIER TRANSMITTER DESIGN ON ADJACENT CARRIERS IN A SINGLE FREQUENCY BAND ON THE UPLINK IN W-CDMA/HSPA - Systems and methodologies are described that facilitate synthesizing a single baseband waveform from digital signals related to multiple carriers. Digital signals can be received relating to a plurality of carriers. The digital signals can result from spreading data symbols from transport blocks to create chip sequences, which can additionally be pulse shaped. The digital signals can be rotated in a positive or negative direction, such as according to a complex sinusoid or a negative representation thereof. The rotated signals can be combined or added to generate a single baseband waveform. The single baseband waveform can be converted to an analog signal, which can be up-converted and centered at a plurality of frequency carriers, which can be adjacent, assigned for transmitting the signal. In addition, optimizations can be provided to ensure threshold power ratio over the plurality of carriers for effectively transmitting jointly encoded signals. | 07-08-2010 |
20100183051 | Transmitter Apparatus with Adaptive Power and Phase for CDMA Applications - A spread spectrum cellular network (FIG. | 07-22-2010 |
20100183052 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING SIGNAL IN MULTI-ANTENNA COMMUNICATION SYSTEM - Provided is a method and apparatus for transmitting and receiving a signal in a multi-antenna communication system. A method of transmitting a signal via a multipath channel in the multi-antenna communication system may include: generating continuous orthogonal spreading codes; spread-modulating a user signal using the continuous orthogonal spreading codes to generate a spread signal; performing pre-rake combining of the spread signal to generate a pre-rake synthesized signal; and transmitting the pre-rake synthesized signal via multiple antennas. | 07-22-2010 |
20100208772 | ASYMMETRICAL FORWARD/REVERSE TRANSMISSION BANDWIDTH - A wireless communications system employs code-division multiple access information transmission techniques where the uplink and downlink transmission bandwidths are unequal. The higher bandwidth is an integer multiple of the lower bandwidth. The present system requires a base station and a subscriber unit to have two pseudo-random code generators which can be clocked separately. Alignment of the uplink and downlink pseudo-random spreading codes is achieved by truncating the code sequence for the lower speed link at the conclusion of a complete code sequence for the higher speed link. | 08-19-2010 |
20100215079 | Method and communication system device for the generation or processing of OFDM symbols in a transmission system with spread user data - OFDM symbols are generated using data from one or more users or from one or more data sources represented on a number of sub-carriers. To inhibit multiple-access interference on application of the CDMA principle, the data are transformed in a data-source specific manner and only subsequently allocated to the sub-carriers, independently of the transformation. | 08-26-2010 |
20100215080 | RADIO COMMUNICATION METHOD, RADIO COMMUNICATION SYSTEM, AND RADIO TRANSMISSION APPARATUS - A transmission apparatus according to the present invention includes: an encoding section; a modulation section; a variable-SF spreading section that performs spreading with variable SF according to control information A from a control section; an IDFT section that performs IDFT on output from the spreading section; a GI inserting section; a parallel/serial conversion section that converts output from the GI inserting section into a serial data sequence; a digital/analog conversion section; and an RF section that transmits a signal from an antenna after converting the signal to a frequency band for analog signal transmission and controlling it to an appropriate transmission power. The control section is configured to generate control information A for determining the variable SF and input the information A to the variable-SF spreading section and the RF section. In control information A, SF is varied depending on transmission power required. | 08-26-2010 |
20100238978 | METHODS FOR TRANSMITTING AND RECEIVING A MULTICARRIER SPREAD-SPECTRUM SIGNAL, CORRESPONDING SIGNAL, COMPUTER PROGRAM PRODUCTS AND TRANSMISSION AND RECEPTION DEVICES - A method and apparatus are provided for transmitting a multicarrier spread-spectrum signal formed by a temporal succession of multicarrier symbols, using OQAM modulation and a plurality of inter-orthogonal spreading codes. The method includes spreading at least one complex-value data symbol, representative of a source data signal to be transmitted, over a set of sub-carriers of at least one multicarrier symbol, each of the sub-carriers modulating a complex value. | 09-23-2010 |
20100238979 | METHOD FOR TRANSMITTING SIGNALS FOR INTERFERENCE RANDOMIZATION - A method for transmitting signals for interference randomization is disclosed. The method for transmitting signals includes spreading the transmission signals using a plurality of orthogonal codes and transmitting the transmission signals spread by the plurality of orthogonal codes by a spatial frequency block coding (SFBC) or spatial time block coding (STBC) scheme. Among the plurality of orthogonal codes, codes of which mutual interferences are equal to or greater than a predetermined threshold are grouped to the same group, and orthogonal codes belonging to different groups are used for the spreading of the signals which are transmitted at the same timing. Accordingly, it is possible to realize interference randomization. | 09-23-2010 |
20100246641 | TIME-FREQUENCY CODE SPREADING METHOD AND APPARATUS IN OFDMA SYSTEM - The present invention provides a time-frequency code spreading method in an OFDMA system. The method includes: converting a transmission message into one or more modulating signal vectors, and each bit of the transmission message is spread onto all vector elements of a modulating signal vector; mapping one or more modulating signal vectors to a set of time-frequency grids, wherein in an OFDMA time-frequency plane, two time-frequency grids to which any two vector elements in each modulating signal vector are mapped do not have the same frequency location or time location. In addition, the present invention also provides a time-frequency code spreading apparatus in an OFDMA system. | 09-30-2010 |
20100246642 | MULTI-ACCESS HYBRID OFDM-CDMA SYSTEM - In one aspect of a multiple-access OFDM-CDMA system, the data spreading is performed in the frequency domain by spreading each data stream with a respective spreading code selected from a set of available spreading codes. To support multiple access, system resources may be allocated and de-allocated to users (e.g., spreading codes may be assigned to users as needed, and transmit power may be allocated to users). Variable rate data for each user may be supported via a combination of spreading adjustment and transmit power scaling. Interference control techniques are also provided to improve system performance via power control of the downlink and/or uplink transmissions to achieve the desired level of performance while minimizing interference. A pilot may be transmitted by each transmitter unit to assist the receiver units perform acquisition, timing synchronization, carrier recovery, handoff, channel estimation, coherent data demodulation, and so on. | 09-30-2010 |
20100260235 | PILOT TRANSMISSION METHOD, MIMO TRANSMISSION DEVICE, MIMO RECEPTION DEVICE WHICH PERFORMS COMMUNICATION WITH MIMO TRANSMISSION DEVICE - It is possible to provide a novel pilot transmission method which can calculate an accurate channel estimation value, a MIMO transmission device using the pilot transmission method, and a MIMO reception device which performs communication with the MIMO transmission device. The MIMO transmission device ( | 10-14-2010 |
20100260236 | PHY LAYER PPDU CONSTRUCTION FOR BODY AREA NETWORK (BAN) DEVICES - In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to construct a physical-layer service data unit (PSDU) based on a concatenate block, an insert shortened bits block, a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoder, a remove shortened bits block, an add pad bits block, a spreader, a bit interleaver, a scrambler, and a symbol mapper. | 10-14-2010 |
20100272157 | SPREAD SPECTRUM ENCODING AND DECODING - Certain aspects of the present disclosure relate to a method for generating spread-spectrum coded signals for transmission in a wireless communication system, and for efficient despreading at a receiver. | 10-28-2010 |
20100272158 | SPREAD-SPECTRUM CODS GENERATION - Certain aspects of the present disclosure relate to a method for generating Golay codes and generalized Golay codes in a wireless communication system, and for efficient spreading at a transmitter and despreading at a receiver. | 10-28-2010 |
20100272159 | FREQUENCY SELECTIVE DIGITAL TRANSMISSION APPARATUS - A frequency selective digital transmission apparatus includes: a preamble transmission processing unit generating a preamble for frame synchronization and spreading the generated preamble with a predetermined spreading code; a header transmission processing unit configuring a header including data attribute information and spreading the header with a predetermined spreading code; a data transmission processing unit performing serial-to-parallel conversion on transmission data according to a selected transmission mode and a spreading scheme and spreading the same with a frequency selective spreading code; and a multiplexing unit multiplexing the preamble, the header, and the data which have been spread by the preamble transmission processing unit, the header transmission processing unit and the data transmission processing unit, respectively, and transmitting the same as digital signals. | 10-28-2010 |
20100284440 | Time-Multiplexed Binary Offset Carrier Signaling and Processing - Methods and systems for direct sequence spread spectrum (DSSS) signals are described herein. In an embodiment, a DSSS signal includes a time multiplexed spreading time series. The time multiplexed spreading time series includes a data spreading time series includes at least a first spreading symbol, and a pilot spreading time series includes at least a second spreading symbol and a third spreading symbol. The second spreading symbol and the third spreading symbol are different. | 11-11-2010 |
20100309957 | CONTINUOUS TIME CHAOS DITHERING - Embodiments of the present invention provide a system and method for further reducing cyclostationarity and correspondingly energy density in a chaotic spread spectrum data communication channel, by digitally generating a first chaotic sequence of values to form a spreading code. The spreading code is then used to form a digital IF spread spectrum signal having a uniform sampling interval. The digital IF spread spectrum signal is converted to a sampled analog IF spread spectrum signal at a conversion rate substantially equal to the uniform sampling interval. The duration of the sampling interval is then selectively varied in accordance with a first pseudo-random sequence, thereby introducing a known dither in the analog IF spread spectrum signal. After introducing the known dither, the analog IF spread spectrum signal is upconverted to an analog RF spread spectrum signal. The first pseudo-random sequences may be designed to be a chaotic sequence. | 12-09-2010 |
20100309958 | METHOD AND APPARATUS FOR CONTINUOUS PHASE MODULATION PREAMBLE ENCODING AND DECODING - Certain aspects of the present disclosure relate to a method for generating single carrier signals with spread-spectrum coded preambles using constant envelope 2-CPM modulation for transmission in a wireless communication system, and for efficient despreading method at a receiver. | 12-09-2010 |
