Entries |
Document | Title | Date |
20080205551 | Method, system and apparatus for phase control of transmit diversity signals - Embodiments of the present invention include a method and apparatus for modifying a transmit diversity signal by control of at least a relative parameter, for example, phase difference, in a first signal relative to at least one second signal using various switching modules or techniques. In some embodiments of the invention, the relative difference may be controlled by switching paths, or producing various degrees of relative difference by switching, activating or controlling multiple elements with various resolutions of the relative parameter, or by connecting elements by timing of switches. | 08-28-2008 |
20080219380 | Data Encoding in a Clocked Data Interface - One embodiment of the present invention includes a data transmission system. The system comprises a data transmitter that provides a plurality of data bits over at least one data line. The data transmitter comprises a clock that provides a clock signal associated with timing for latching the plurality of data bits and a data encoder configured to encode error data associated with the data transmission system in the clock signal. | 09-11-2008 |
20080225985 | Method and Apparatus for Enhancing GSM System Capacity - There is provided a system and method of enhancing capacity of a wireless communication channel compromising the steps of modulating data in accordance with first modulation scheme transforming the modulated data from a frequency domain symbol to a time domain version and encoding bits in a wireless communication timeslot independence upon the time domain version whereby capacity of the wireless communication channel is enhanced. The system and method further comprises the steps of: means for receiving the timeslot means for decoding the timeslot and means for transforming the decoded bits from time domain to frequency domain to recover the data. GSM capacity is enhanced between two and six times. | 09-18-2008 |
20080273626 | SYSTEM AND METHOD FOR PERFORMING BASEBAND PHASE SHIFTING IN A CARTESIAN FEEDBACK SYSTEM - A system and method for performing baseband phase shifting in a Cartesian feedback system includes a forward path for receiving an input baseband signal having two components, and performing up-conversion to output a RF signal; a power amplifier for amplifying the RF signal output from the forward path; and a feedback path for down-converting at least a sample of the output from the power amplifier to a feedback baseband signal comprising two components, and providing the feedback baseband signal to the forward path in order to be summed with the input baseband signal at a summing junction and before the loop filter. The forward path includes a baseband phase shifter for adjusting the baseband signal output from the summing junction in order to compensate for any phase shifts induced in the system. | 11-06-2008 |
20080279308 | Method and Transmitter Structure Reducing Ambiguity By Repetition Rearrangement in the Symbol Domain - A method is provided which improves reliability of channel estimation in a digital communication system by reducing the ambiguity in the recognition of received symbols evaluated for the channel estimation. A data word transmitted according to a first mapping of data word values to modulation states is re-transmitted at least once with a second, re-arranged mapping of data word values to modulation states. The second mapping and possible further mappings are generated from the first mapping in a way that the number of different results which can be obtained from combining the transmitted original data symbol and the re-transmitted counterpart data symbol(s) is lower than the number of original modulation states in the first mapping. | 11-13-2008 |
20090003488 | TRANSMITTER AND RECEIVER - There is provided with a transmitter including: a modulator configured to modulate a data bit sequence by alternately using first and second signal point sets to generate a data symbol sequence; a data block generator configured to generate data blocks each including a plurality of data symbols, an addition unit configured to add a guard interval to each data block to generate data blocks with guard intervals; and a controller configured to control modulation by the modulator so that an end data symbol of a first data block with the guard interval and a head data symbol of a second data block with the guard interval generated following the first data block with the guard interval belong to different signal point sets and data symbols in the first and second data blocks with the guard interval alternately belong to the first and second signal point sets. | 01-01-2009 |
20090028270 | MIMO BROADBAND CHANNEL EMULATOR - The present invention relates to a multiple input, multiple output broadband channel emulator. The broadband emulator having RF input signals comprises a mixing matrix. The mixing matrix includes two broadband splitters, two broadband combiners, one phase shifter. More particularly, the broadband power splitter/combiner includes four transmission lines, a resistor being provided as a termination, and a 180 degree phase shifter, wherein the phase shifter is positioned in the transmission path. | 01-29-2009 |
20090046809 | Sampling Demodulator for Amplitude Shift Keying (ASK) Radio Receiver - A method, algorithm, circuits, and/or systems for amplitude shift keying (ASK) modulation are disclosed. In one embodiment, a sampling demodulator includes a comparator configured to compare an ASK modulated input to a predetermined voltage level and provide a comparison result, a pulse stretcher with a sampler configured to sample the comparison result a plurality of times for each of a plurality of cycles of the ASK modulated input to generate a bit stream and digital logic configured to determine a value for each data bit in the ASK modulated input from the bit stream, and a digital filter configured to filter an output of the digital logic, thereby providing a demodulated signal. | 02-19-2009 |