20100322289 | CONSTANT AMPLITUDE ENCODING APPARATUS AND METHOD FOR CODE DIVISION MULTIPLEXING COMMUNICATION SYSTEM - Disclosed are an apparatus and method for constant amplitude encoding of a transmission signal in a CDM (Code Division Multiplexing) communication system. The apparatus for constant amplitude encoding of a transmission signal includes: an encoding module sequentially performing horizontal encoding and vertical encoding on an input signal; and a spreading and multiplexing module spreading the signal which has been encoded by the encoding module and multiplexing the spread signal in a vertical direction to output a data stream having a constant amplitude. | 12-23-2010 |
20100322290 | MODULATION AND DEMODULATION APPARATUS USING FREQUENCY SELECTIVE BASEBAND AND TRANSMISSION AND RECEPTION APPARATUS USING THE SAME - There is provided a communication method using a human body as a medium. A modulation apparatus using a frequency selective baseband according to an aspect of the invention may include: a serial-to-parallel conversion unit converting serial data supplied from an upper layer into parallel data consisting of M+1 number of data input bits; and a frequency selective spreader selecting one subgroup among a plurality of subgroups obtained by dividing 2 | 12-23-2010 |
20110013673 | UWB TRANSMITTER - An ultra-wideband (UWB) dual impulse transmitter is made up of a trigger edge selection circuit actuated by a single trigger input pulse; a first step recovery diode (SRD) based pulser connected to the trigger edge selection circuit to generate a first impulse output; and a second step recovery diode (SRD) based pulser connected to the trigger edge selection circuit in parallel to the first pulser to generate a second impulse output having a selected delay from the first impulse output. | 01-20-2011 |
20110019720 | METHOD, TRANSMITTER AND RECEIVER FOR SPREAD-SPECTRUM DIGITAL COMMUNICATION BY GOLAY COMPLEMENTARY SEQUENCE - The frequency spectrum of a transmitter system is spreaded in the transmitter ( | 01-27-2011 |
20110051783 | Phase-Optimized Constant Envelope Transmission (POCET) Method, Apparatus And System - An apparatus and method for generating a composite signal includes electronics configured to modulate a carrier utilizing a finite set of composite signal phases to generate a composite signal, the finite set of composite signal phases being determined through an optimization process that minimizes a constant envelope for the phase modulated carrier, subject to constraints on desired signal power levels of the signals to be combined and either zero or one or more relative phase relationships between the signals. The apparatus and method can be extended to generating an optimized composite signal of different frequencies. | 03-03-2011 |
20110064121 | METHODS AND APPARATUS FOR FLEXIBLE HOPPING IN A MULTIPLE-ACCESS COMMUNICATION NETWORK - Techniques for efficiently designing random hopping patterns in a communications system are disclosed. The disclosed embodiments provide for methods and systems for generating random hopping patterns, updating the patterns frequently, generating different patterns for different cells/sectors, and generating patterns of nearby sub-carriers for block hopping. | 03-17-2011 |
20110075709 | 3G and Wi-Fi Connected Mobile Systems - Method for receiving, demodulating and processing a Global Positioning System (GPS), a Code Division Multiple Access (CDMA) and an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal into a GPS, a CDMA and an OFDM processed baseband signal and providing processed signals to an interface unit of a mobile device. Further processing said received CDMA signal into a second OFDM processed signal and connecting said second OFDM processed signal to a modulator and transmitter for modulation and transmission. Processing an OFDM processed signal into a second CDMA processed signal, connecting and transmitting the second CDMA processed signal. Storing a received camera generated CDMA signal and processing it into a Time Division Multiple Access (TDMA) processed signal. Processing a touch screen generated signal into a touch screen generated control signal for control of a mobile device. Generating and processing a motion detector generated signal into a motion detector generated control signal for control of operation of one or more units of a mobile device. Method for receiving and processing a smoke detector generated signal and for providing processed smoke detector signal to a transmitter for transmission. | 03-31-2011 |
20110075710 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING BROADCASTING-COMMUNICATION DATA - A method and apparatus for transmitting/receiving broadcasting-communication data is provided. The apparatus includes: an original signal generator configured to receive the original data and generate baseband original signals; a first modulator configured to receive the baseband additional signals and generate original signals of a predetermined band; an additional signal generator configured to receive the additional data and generate baseband additional signals; a second modulator configured to receive the baseband additional signals and generate additional signals of a predetermined band; an average power controller configured to control an average power of the additional signals of the predetermined band; an inserter configured to insert the additional signals of the predetermined band with a controlled average power to the original signals of the predetermined band to thereby generate mixed signals of a predetermined band; and a transmitter configured to transmit the mixed signals of the predetermined band. | 03-31-2011 |
20110122925 | Method for Selecting Transmission Signal Power Level and Transmitter Device Implementing Same - Disclosed is a method for generating a pulsed transmission signal. The method includes the steps of generating a plurality of transmission bursts by encoding data with a predetermined spreading code, each of the bursts including a train of pulses defining a burst length of the burst; and sizing the transmission bursts to a peak power level within a predetermined limit, thereby forming the transmission signal. The sizing of the transmission bursts includes the step of modifying the amplitude of the pulses of the burst on the basis of a predetermined relationship between the burst length and the peak/average transmission power level. Also disclosed is a transmitter device implementing the method. | 05-26-2011 |
20110122926 | APPARATUS AND METHOD FOR GENERATING PSEUDO NOISE CODE - An apparatus and method of generating a pseudo noise (PN) code is provided. The apparatus for generating the PN code includes: a memory device unit including a plurality of memory devices; an exclusive-OR (XOR) operation unit receiving output values of at least two memory devices among output values of the plurality of memory devices to output an XOR operation value with respect to the received output values; and a PN code generation unit generating the PN code based on an output value of the XOR operation unit. | 05-26-2011 |
20110134966 | NOVEL PULSE GENERATOR FOR ULTRA-WIDE-BAND MODULATING SYSTEMS AND MODULATING SYSTEMS USING IT - A pulse generator circuit is provided. The pulse generator circuit has an input adapted to receive an input electrical quantity and an output at which an output electrical quantity is made available. A transfer characteristic establishes a relationship between said input and said output electrical quantities. The pulse generator circuit is adapted to provide said output electrical quantity in the form of pulses having a predetermined shape, suitable to be used for UWB transmission. The transfer characteristic has substantially a same shape as that of said pulses. Moreover, a UWB modulating system exploiting the novel pulse generator is proposed. | 06-09-2011 |
20110134967 | SYNCHRONIZED BROADCAST/MULTICAST COMMUNICATION - Synchronized broadcast transmits a same broadcast content using a same waveform from multiple transmitters. Transmitters each apply a same spreading code for broadcast transmissions. In a spread-spectrum communication system having a time division multiplexed forward link, a synchronized broadcast transmission is inserted into a broadcast slot. One embodiment employs an Orthogonal Frequency Divisional Multiplex (OFDM) waveform for the synchronized broadcast. An OFDM receiver is then used to process the received synchronized broadcast transmission. An alternate embodiment implements a broadcast Pseudo-random Noise (PN) code for use by multiple transmitters. An equalizer is then employed to estimate the synchronized broadcast transmission. | 06-09-2011 |
20110134968 | METHOD AND APPARATUS FOR INFORMATION TRANSMISSION IN A RADIO COMMUNICATION SYSTEM - The present invention relates to a method and an apparatus for information transmission in a radio communication system. The method includes the steps of creating a first symbol and a second symbol relevant to information, creating a first transmission vector and a second transmission vector on the basis of Alamouti code from the first symbol and the second symbol, and transmitting the first transmission vector via a first antenna and transmitting the second transmission vector via a second antenna. | 06-09-2011 |
20110170575 | Transmit Diversity Using Low Code Rate Spatial Multiplexing - A system is provided for transmitting a low code rate spatially multiplexed channel on multiple antennas. The system includes a transmitter and a processor. The processor is configured such that the processor encodes a block of information bits to form channel coded bits, wherein the ratio of the number of channel coded bits to the number of information bits is greater than one; and the processor maps the channel coded bits to modulation symbols, and each channel coded bit is mapped once to a modulation symbol. The transmitter is configured to transmit a first portion of the modulation symbols using a spreading sequence on a first antenna of the multiple antennas and to transmit a second portion of the modulation symbols using the spreading sequence on a second antenna of the multiple antennas. | 07-14-2011 |
20110176581 | METHOD AND APPARATUS FOR PILOT SIGNAL PROCESSING IN A WIRELESS COMMUNICATION SYSTEM - A wireless communication system is provided that spreads pilot signals, or channel state information reference signals (CSI-RSs), using a spreading code chosen from a set of mutually unbiased bases (MUBs). The advantages of such spreading with MUBs are that multiple base stations can send their pilot signals on a same time-frequency resources, making the pilot signal design very efficient and also improving channel estimation at a user equipment through orthogonal and quasi-orthogonal spreading which gives a gain above noise and interference. A short spreading code chosen from MUBs may be used for spreading pilot signals transmitted from each antenna of a base station within a time-frequency resource comprising multiple closely-spaced subcarriers in frequency and/or multiple closely-spaced symbols in time. | 07-21-2011 |
20110182328 | RADIO COMMUNICATION DEVICE AND RESPONSE SIGNAL DIFFUSION METHOD - Provided is a radio communication device which can surely prevent inter-code interference while maintaining the use efficiency of an upstream line control channel and suppress separation characteristic of a response signal. The device includes: a control unit ( | 07-28-2011 |
20110188546 | WIRELESS TRANSMIT/RECEIVE UNIT (WTRU) FOR CARRIER OFFSET RECOVERY - A wireless transmit/receive unit (WTRU) for carrier offset recovery. An adaptive matched filter produces a filtered signal. A rake receiver provides relative path values of multipath components. A mixer generates channel impulse response estimates. A channel despreader despreads the filtered signal using the pseudo-noise signal generated to produce a despread channel signal of the selected channel. A pilot channel despreader despreads the filtered signal using a pseudo-noise signal generator to produce a despread pilot signal of the pilot channel. A hard decision processor determines a symbol value of the despread channel signal. A complex conjugate processor generates a complex conjugate of the symbol value as a correction signal. A phase-locked loop produces a phase correction signal to recover carrier offset. | 08-04-2011 |
20110211616 | METHODS AND APPARATUSES FOR BEACON TRANSMISSION - Various methods and apparatuses for beacon transmission in an ad-hoc peer-to-peer network are disclosed. In one aspect, an apparatus for communication is disclosed, the apparatus comprising a processing system configured to determine device-independent beacon data, determine device-dependent beacon data, and to spread the device-dependent beacon data using one or more spreading codes anda transmitter configured to transmit one or more beacons during a beacon transmission period, wherein each beacon comprises the device-independent beacon data and the spread device-dependent beacon data. | 09-01-2011 |
20110211617 | METHODS AND APPARATUS FOR SIGNAL TRANSMISSION AND RECEPTION IN A BROADBAND COMMUNICATION SYSTEM - In a broadband wireless communication system, a spread spectrum signal is intentionally overlapped with an OFDM signal, in a time domain, a frequency domain, or both. The OFDM signal, which inherently has a high spectral efficiency, is used for carrying broadband data or control information. The spread spectrum signal, which is designed to have a high spread gain for overcoming severe interference, is used for facilitating system functions such as initial random access, channel probing, or short messaging. Methods and techniques are devised to ensure that the mutual interference between the overlapped signals is minimized to have insignificant impact on either signal and that both signals are detectable with expected performance by a receiver. | 09-01-2011 |
20110216810 | Increased capacity communication links with spectrum sharing - Various embodiments are directed to systems and methods for processing signals comprising a first component and a second component. A bandwidth of the first component may be centered at a center frequency. A bandwidth of the second component may be offset from the center frequency by an offset frequency such that at least a portion of the bandwidth of the second component overlaps a skirt of the first component. In various embodiments, a transmitter may split a single signal to generate the first and second components, shift the frequency of the second component, recombine and transmit the two components. Also, in various embodiments, a receiver may receive the signal and derive the first and second components by correcting for cross-interference. | 09-08-2011 |
20110228818 | SIGNAL GENERATING APPARATUS, TRANSMISSION APPARATUS, SIGNAL GENERATING METHOD, TRANSMISSION METHOD, AND COMMUNICATION SYSTEM - A signal generating apparatus includes a spreading device that respectively spreads data using spreading code that is based on an initial phase; a multiplexing unit that code multiplexes the data spread by the spreading device; a calculating unit that calculates a peak of a signal resulting from code multiplexing by the multiplexing unit; a changing unit that changes the initial phase of the spreading device in a predetermined order; a determining unit that each time the initial phase is changed by the changing unit, determines whether the peak calculated by the calculating unit is at most a threshold; and a transmission control unit that outputs the signal, if the determining unit determines that the peak is less than or equal to the threshold. | 09-22-2011 |
20110228819 | METHOD AND APPARATUS FOR SWITCHING OPERATING MODES OF A RECEIVER - In a wireless communication system, a method and apparatus switches operating modes of a receiver receiving data and operating in a first mode. The method comprises determining whether a criteria is met to switch the operating mode of the receiver. The operating mode of the receiver is switched from the first mode to a second mode if the criteria is met. | 09-22-2011 |
20110243197 | TWO-DIMENSIONAL CODE SPREADING FOR INTERLEAVED FDMA SYSTEM - A transmitter comprises a first spreading unit configured to multiply each of multiple data symbols with a first spreading code sequence of a first spreading factor; a compression and repetition unit configured to compress output signals of the first spreading unit in time domain and repeat the compressed signal L times (where L is a natural number greater than or equal to 2); a phase modulation unit configured to multiply the compressed and repeated signal with a user dependent phase and output a data block consisting of L sub-blocks; a second spreading unit configured to replicate the data block according to a second spreading factor and multiply each set of the replicated sub-blocks with a second spreading code sequence of the second spreading factor to produce a two-dimensionally spread signal; and a wireless transmission unit configured to transmit the two-dimensionally spread signal using a single-carrier transmission scheme. | 10-06-2011 |
20110243198 | TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM - The present invention provides for transmitting a spread signal in a mobile communication system. The present invention includes spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set. | 10-06-2011 |
20110249706 | EMBEDDED META-CARRIER WITH SPREAD SPECTRUM VIA OVERLAID CARRIERS - A communication method for embedding a meta-carrier under an original carrier signal with reduced or minimal original carrier signal degradation, the method comprising transmitting an original carrier signal and transmitting a meta-carrier signal separate from the original carrier signal, wherein the meta-carrier signal contains information about an original carrier signal, is extractable under an interfered condition, and is transmitted such that the meta-carrier signal occupies at least a portion of a bandwidth of the original carrier signal. | 10-13-2011 |
20110249707 | RADIO COMMUNICATION APPARATUS AND REFERENCE SIGNAL GENERATING METHOD - A wireless communication apparatus capable of minimizing the degradation in separation characteristic of a code multiplexed response signal. In this apparatus, a control part ( | 10-13-2011 |
20110255572 | ESTIMATING FREQUENCY-OFFSETS AND MULTI-ANTENNA CHANNELS IN MIMO OFDM SYSTEMS - Techniques are described for carrier frequency offset (CFO) and channel estimation of orthogonal frequency division multiplexing (OFDM) transmissions over multiple-input multiple-output (MIMO) frequency-selective fading channels. A wireless transmitter forms blocks of symbols by inserting training symbols within two or more blocks of information-bearing symbols. The transmitter applies a hopping code to each of the blocks of symbols to insert a null subcarrier at a different position within each of the blocks of symbols, and a modulator outputs a wireless signal in accordance with the blocks of symbols. A receiver receives the wireless signal and estimates the CFO, and outputs a stream of estimated symbols based on the estimated CFO. | 10-20-2011 |
20110268159 | METHOD FOR LOCATING SATELLITES USING DIRECTIONAL FINDING - An improved method is provided for positioning a directional antenna coupled to a radio towards a satellite. The method includes: receiving an input to the radio from an operator of the radio, where the input indicates a desired time period for positioning the antenna; transmitting, during the desired time period, a plurality of burst data transmissions from the radio over a channel associated with the satellite; receiving a plurality of reply data transmissions from the satellite which correspond to the plurality of burst data transmissions sent by the radio; determining a metric indicative of signal quality for each of the reply data transmissions; and outputting from the radio an indicator for each metric. The operator of the radio can use the indicator output by the radio to better position the antenna towards the satellite. | 11-03-2011 |
20110268160 | TRANSMISSION TIMING CONTROL SYSTEM AND METHOD, AND MOBILE STATION FOR USE THEREIN - It is an object of the present invention to hold the detecting range of a timing correlator in a base station to the minimum required and to reduce the circuit scale and power requirement of the timing correlator. Before a mobile station transmits a data signal, it transmits a signal referred to as a preamble signal to measure the transmission timing to the base station. If the base station detects the preamble signal with a timing correlator having a limited circuit scale, then the base station transmits a transmission permission signal to the mobile station. If the mobile station fails to receive the transmission permission signal over a given period of time after it has transmitted the preamble signal, then the mobile station retransmits the preamble signal at a changed transmission timing based on the received electric power of a control signal transmitted continuously from the base station and information included in the control signal. The mobile station repeatedly retransmits the preamble signal until it receives the transmission permission signal. If the mobile station receives the transmission permission signal from the base station, then the mobile station transmits a data signal at the transmission timing of the preamble signal transmitted immediately prior to the reception of the transmission permission signal. | 11-03-2011 |
20110274143 | SPREAD SPECTRUM CLOCK SIGNAL GENERATOR METHOD AND SYSTEM - A system and method for generating a spread spectrum clock signal with a constant ppm offset as a function of a repetition number. A phase interpolator can be configured in association with of a phase-locked loop circuit in order to provide a phase movement from a bit clock generated by the PLL circuit. A repetition number divider computes the repetition number for each time slot in a piece-wise SSC modulation profile. A noise shaping modulator can be employed for modulating a fractional part associated with the repetition number. A repetition counter and a phase accumulator receives an integer part of the repetition number and counts unit interval clock periods equal to a sum of integer and the sigma-delta modulated fractional parts of the repetition number. The phase accumulator can be incremented and/or decremented based on the sign of the spread spectrum direction. | 11-10-2011 |
20110280285 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN A COMMUNICATION SYSTEM - An apparatus and a method for transmitting/receiving data generate main service data of broadcasting data, generate additional data of the broadcasting data, transform the additional data into a parallel type, generate pseudo-random noise sequences as a spreading code of the additional data, select polarities of the pseudo-random noise sequences using any one additional data bits in the additional data in the transformed parallel type, map the remaining additional data bits excluding the one additional data bit from the additional data in the transformed parallel type to a single sequence, multiply a single sequence to which the remaining additional data bits are mapped by pseudo-noise sequences of which the polarities are selected, control mean power of the additional data multiplied by the sequences, couple the additional data of which the mean power is controlled with the main service data, and then, transmit the broadcasting data. | 11-17-2011 |
20110310934 | SPREAD SPECTRUM COMMUNICATION SYSTEM, CLEAR CHANNEL ASSESSMENT DEVICE AND RELATED METHOD - A spread spectrum communication system includes a first and a second antenna, a first and a second radio frequency demodulator, a first and a second analog-to-digital converter, a first and a second filter, a clear channel assessment device, and a selection device. The radio frequency demodulators convert radio frequency signals to baseband signals, respectively. The analog-to-digital converters convert baseband signals to digital signals, respectively. The filters filter the first and second digital signals to generate filtered signals, respectively. The clear channel assessment device generates a channel assessment signal and a path selection signal according to signal characteristics of the filtered signals. The selection device refers to at least one of the channel assessment signal and path selection signal to selectively output one of the filtered signals, or generate no signal output. | 12-22-2011 |
20120008663 | OFDM Synchronization and Signal Channel Estimation - OFDM synchronization and signal channel estimation is accomplished by adding pilot signals to the outputs of OFDM encoders, i.e. after encoding of data/symbols, in a spread spectrum wireless communication system utilizing uniquely designed OFDM transmitters, OFDM receivers and OFDM systems and methods. | 01-12-2012 |
20120027050 | METHOD AND DEVICE FOR GENERATING ULTRA WIDE BAND PULSES - The disclosure relates to a method for generating UWB waveforms, each comprising a sequence of pulses, the method comprising: generating consecutive elementary pulses having durations corresponding to setpoint durations and a constant amplitude, amplifying each elementary pulse separately as a function of a respective setpoint amplitude, and combining the amplified elementary pulses to obtain a waveform successively comprising each of the amplified alternately positive and negative, elementary pulses. | 02-02-2012 |
20120027051 | High data rate transmitter and receiver - A high-speed transmitter and receiver are provided. In one embodiment, a transmitter comprises a baseband processor structured to receive data and to convert the data into a multiplicity of high and low signal values, with each high and low signal value having a first timing interval. A local oscillator generates a clock signal at a second timing interval and a digital circuit combines the high and low signal values with the clock signal to produce a transmission signal directly at a transmission frequency. A receiver is configured to receive the signal. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims. | 02-02-2012 |
20120069871 | Temperature Compensation in a Telecommunications Device - A communications device, such as a GNSS receiver comprises an oscillator, having a temperature-dependent frequency characteristic, for generating signals at a nominal frequency; receiver circuitry, for receiving transmitted wireless signals using the signals generated by the oscillator; at least one temperature sensor, having a known positional relationship to the oscillator; an estimation device, for estimating a frequency of the signals generated by the oscillator, based on a measurement from the temperature sensor, and based on the temperature-dependent frequency characteristic of the oscillator; and at least one heat source. A change in the temperature of the oscillator is predicted, based on a state of the heat source, and further based on a model of the thermal properties of the communications device, and hence a change in the frequency of the signals generated by the oscillator is predicted, based on the temperature-dependent frequency characteristic of the oscillator. The receiver circuitry uses the estimated frequency of the signals generated by the oscillator, and the predicted change in the frequency of the signals generated by the oscillator, in receiving the transmitted wireless signals. | 03-22-2012 |
20120076176 | ELECTRONIC DEVICE AND METHOD FOR SPREAD SPECTRUM CLOCK (SSC) MODULATION - The invention relates to an electronic device that includes a plurality of buffers and a phase locked loop. For each buffer a fractional divider is provided which is coupled to receive the output from the phase locked loop and configured to feed a divided output signal to a respective buffer. A spread spectrum clock control logic stage in the spread spectrum clock (SSC) is provided which is configured to individually adjust a value of the division of each fractional divider in order to individually and independently modulate the output signal of each fractional divider according to a spread spectrum modulation scheme. | 03-29-2012 |
20120087394 | METHODS AND SYSTEMS FOR OFDM USING CODE DIVISION MULTIPLEXING - In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions. | 04-12-2012 |
20120106595 | METHOD AND APPARATUS FOR OPTIMIZING POWER DISTRIBUTION BETWEEN SYMBOLS - A method, an apparatus, and a computer program product for wireless communication are provided in which a first pre-coding matrix for use on a portion of a set of resource blocks (RBs) is determined. At least one beamforming vector of the set of beamforming vectors is modified by applying a phase rotation to generate a modified pre-coding matrix. The modified pre-coding matrix is applied to one or more demodulation reference signals and data associated with the portion of the set of RBs for transmission using at least one antenna. | 05-03-2012 |
20120106596 | ADAPTIVE PILOT STRUCTURE TO ASSIST CHANNEL ESTIMATION IN SPREAD SPECTRUM SYSTEMS - The present invention relates generally to methods for generating a dynamic pilot symbol structure in spread spectrum communication systems, and in particular to the use of pilot symbols by user equipment in channel estimation. In one form, the method includes, allocating basic pilot symbols at the beginning of each data chunk and spread over the plurality of sub-carrier frequencies; and selectively replacing data symbols in each data chunk with adaptive pilot symbols according to the speed of the user equipment. | 05-03-2012 |
20120114016 | Method for Processing Data - A method includes encoding data according to a space time transmit diversity scheme and spatial-multiplexing the encoded data. | 05-10-2012 |
20120114017 | Apparatus and Method for Modulating Data Message By Employing Orthogonal Variable Spreading Factor (OVSF) Codes in Mobile Communication System - A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal. | 05-10-2012 |
20120140795 | METHOD FOR WIRELESSLY TRANSMITTING DATA BETWEEN A PLURALITY OF COMMUNICATION UNITS ARRANGED IN A ROTATING COMPONENT AND ROTATING COMPONENT - A method for the wireless transmission of data between at least one communication unit ( | 06-07-2012 |
20120189036 | SYSTEMS FOR THE MULTICARRIER TRANSMISSION OF DIGITAL DATA AND TRANSMISSION METHODS USING SUCH SYSTEMS - A system includes at least a transmitter having a serial-to-parallel converter, an iFFT block and a frequency de-spreader device that applies each signal that results from multiplying a data sample by one of the predetermined frequency coefficients of the prototype filter of a synthesis filter bank to one of the inputs of the iFFT block presenting a size that is strictly greater than the number of subchannels. Also described is a system including at least one receiver including a serial-to-parallel converter, a FFT block presenting a size that is strictly greater than the number of subchannels of the system, and a frequency de-spreader device that multiplies the signal from each output of the FFT block by one of predetermined frequency coefficients of the prototype filter of an analysis filter bank and sums the results of these multiplications to deliver at least a portion of the output signal from the receiver. | 07-26-2012 |
20120195348 | Signal transmission apparatus, electronic instrument, reference signal outputting apparatus, communication apparatus, reference signal reception apparatus and signal transmission method - A signal transmission apparatus includes: a reference signal outputting section adapted to output a reference signal; a first clock production section adapted to produce, based on the reference signal, a first clock signal for a first signal process regarding a radio communication process of a spectrum spreading method in synchronism with the reference signal; a first signal processing section adapted to carry out the first signal process based on the first clock signal; a second clock production section adapted to produce, based on the reference signal, a second clock signal for a second signal process corresponding to the first signal process in synchronism with the reference signal; and a second signal processing section adapted to carry out the second signal process based on the second clock signal. | 08-02-2012 |
20120195349 | SPREAD-SPECTRUM CODING OF DATA BURSTS - Certain aspects of the present disclosure relate to a method for generating spread-spectrum coded signals for transmission in a wireless communication system, and particularly for generating spread sequences of data with spreading codes that facilitate computationally efficient frequency-domain processing at a receiver. | 08-02-2012 |
20120219038 | Embedded Meta-Carrier with Code Progression Message Reassembly - A method of embedding and transmitting a meta-data message in an original burst carrier signal for message reassembly comprising spreading a meta-carrier signal using a Direct Sequence Spread Spectrum (DSSS) spreading code having a Pseudo-Random Noise (PRN) spreading code sequence, the meta-carrier signal comprising one or more bits of meta-data information about the original burst carrier signal, lowering a power spectral density of the meta-carrier signal using the PRN spreading code such that interference with the original signal is reduced, combining the original burst carrier and the meta-carrier signals using a modulator such that a composite burst carrier signal results wherein the meta-carrier signal occupies at least a portion of a bandwidth of the original carrier, and transmitting the composite burst carrier using a transmitter over a telecommunications channel in which only one burst carrier signal is expected to be present within a predetermined frequency bandwidth at a point in time. | 08-30-2012 |
20120236908 | METHOD AND DEVICE FOR ESTIMATING RATIO OF AVERAGE CHIP ENERGY TO TOTAL TRANSMIT POWER SPECTRUM DENSITY - The present invention provides a method for estimating a ratio of average chip energy to a total transmit power spectrum density (Ec/Ior), including: according to a group of spreading codes corresponding to an acquired spreading factor, obtaining an estimated value of Ior; according to a spreading code of a physical channel to be estimated, obtaining an estimated value of Ec; and according to the estimated value of the Ior and the estimated value of the Ec, obtaining an estimated value of EC/Ior. The present invention further provides a device for estimating Ec/Ior. By adopting the method and device for estimating Ec/Ior, when a base station adjusts transmit power of each physical channel, an adjusted value of Ec/Ior can be obtained in real time for accurate estimation. | 09-20-2012 |
20120236909 | PILOT SENDING METHOD AND APPARATUS - Embodiments of the present invention provide a pilot sending method and an apparatus, which relate to the communication field and can save network resources. The solution is: performing spreading on at least two signature sequences by using a spreading code, where each signature sequence of the at least two signature sequences corresponds to at least one user equipment (UE), and is used as a dedicated pilot of at least one data stream of the at least one UE, and the dedicated pilot is used by the UE to perform precoding matrix estimation; and performing precoding on the spread signature sequences, and sending the precoded spread signature sequences to the UE. The embodiments of the present invention are applicable to the sending of pilots in MU-MIMO. | 09-20-2012 |
20120250730 | INTEGRATED CIRCUIT FOR RESPONSE SIGNAL SPREADING - A wireless communication apparatus capable of minimizing the degradation of the separation characteristic of response signals to be code-multiplexed. In the apparatus, a control part ( | 10-04-2012 |
20120287966 | Code Generating Apparatus, Reference Signal Generating Apparatus, and Methods thereof - A demodulation reference signal generator includes a non-correlation sequence generator to generate a non-correlation sequence for RS of a first resource block; a first spectrum spreading unit to spread spectrums of elements in the non-correlation sequence for RS to be mapped to a first frequency resource of the first resource block, by using a first group of codes; a second spectrum spreading unit to spread spectrums of elements in the non-correlation sequence for RS to be mapped to a second frequency resource of the first resource block, using a second group of Codes; the first and second frequency resources are adjacent frequency resources used for RS transmission in the first resource block, and the first and second groups of Codes are mirrors in column to each other; and a mapping unit to map the spectrum-spread elements to the first and second frequency resources. | 11-15-2012 |
20120287967 | PLL CIRCUIT, COMMUNICATION DEVICE, AND LOOPBACK TEST METHOD OF COMMUNICATION DEVICE - A controlling unit disposed in a PLL circuit controls a phase interpolator to gradually change a phase shift amount applied to a phase shift signal C_PS by a unit of basic delay amount Δ at a timing predetermined in accordance with a modulation profile of an SSC. Further, the controlling unit controls a total phase shift amount applied to the phase shift signal C_PS output from the phase interpolator in one period of a feedback clock signal C_FB obtained by dividing frequency of the phase shift signal C_PS in a way that a difference between the total phase shift amount and a total phase shift amount in a previous one period of C_FB is always equal to or less than the basic delay amount Δ. | 11-15-2012 |
20120294334 | ULTRA-WIDE BAND COMMUNICATION APPARATUS AND METHOD - The present invention provides an ultra-wide band (UWB) system and method. In one embodiment, a transmitter of a low duty cycled ultra wide band (UWB) system includes a differential spreading encoder for encoding a phase of a bit sequence based on a reference bit sequence. The transmitter also includes a pulse generator for generating a number of pulses associated the bit sequence using the encoded phase of the bit sequence, where the number of pulses is equal to a length of the bit sequence. Moreover, the transmitter includes a DMPSK modulator for generating a modulated signal through modulating the number of pulses using a phase of a differential data symbol. | 11-22-2012 |
20130010836 | System and Method for Communicating Reference Signals - A method for communicating DM-RS symbols to support MIMO transmissions having five or more layers of spatial multiplexing. A first subframe is communicated carrying two leading symbols of a first length-4 OCC sequence and two leading symbols of a second length-4 OCC sequence, and a second subframe is communicated carrying two trailing symbols of the first length-4 OCC and two trailing symbols of the second length-4 OCC sequence. Optionally four length-2 OCCs can be carried in a similar manner or, alternatively, in different frequency bands or resource block pairs of a common subframe. | 01-10-2013 |
20130016760 | METHODS AND APPARATUSES FOR LOW-RATE TELEVISION WHITE SPACE (TVWS) ENABLEMENT - Certain aspects of the present disclosure relate to techniques for supporting television white space (TVWS) communication. In an aspect of the present disclosure, a low-rate TVWS enabler (Mode II wireless communication device) may provide initial enablement for all Mode I devices (e.g., access points and user terminals), as well as it may transmit a contact verification signal (CVS) on a regular basis to keep the Mode I devices enabled for the TVWS communication. | 01-17-2013 |
20130022086 | Transmitter with Modulation - A transmitter with modulation comprising a phase changing stage having a first switch and a second switch coupled t the first switch, a first transistor and a second transistor individually coupled to the each switch. The transmitter is configured to receive a phase changing signal having a first state and a second state. The first switch is configured t operate in an opposing manner to the second switch such that only the first transistor is configured to be turned on i the first state and only the second transistor is configured to be turned on in the second state upon receipt of the phase changing signal by the switches so as to achieve a change in an output phase of the transmitter when the phase changing signal switches from the first state to the second state. | 01-24-2013 |
20130034125 | METHOD AND APPARATUS FOR AMPLITUDE MODULATION OF SPREAD SIGNAL - Disclosed are a method and an apparatus for amplitude modulation of a spread signal that can increase a data transmission rate and frequency use efficiency by loading information on the amplitude of the spread signal used in digital communications. A method for amplitude modulation of a spread signal according to an exemplary embodiment of the present disclosure includes: receiving a first data signal; generating a spread signal by applying a spreading code to the first data signal; receiving a second data signal; and outputting the spread signal at an amplitude corresponding to a value of the second data signal. | 02-07-2013 |
20130034126 | RADIO COMMUNICATION DEVICE AND RESPONSE SIGNAL SPREADING METHOD - A radio communication device capable of randomizing both inter-cell interference and intra-cell interference. In this device, a spreading section primarily spreads a response signal in a ZAC sequence set by a control unit. A spreading section secondarily spreads the primarily spread response signal in a block-wise spreading code sequence set by the control unit. The control unit controls the cyclic shift amount of the ZAC sequence used for the primary spreading in the spreading section and the block-wise spreading code sequence used for the secondary spreading in the spreading section according to a set hopping pattern. The hopping pattern set by the control unit is made up of two hierarchies. An LB-based hopping pattern different for each cell is defined in the first hierarchy in order to randomize the inter-cell interference. A hopping pattern different for each mobile station is defined in the second hierarchy to randomize the intra-cell interference. | 02-07-2013 |
20130039388 | COMMUNICATION SYSTEMS AND METHODS - In accordance with embodiments, a communication system includes a first device and a second device in communication with the first device. The second device has at least a first pair and a second pair of antennas. The second device spreads a communication bit by a predetermined spreading factor and forms a first set of spatial block codes in frequency domain based on the spread communication bit. The first set of spatial block codes being consecutively transmitted on one of the first and second pairs of antennas. | 02-14-2013 |
20130044789 | METHOD AND APPARATUS FOR CONFIGURING LOW POWER NETWORK - A transmitter for Electric Field Communication (EFC) is provided. The transmitter includes a preamble code generator, a preamble symbol generator, and a transmission electrode. The preamble code generator masks each of at least two repetitive preamble codes so that information indicating broadcast information is included in the at least two repetitive preamble codes. The preamble symbol generator multiplies a spreading code to spread the masked at least two repetitive preamble codes and generate preamble symbols. The transmission electrode transmits the preamble symbols. Since additional information transferred based on the size of a correlation value of a preamble symbol is used, a broadcast frame can be retrieved even when all packets inside a superframe are not demodulated. | 02-21-2013 |
20130058379 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD IN WIRELESS POWER TRANSMISSION SYSTEM - An apparatus and method to perform communication in a wireless power transmission system are provided. When a communication channel is selected from channels excluding a channel used in wireless power transmission, a communication apparatus and method transmit, using a frequency of the communication channel, a channel seizure signal, an access standard instruction, and a state information signal indicating an operating mode of a source. When a response signal corresponding to the access standard instruction is received from a target, the communication apparatus and method determine a control identifier (ID) of the target. | 03-07-2013 |
20130058380 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD IN WIRELESS POWER TRANSMISSION SYSTEM - An apparatus and method for performing communication in a wireless power transmission system are provided. The apparatus includes a channel search unit configured to search for communication channels other than a channel used in wireless power transmission, and measure state information of the communication channels. The apparatus includes a channel determining unit configured to determine a communication channel available for communication with a target device based on the measured state information. The apparatus includes a communication unit configured to transmit an access instruction to the target device using the determined communication channel. The apparatus includes a controller configured to determine whether to communicate with the target device using the determined communication channel based on whether a response signal corresponding to the access instruction is received. | 03-07-2013 |
20130121381 | SPREAD-SPECTRUM PILOT SIGNALS IN A COMMUNICATIONS TRANSMITTER - Interference-reducing circuits include a feed-forward circuit for subtracting all or part of a desired transmitter-signal component from a signal coupled from the power amplifier's output path. The error signal from this feed-forward circuit contains a replica of distortion in the power amplifier output. A cancellation loop adjusts the phase and/or amplitude of this error signal and combines this adjusted error signal with an interference-carrying signal, removing some of the undesired distortion. A spread-spectrum pilot signal is used in one or both loops, to provide a reference signal that can be monitored by an adjustment circuit, which measures the magnitude and/or phase of a spread-spectrum signal that is injected into the interference-carrying signal and, based on that measurement, adjusts the amplitude, phase, and/or delay of the cancellation signal that is added to the interference-carrying signal. This yields a reduced-interference signal in which undesired distortion is reduced. | 05-16-2013 |
20130142220 | METHOD AND APPARATUS FOR COMPENSATING CODE CHANNEL POWER IN A TRANSMITTER - It has now been found that in some transmitter implementations which transmit multiple code channels, for example CDMA transmitters, the observed power for each code channel at the output relative to the other code channels is dependent upon the total transmit power due to non-linearities in the transmitter. Methods and apparatus are provided which use pre-set digital gains or digital gain adjustments to compensate for the non-linearities as a function of total transmit power such that at the output, the desired relative powers are observed. | 06-06-2013 |
20130148696 | SATELLITE BROADCASTING SYSTEM AND METHOD - Provided is a satellite broadcasting system and method using a spread spectrum technique to improve satellite broadcasting availability in a rainy environment and to provide a satellite broadcasting N-screen service. A satellite broadcasting transmitter of the satellite broadcasting system may encode a broadcast signal into each of a high definition (HD) signal, a standard definition (SD) signal, and a low definition (LD) signal, may modulate each of the encoded HD signal and the encoded SD signal by a predetermined modulation scheme, may spread a spectrum of the encoded LD signal to generate a spread spectrum signal, may to modulate the spread spectrum signal, may combine the modulated spread spectrum signal with the modulated HD signal and the modulated SD signal to generate a combined modulated signal, and may transmit the combined modulated signal to a satellite. | 06-13-2013 |
20130195148 | MODULATION AND DEMODULATION METHOD FOR SATELLITE COMMUNICATION USING WIDESPREAD SIGNAL-TO-NOISE RATIO (SNR) - Provided are a modulation method and a demodulation method for satellite communication using a widespread signal-to-noise ratio (SNR), the method including: adding a dummy frame to a broadcasting/communication signal frame for signal transmission of a digital video broadcasting-satellite second generation (DVB-S2) modulator; verifying a spreading factor; adding the same physical layer header to the broadcasting/communication signal frame to which the dummy frame is added, repeatedly the number of times corresponding to the verified spreading factor; and repeating the same data, for example, PL frame data as the physical layer header. | 08-01-2013 |
20130223482 | SYSTEM AND METHOD FOR INCREASING MAXIMUM PAYLOAD SIZE - A method and apparatus for increasing, at a transmitter, a payload size of a communication channel having orthogonal groups, the method referencing a base orthogonal sequence set comprising orthogonal sequences that are mutually orthogonal, the orthogonal sequence set having subsets that are sub-block orthogonal with a length of four; and selecting a spreading sequence set from a plurality of spreading sequence sets, each of the plurality of spreading sequence sets comprising an orthogonal sequence set subset combined with an imaginary orthogonal sequence set subset, wherein the selecting increases payload size. | 08-29-2013 |
20130230077 | COMMUNICATION SYSTEM, APPARATUS AND METHODS - A system, method and apparatus for wireless communications are provided. In an exemplary embodiment, frequency components present in a short duration modulated complex pulse is used to represent data to be sent. In other embodiments, the complex pulse is created, modulated, then modified to have desirable frequency characteristics. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims. | 09-05-2013 |
20130235908 | APPARATUS FOR GENERATING SPREADING SEQUENCES AND DETERMINING CORRELATION - A circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator includes an input configured to receive an input signal, a set of delay elements, including delay elements corresponding to respective delays of 1, 2, 4, 8, 16, 32, and 64, and a set of multipliers interconnected with the input and the set of delay elements. The set of multipliers is configured to apply weight factors, and the weight factors define the sequence 1,1,−1,1,−1,1,−1. The circuit also includes a pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers. | 09-12-2013 |
20130243042 | PHASED SPREADING SCHEME-BASED TRANSMISSION APPARATUS AND METHOD OF OPERATING THE SAME - There are provided a phased spreading scheme-based transmission apparatus and a method of operating the same. The phased spreading scheme-based transmission apparatus includes a spreading unit performing a first spreading operation of defining a first spreading code and spreading an input signal by using the defined first spreading code in response to a control signal defining a spreading coefficient, and a second spreading operation of selecting a second spreading code based on the control signal defining the spreading coefficient and spreading an input signal by using the selected second spreading code, the first and second spreading codes having different spreading coefficients. | 09-19-2013 |
20130243043 | TRANSMITTER AND RECEIVER FOR REDUCING POWER CONSUMPTION IN FM-UWB COMMUNICATION SYSTEM - A transmitter and a receiver for reducing power consumption in a frequency modulation-ultra-wideband (FM-UWB) communication system are provided. The transmitter includes a detector configured to generate a pulse signal when an edge of a digital signal is detected. The transmitter further includes a first modulator configured to modulate the digital signal into a first modulation signal based on a value of the digital signal. The transmitter further includes a second modulator configured to modulate the first modulation signal into a second modulation signal based on a frequency of the first modulation signal when the pulse signal is generated. | 09-19-2013 |
20130251004 | TRANSMISSION DEVICE, RECEPTION DEVICE, AND RADIO COMMUNICATION METHOD - A transmitting apparatus includes an OFDM modulator that generates a first modulation symbol by modulating a first information signal using a first modulation scheme, a signal point of the first modulated information signal being at a first position in an in-phase quadrature-phase plane. A second modulation symbol by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the modulated second information signal is arranged to a third position in the in-phase quadrature-phase plane, and an OFDM modulation signal including the first modulation symbol and the second modulation symbol, wherein the OFDM modulation signal comprises a plurality of subcarriers. | 09-26-2013 |
20130279542 | SPREADING CODE PRODUCING APPARATUS - This invention relates to spreading code producing apparatus, which comprises: two phase shifters for spreading code which receive bits for determining spreading codes and phase information and producing spreading codes; and multiplexers which receive two spreading codes produced said two phase shifters for spreading code, receive bits through separate way which defines outputting order of the received two spreading codes and produce spreading codes with same length as said received two spreading codes. Therefore, many information using few spreading codes can be transmitted so that data transmission rate can be raised. Furthermore, communication service with high speed can be performed among communication devices using human body communication etc. | 10-24-2013 |
20130279543 | NAVIGATION SIGNAL TRANSMITTING APPARATUS, LOCATION INFORMATION PROVIDING APPARATUS, METHOD FOR TRANSMITTING NAVIGATION SIGNAL, AND METHOD FOR PROVIDING LOCATION INFORMATION - A navigation signal transmitting apparatus and a location information providing apparatus are provided for reducing time of positioning with a positioning signal from an indoor positioning transmitter. When an information providing server recognizes a transmitter ID of a transmitter from a mobile phone, the server makes reference refers to database associated with the transmitter ID, and reads SVG map information associated with the ID (including information for displaying a map and information of a correspondence relation between the transmitter ID and the location of the transmitter on the map). When the server transmits data of the SVG map information to a base station, the base station wirelessly emits the data of the SVG map information. When the mobile phone detects arrival of the data, the mobile phone can obtain the location of the transmitter from the data in accordance with a browsing operation of a user of the phone. | 10-24-2013 |
20130279544 | APPLICATION OF SEQUENCE HOPPING AND ORTHOGONAL COVERING CODES TO UPLINK REFERENCE SIGNALS - Methods and User Equipment (UE) apparatuses are provided for transmitting Reference Signals (RSs). A method includes receiving a cell-specific sequence-hopping parameter; receiving a UE-specific sequence-hopping parameter; determining a reference signal sequence based on the UE-specific sequence-hopping parameter; and transmitting the reference signal based on the determined reference signal sequence. Sequence hopping does not apply to the reference signal sequence if the cell-specific sequence-hopping parameter indicates that the sequence hopping is enabled and the UE-specific sequence-hopping parameter indicates that the sequence hopping is disabled. | 10-24-2013 |
20130279545 | Systems, Methods and Transceivers or Wireless Communications Over Discontinguous Spectrum Segments - Methods of transmitting a plurality of communications signals over a plurality of discontiguous bandwidth segments in a frequency band include defining a plurality (N | 10-24-2013 |
20130279546 | MAINS-SYNCHRONOUS POWER-LINE COMMUNICATIONS SYSTEM AND METHOD - A transmitter transmits an outbound message signal via the power distribution system. The transmitter includes a spreader for spreading the spectrum of the communications signal before transmitting the outbound message signal. A receiver despreads the spectrum of the received digitized signal and digitally demodulates the received despread signal to generate the message. The transmitted signal is orthogonal to a source of interference on the power distribution system. | 10-24-2013 |
20130287065 | ULTRA-WIDE BAND FREQUENCY MODULATOR - An ultra-wide band frequency modulator is disclosed. The frequency modulator includes a direct modulation phase lock loop that receives a small component. The frequency modulator also includes a delay module that produces a plurality of delay lines. The frequency modulator further includes an edge selector that receives a large component and the plurality of delay lines. | 10-31-2013 |
20130308686 | Transmission and Detection in Multiple-Antenna Transmission Systems - An apparatus includes a transmit diversity encoder configured to use a block code of a length greater than one for encoding at least two consecutive symbols. A first symbol of the at least two consecutive symbols is dedicated to a first user and the second symbol of the at least two consecutive symbols is dedicated to a second user. | 11-21-2013 |
20130343432 | METHOD AND APPARATUS FOR GENERATING BROADCAST POSITIONING SIGNAL, AND POSITIONING METHOD - The present invention, pertaining to the field of mobile broadcast television technologies, discloses a method and apparatus for generating a broadcast positioning signal, and a positioning method. According to the present invention, a broadcast positioning signal is generated by inserting a spread spectrum signal and a first spread spectrum signal in an orthogonal frequency-division multiplexing (OFDM) signal, and a receiver is positioned according to broadcast positioning signals from at least three different senders. | 12-26-2013 |
20130343433 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION IN SUB GIGAHERTZ BANDS - Systems, methods, and devices for wireless communication are provided. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a processor configured to generate a packet for transmission via a wireless signal. The packet is generated for transmission over a bandwidth of 1 MHz using at least one orthogonal frequency-division multiplexing (OFDM) symbol. The apparatus further includes a transmitter configured to transmit the packet via the wireless signal having unique power spectral density characteristics. | 12-26-2013 |
20140003469 | TRANSMIT PROCESSING USING RECEIVER FUNCTIONS | 01-02-2014 |
20140016675 | INVERTED SPREADING DSSS FOR SMART UTILLITY NETWORKS - A method of operating a transmitter (FIGS. | 01-16-2014 |
20140016676 | SPREAD-SPECTRUM CODES GENERATION - Certain aspects of the present disclosure relate to a method for generating Golay codes and generalized Golay codes in a wireless communication system, and for efficient spreading at a transmitter and despreading at a receiver. | 01-16-2014 |
20140029646 | DISABLING SPREAD-SPECTRUM CLOCK SIGNAL GENERATION - A device may generate a clock signal using spread-spectrum clocking. The spread-spectrum clocking may modulate a frequency of the clock signal to produce a plurality of frequencies for the clock signal during a modulation cycle. The device may receive an instruction to disable the spread-spectrum clocking, and may disable the spread spectrum clocking at the end of the modulation cycle. | 01-30-2014 |
20140036967 | SYSTEM AND METHOD FOR UPLINK MULTIPLE INPUT MULTIPLE OUTPUT TRANSMISSION - Methods and apparatuses are provided for uplink MIMO transmissions in a wireless communication system. In some particular aspects, an uplink MIMO transmission (e.g., a rank 2 transmission) may be established, wherein a primary stream transport block size (TBS) is determined in accordance with a received scheduling grant, and a modulation scheme for the transmission is determined in accordance with the TBS. Further, a predetermined spreading factor, such as a 2×SF2+2×SF4 spreading factor, may be configured for both uplink streams, independent of the TBS. Finally, the uplink MIMO transmission may be made in accordance with the determined TBS, modulation scheme, and spreading factor. In some examples, if the primary stream TBS or a determined secondary stream TBS is less than a minimum threshold TBS, the transmission may be reconfigured as a rank 1 transmission. | 02-06-2014 |
20140050250 | APPARATUS AND METHOD FOR GENERATING GAUSSIAN PULSE AND ULTRA WIDEBAND COMMUNICATION APPARATUS FOR GENERATING GAUSSIAN PULSE - A pulse generation apparatus includes a delay pulse generator configured to generate a plurality of delay pulses, an amplitude modulator configured to modulate amplitudes of the plurality of delay pulses, and a Gaussian pulse generator configured to generate a Gaussian pulse based on the amplitude-modulated delay pulses. | 02-20-2014 |
20140056332 | Generating and Processing of CDMA Signals - Systems and methods for generating a CDMA signal s(t) comprising N components involves assigning to each of the N components one unique spreading sequence a | 02-27-2014 |
20140072016 | APPARATUS AND METHOD FOR NEAR FIELD COMMUNICATION IN ULTRA WIDEBAND (UWB) - Disclosed is an apparatus and method for near field communication in an ultra wideband (UWB). An apparatus for near field communication in an UWB may include a determiner to determine the number of repetitions of a first sequence in each of n preambles, n denoting a natural number, and a processor to generate n short preambles by repeatedly arranging the first sequence based on the determined number of repetitions, and to generate the n preambles by arranging a long preamble with respect to each of the generated n short preambles. | 03-13-2014 |
20140092942 | METHODS AND APPARATUSES USING FILTER BANKS FOR MULTI-CARRIER SPREAD-SPECTRUM SIGNALS - A transmitter includes a synthesis filter bank to spread a data symbol to a plurality of frequencies by encoding the data symbol on each frequency, apply a common pulse-shaping filter, and apply gains to the frequencies such that a power level of each frequency is less than a noise level of other communication signals within the spectrum. Each frequency is modulated onto a different evenly spaced subcarrier. A demodulator in a receiver converts a radio frequency input to a spread-spectrum signal in a baseband. A matched filter filters the spread-spectrum signal with a common filter having characteristics matched to the synthesis filter bank in the transmitter by filtering each frequency to generate a sequence of narrow pulses. A carrier recovery unit generates control signals responsive to the sequence of narrow pulses suitable for generating a phase-locked loop between the demodulator, the matched filter, and the carrier recovery unit. | 04-03-2014 |
20140119410 | SYSTEM AND METHOD FOR COMMUNICATION USING HYBRID SIGNALS - Systems and methods for communication using hybrid signals are disclosed. In one aspect an apparatus for communication includes a processing system configured to encode a first set of information in a plurality of symbols and to encode a second set of information according to a spacing among the symbols. The apparatus may further comprise a transmitter configured to transmit to a device the symbols with the spacing among the symbols. In another aspect, an apparatus for communication includes a processing system configured to decode a first set of information from a plurality of symbols encoded with the first set of information or a second set of information from a spacing among the symbols by determining the spacing among the symbols. The apparatus may further comprise a receiver configured to receive the symbols via a wireless communication. | 05-01-2014 |
20140140375 | METHOD FOR COMPRESSIVE SENSING , RECONSTRUCTION, AND ESTIMATION OF ULTRA-WIDEBAND CHANNELS - The method for compressive sensing (CS) and reconstruction of ultra-wideband (UWB) channels includes building four practically-based dictionaries related to the antenna angles of transmission and angles of arrival that enhance the sparsity of UWB signals. The dictionaries account for the practical effects of the channel, such as pulse dispersion and the unavoidable effects of the antenna. Utilizing the practically-based dictionaries CS is able to reconstruct the UWB signals more efficiently with reasonable complexity. In addition to waveform reconstruction, the dictionaries are used for channel estimation. The CS method can be used with either a single-shot full profile correlator or a Rake receiver. The Rake receiver employs CS in adjusting its parameters to take advantage of the energy available in the strongest propagation paths. | 05-22-2014 |
20140169409 | Systems and Methods for Open-loop Spatial Multiplexing Schemes for Radio Access Virtualization - System and method embodiments are provided for open-loop spatial multiplexing for radio access virtualization. In an embodiment, a system includes a plurality of antenna ports and a processor coupled to the plurality of antenna ports and configured to spread a spreading sequence over at least a portion of the plurality of antenna ports in a spatial domain, wherein the processor is configured to cause the antenna ports to transmit multiple spreading sequences simultaneously by sequence superposition. | 06-19-2014 |
20140177681 | ALL-DIGITAL SPREAD SPECTRUM CLOCK GENERATING CIRCUIT WITH EMI REDUCTION EFFECT AND A METHOD FOR CONTROLLING THE SAME - An all-digital spread spectrum clock generating circuit with EMI reduction effect and a method for controlling the same utilize a digital spread-spectrum clock controlling unit to control a digital controlled oscillator, so that it can directly modulates an output clock frequency. Accordingly, the spectrum of the output clock frequency is spread, and the EMI effect due to the output clock signal is reduced. A spread-spectrum clock controller receives a reference clock counting signal and a dividing clock counting signal generated by a frequency detecting unit. After detecting and judging, the spread-spectrum clock controlling unit modulates and maintains a central frequency of the spread-spectrum clock periodically according to the two counting signals, thereby keeping a stability of the central frequency of the spread-spectrum clock signal and decreasing the complexity of the circuit design. | 06-26-2014 |
20140185654 | ORTHOGONAL FREEQUENCY DIVISION MULTIPLEXING-CODE DIVISION MULTIPLE ACCESS SYSTEM - An orthogonal frequency division multiplexing (OFDM)-code division multiple access (CDMA) system is disclosed. The system includes a transmitter and a receiver. At the transmitter, a spreading and subcarrier mapping unit spreads an input data symbol with a complex quadratic sequence code to generate a plurality of chips and maps each chip to one of a plurality of subcarriers. An inverse discrete Fourier transform is performed on the chips mapped to the subcarriers and a cyclic prefix (CP) is inserted to an OFDM frame. A parallel-to-serial converter converts the time-domain data into a serial data stream for transmission. At the receiver, a serial-to-parallel converter converts received data into multiple received data streams and the CP is removed from the received data. A discrete Fourier transform is performed on the received data streams and equalization is performed. A despreader despreads an output of the equalizer to recover the transmitted data. | 07-03-2014 |
20140269844 | APPARATUS FOR CORRECTING SIGNAL, TRANSMISSION APPARATUS, METHOD OF CORRECTING SIGNAL, AND TRANSMISSION SYSTEM - An apparatus for correcting a signal, includes a correction value calculator that determines a transmission distance of a transmission path through which a timing signal is propagated, the timing signal having a periodically changing frequency, and determines a deviation between a frequency of the timing signal and a frequency of received data, as a correction value, from the transmission distance; and a corrector that corrects the frequency of the timing signal by the correction value for synchronizing transmitted data with the timing signal. | 09-18-2014 |
20140269845 | SYSTEMS/METHODS OF TRANSMITTING INFORMATION VIA BASEBAND WAVEFORMS COMPRISING AGILITY IN FREQUENCY CONTENT AND AN ORTHOGONALITY THEREBETWEEN - Communications systems and/or methods are disclosed that may be used to convey information by forming, and then using, a plurality of frequency agile baseband waveforms, wherein any two different waveforms of the plurality of frequency agile baseband waveforms comprise an orthogonality therebetween. The systems/methods disclosed can convey information by mapping an information sequence into a baseband waveform sequence that includes waveforms of the plurality of baseband waveforms, and by transmitting the baseband waveform sequence. Such systems and/or methods can provide extreme privacy, cognitive radio capability, robustness to fading and interference, communications performance associated with M-ary orthonormal signaling and/or high multiple-access capacity. | 09-18-2014 |
20140294049 | TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM - The present invention provides for transmitting a spread signal in a mobile communication system. The present invention includes spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set. | 10-02-2014 |
20140301431 | METHOD AND APPARATUS FOR CHANNEL MITIGATION USING PER-TONE SPREADING IN SINGLE CARRIER BLOCK TRANSMISSIONS - A method of per-tone spreading in single carrier block transmissions, includes generating a block of modulated symbols, and performing the per-tone spreading on the block of the modulated symbols. Also, a transmitter configured to perform per-tone spreading in single carrier block transmissions, includes a modulator configured to generate a block of modulated symbols, and a spreader configured to perform the per-tone spreading on the block of the modulated symbols. | 10-09-2014 |
20140314126 | METHOD AND APPARATUS FOR CONTINUOUS PHASE MODULATION PREAMBLE ENCODING AND DECODING - Certain aspects of the present disclosure relate to a method for generating single carrier signals with spread-spectrum coded preambles using constant envelope 2-CPM modulation for transmission in a wireless communication system, and for efficient despreading method at a receiver. | 10-23-2014 |
20140321512 | Embedded Meta-Carrier with Spread Spectrum for Periodic-Burst Carriers via Overlaid Carriers - A method for identifying the presence of an electronic transmission comprising detecting, by a detecting device, the presence of a burst of electromagnetic energy that results from the presence of an original carrier signal and transmitting, by a transmitting device, a spread spectrum meta-carrier signal within a portion of a bandwidth of the original carrier signal, wherein the meta-carrier signal contains information about the original carrier signal and is transmitted such that the meta-carrier signal occupies at least a portion of a bandwidth of the original carrier signal during the presence of the burst of electromagnetic energy. | 10-30-2014 |
20140328377 | SEMICONDUCTOR DEVICE, RECEIVER, TRANSMITTER, TRANSCEIVER AND COMMUNICATION SYSTEM - A semiconductor device, includes a clock and data recovery unit to which a receive signal is inputted and which extracts, based on an operation clock signal, a clock signal and a data signal from the receive signal, a frequency error adjusting unit which generates a frequency error signal indicating a frequency error between the clock signal extracted from the receive signal and the operation clock signal, an operation clock generation unit which controls, based on the frequency error signal, a frequency of the operation clock signal, and a Spread Spectrum Clock Generator (SSCG) unit which varies the frequency of the operation clock signal by the SSCG unit based on the frequency error signal. | 11-06-2014 |
20140348212 | SPREAD SPECTRUM ENCODING AND DECODING - Certain aspects of the present disclosure relate to a method for generating spread-spectrum coded signals for transmission in a wireless communication system, and for efficient despreading at a receiver. | 11-27-2014 |
20140369390 | SYSTEM AND METHOD FOR INCREASING MAXIMUM PAYLOAD SIZE - A method and apparatus for increasing, at a transmitter, a payload size of a communication channel having orthogonal groups, the method referencing a base orthogonal sequence set comprising orthogonal sequences that are mutually orthogonal, the orthogonal sequence set having subsets that are sub-block orthogonal with a length of four; and selecting a spreading sequence set from a plurality of spreading sequence sets, each of the plurality of spreading sequence sets comprising an orthogonal sequence set subset combined with an imaginary orthogonal sequence set subset, wherein the selecting increases payload size. | 12-18-2014 |
20140369391 | INTEGRATED CIRCUIT FOR SPREADING RESPONSE SIGNAL - A radio communication apparatus receives control information on one or more control channel elements (CCEs) with consecutive CCE number(s). The radio communication apparatus first-spreads a response signal with a sequence defined by a cyclic shift value that is determined among a plurality of cyclic shift values from an index of physical uplink control channel (PUCCH), which is associated with a first CCE number of the one or more CCEs, and second-spreads the first-spread response signal with an orthogonal sequence that is determined among a plurality of orthogonal sequences from the index. One of cyclic shift values used for an orthogonal sequence is determined from an index of the PUCCH, which is associated with an odd CCE number, and another one of the cyclic shift values used for the same orthogonal sequence is determined from an index of the PUCCH, which is associated with an even CCE number. | 12-18-2014 |
20150016491 | DIFFERENTIATOR BASED SPREAD SPECTRUM MODULATOR - A spread spectrum clock generator which includes a pulse train generator circuit and a modulating circuit configured to produce a modulating signal relating to a time derivative of an output of the pulse train generator circuit. In one embodiment the modulating circuit includes a active differentiator circuit and in another embodiment the modulating circuit includes a passive differentiator circuit. A modulator is included which is configured to produce a spread spectrum clock output which is frequency modulated by the modulating signal. | 01-15-2015 |
20150023397 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING THE HYBRID-ARQ ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - An apparatus and method are provided for transmitting a symbol group in a mobile communication system. The method includes generating the symbol group to which an orthogonal sequence is applied; mapping the generated symbol group to an orthogonal frequency division multiple (OFDM) symbol and a multiple antenna array based on a symbol group index and a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH) group index; and transmitting the mapped symbol group. The generated symbol group is mapped to the OFDM symbol and the multiple antenna array in an alternating pattern in accordance with the symbol group index. | 01-22-2015 |
20150049790 | METHODS AND APPARATUSES USING FILTER BANKS FOR MULTI-CARRIER SPREAD SPECTRUM SIGNALS - A transmitter includes a synthesis filter bank to spread a data symbol to a plurality of frequencies by encoding the data symbol on each frequency, apply a common pulse-shaping filter, and apply gains to the frequencies such that a power level of each frequency is less than a noise level of other communication signals within the spectrum. Each frequency is modulated onto a different evenly spaced subcarrier. A demodulator in a receiver converts a radio frequency input to a spread-spectrum signal in a baseband. A matched filter filters the spread-spectrum signal with a common filter having characteristics matched to the synthesis filter bank in the transmitter by filtering each frequency to generate a sequence of narrow pulses. A carrier recovery unit generates control signals responsive to the sequence of narrow pulses suitable for generating a phase-locked loop between the demodulator, the matched filter, and the carrier recovery unit. | 02-19-2015 |
20150063427 | Phase-Optimized Constant Envelope Transmission (POCET) Method, Apparatus And System - An apparatus and method for generating a composite signal includes electronics configured to modulate a carrier utilizing a finite set of composite signal phases to generate a composite signal, the finite set of composite signal phases being determined through an optimization process that minimizes a constant envelope for the phase modulated carrier, subject to constraints on desired signal power levels of the signals to be combined and either zero or one or more relative phase relationships between the signals. The apparatus and method can be extended to generating an optimized composite signal of different frequencies. | 03-05-2015 |
20150071330 | Spread Spectrum Non-linear Junction Detector - A digital spread spectrum non-linear junction detector (NLJD) utilizes the 2.4 GHz transmission band to increase sensitivity to detect smaller electronics. The receiver chain of the NLJD pre-distorts the transmission signal and correlates the result with the response signal to differentiate between target responses and ambient interference signals. A touch screen display displays a signal strength received by the NLJDs receiver at a second harmonic frequency of the 2.4 GHz transmit signal and a signal strength received by the receiver at a third harmonic frequency of the transmit signal. A frequency swept response received by the receiver in response to the transmitted 2.4 GHz transmit signal is graphically displayed on the touch screen. The use of the 2.4 GHz band, touch screen, correlation based target differentiation and frequency swept response display improve the sensitivity and usability of the NLJD and increase the likelihood of it successfully performing its tasks. | 03-12-2015 |
20150071331 | TRANSMISSION DEVICE AND BANDWIDTH ADJUSTMENT METHOD - A transmitting apparatus is disclosed that adjusts an occupied bandwidth for each transmission rate, and thus can prevent deterioration of an S/N ratio while preventing a situation in which frequency components are cut and cannot be demodulated, without increasing the manufacturing cost. The transmitting apparatus is capable of performing communication at multiple different transmission rates. A modulation section modulates transmission data to generate a modulated signal and adjusts an occupied bandwidth in a passband of a channel selection filter for each of the transmission rates. An occupied bandwidth control section outputs to the modulation section bandwidth setting information that causes a bandwidth to approximate to the bandwidth of a passband of a channel selection filter based on the inputted transmission rate setting information. An RF transmitting section transmits the modulated signal obtained by adjusting the occupied bandwidth via an antenna. | 03-12-2015 |
20150098493 | METHOD FOR SPREADING A PLURALITY OF DATA SYMBOLS ONTO SUBCARRIERS OF A CARRIER SIGNAL - A method for spreading a plurality of data symbols onto subcarriers of a carrier signal for a transmission in a transmission system provides a data vector, including the plurality of data symbols; and generates a spread data vector based on the provided data vector and a spreading matrix, with the spread data vector including a length, which corresponds to the number of subcarriers and with the spreading matrix being based on a spreading allocation matrix, a base spreading matrix, and a randomization matrix. | 04-09-2015 |
20150117496 | Method, Devices and Chip Block for DS-CDMA - The present invention relates to a method of producing a chip block for wireless transmission in a Direct Sequence Code Division Multiple Access (DS-CDMA) communication system. The method comprises spreading a symbol over at least one chip block ( | 04-30-2015 |
20150117497 | DEVICES AND METHODS EMPLOYING HERMETIC TRANSFORMS FOR ENCODING AND DECODING DIGITAL INFORMATION IN SPREAD-SPECTRUM COMMUNICATION SYSTEMS - In a direct sequence spread-spectrum (DSSS) systems, such as CDMA, information is encoded in symbols using phase shift keying or quadrature amplitude modulation. Further, a transmitter applied a selected time shifted lag to each symbol to convey additional information. A receiver detects both the symbol data and the lag value. The receiver can use a hermetic matched filter matrix to identify the lag. | 04-30-2015 |
20150131705 | MODULATION SCHEME FOR COMMUNICATION - A modulation scheme for long range transceiver utilizing a processing scheme in combination with a Hadamard transform is disclosed. The processing scheme can correspond to an industry standard or to other processing schemes. An input signal is parallelized through serial to parallel conversion. The processed parallel signals are orthogonalized using a Hadamard transform to allow multiple channel signals with increased throughput. Accordingly, the long range modulation scheme of this invention can achieve high efficiency and increased throughput while meeting performance goals of long range signal transmission. | 05-14-2015 |
20150139278 | WIDEBAND FREQUENCY SHIFT MODULATION USING TRANSIENT STATE OF ANTENNA - Described herein are architectures, platforms and methods for implementing modulating a radiating signal of a high Q antenna in order to transmit from one frequency to one or more different frequencies which may be in the same narrow band frequency spectrum or in a wide band frequency spectrum. | 05-21-2015 |
20150295632 | Communication Systems and Methods - In accordance with embodiments, a communication system includes a first device and a second device in communication with the first device. The second device has at least a first pair and a second pair of antennas. The second device spreads a communication bit by a predetermined spreading factor and forms a first set of spatial block codes in frequency domain based on the spread communication bit. The first set of spatial block codes being consecutively transmitted on one of the first and second pairs of antennas. | 10-15-2015 |
20160036487 | Phase-Optimized Constant Envelope Transmission (POCET) Method, Apparatus And System - An apparatus and method for generating a composite signal includes electronics configured to modulate a carrier utilizing a finite set of composite signal phases to generate a composite signal, the finite set of composite signal phases being determined through an optimization process that minimizes a constant envelope for the phase modulated carrier, subject to constraints on desired signal power levels of the signals to be combined and either zero or one or more relative phase relationships between the signals. The apparatus and method can be extended to generating an optimized composite signal of different frequencies. | 02-04-2016 |
20160043835 | MODULATION AND EQUALIZATION IN AN ORTHONORMAL TIME-FREQUENCY SHIFTING COMMUNICATIONS SYSTEM - A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix. | 02-11-2016 |
20160112089 | ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING-CODE DIVISION MULTIPLE ACCESS SYSTEM - An orthogonal frequency division multiplexing (OFDM)-code division multiple access (CDMA) system is disclosed. The system includes a transmitter and a receiver. At the transmitter, a spreading and subcarrier mapping unit spreads an input data symbol with a complex quadratic sequence code to generate a plurality of chips and maps each chip to one of a plurality of subcarriers. An inverse discrete Fourier transform is performed on the chips mapped to the subcarriers and a cyclic prefix (CP) is inserted to an OFDM frame. A parallel-to-serial converter converts the time-domain data into a serial data stream for transmission. At the receiver, a serial-to-parallel converter converts received data into multiple received data streams and the CP is removed from the received data. A discrete Fourier transform is performed on the received data streams and equalization is performed. A despreader despreads an output of the equalizer to recover the transmitted data. | 04-21-2016 |
20160134327 | WIRELESS SENSOR PLATFORM - A wireless sensor platform and methods of manufacture are provided. The platform involves providing a plurality of wireless sensors, where each of the sensors is fabricated on flexible substrates using printing techniques and low temperature curing. Each of the sensors can include planar sensor elements and planar antennas defined using the printing and curing. Further, each of the sensors can include a communications system configured to encode the data from the sensors into a spread spectrum code sequence that is transmitted to a central computer(s) for use in monitoring an area associated with the sensors. | 05-12-2016 |
20190149382 | REFERENCE SIGNAL HAVING FLEXIBLE STRUCTURE | 05-16-2019 |