20090046810 | GAIN WEIGHTED CODE COMBINING SYSTEM AND METHOD FOR COMBINING BPSK CODES - A method and system for generating a composite binary phase shift keying (BPSK) code from at least two independent component BPSK codes that is representative of each of the component BPSK codes. According to one embodiment the method involves gain weighting each BPSK code by its respective code power ratio to form a corresponding pluarity of gain weighted codes. The gain weighted codes are then processed in accordance with an algorithm to form a composite BPSK code. The composite BPSK code has at least a fifty percent probability of matching each one of the component BPSK codes. Specific implementations for generating a composite BPSK code from either two component BPSK codes, or from three component BPSK codes, are also disclosed. | 02-19-2009 |
20090046811 | TRANSMITTING APPARATUS, RECEIVING APPARATUS, TRANSMISSION METHOD, AND RECEPTION METHOD - A transmission method includes generating a control information signal relating to control information of a data signal. A transmission frame is formed by repeating and discretely arranging the same control information signal. The data signal and the control information signal are transmitted using the transmission frame. | 02-19-2009 |
20090060090 | TRANSMITTER AND RECEIVER - There is provided with there is provided with a transmitter including: a pilot generation unit configured to generate a plurality of pilot symbols; a bit sequence generation unit configured to invert each bit in a first bit sequence to generate a second bit sequence; a transmission block generation unit configured to generate a transmission block by giving phase rotation determined according a value of each of bits in the first and second bit sequence to each of the pilot symbols corresponding to each of the bits; and a transmission unit configured to transmit the transmission block. | 03-05-2009 |
20090067544 | METHOD FOR RECOVERING A BASEBAND SIGNAL FROM AN RF SIGNAL - By shifting an RF signal to IQ components of a modulated baseband signal directly, the zero-IF technology and IQ interface are applied in ATSC, NTSC, and PAL systems, and VSB and SSB modulations. The mathematic calculations are based on Fourier transform for shifting the RF signal and for recovering a baseband signal from the modulated baseband signal. | 03-12-2009 |
20090074109 | High power high linearity digital phase shifter - A digital phase shifter suitable for high power RF applications is disclosed. A plurality of MEMs switches selectively couple delay lines into the RF signal path providing adjustable phase shift under digital control. 90 degree hybrid combiners on either side of the MEMs switches allow two signal paths to be used in combination to provide a desired number of phase shift steps with a reduced number of delay lines and switches and with lower power level on each path. | 03-19-2009 |
20090103651 | Digital Video Broadcast Service Discovery - Embodiments are directed to binary phase shift key modulating a first pilot symbol according to a reference sequence, and differentially binary phase shift key modulating a second pilot symbols. The original reference sequence and the delayed differentially modulated sequence are then combined before performing an Inverse Fast Fourier Transform and inserting a guard interval. Receiver operations are an inverse of the transmitter operations, which were just discussed. The receiver does not have to know the reference sequence. Embodiments are directed to specifying a plurality of seeds that are bit patterns each having r bits not all of which have a value of zero, extending the seeds into respective sequences by applying to each seed a recurrence formula; and using one of the sequences as a comb sequence and using the sequences other than the comb sequence as binary phase shift keying patterns. | 04-23-2009 |
20090154598 | DIGITAL MODULATOR FOR A GSM/GPRS/EDGE WIRELESS PLAR RF TRANSMITTER - A digital modulator in a radio transmitter includes circuitry for switching between Gaussian Minimum Shift Keying (GMSK) and Phase-Shift Keying (PSK) while maintaining spectral mask requirements. The digital modulator of the present invention includes both GMSK and PSK symbol mappers that produce PSK in-phase and quadrature symbols and GMSK symbols, respectively, to a pulse shaping block. Based on opposite phases of a modulation control signal, the symbol mappers produce either modulated data or a steam of logic zeros to the pulse shaping block. The pulse shaping block filters the received data and multiplexes the data so that each modulated data stream receives non-zero data during a guard time to avoid abrupt changes in the modulated signal that would violate the spectral mask requirements. | 06-18-2009 |
20090220027 | Method For Coding Data Symbols - Data symbols, transmitted by OFDM radio using at least two transmission antennae, are coded by a DSTBC coding and a DSTFBC coding. Two adjacent data symbols of a selected sub-carrier are provided for initializing a DSTFBC coding in a sub-carrier direction and are used for DSTFBC coding of similarly positioned data symbols in further sub-carriers in the sub-carrier. The DSTFBC coding is carried out from the data symbols of the first sub-carrier direction. In each sub-carrier the two data symbols formed by DSTFBC coding are used for initializing a DSTBC coding in the OFDM symbol direction. In the reverse direction, two sequential DSTBC coded data symbols on a first sub-carrier for initializing a DSTFBC coding in a sub-carrier direction and are used for DSTFBC coding of similarly positioned data symbols in further sub-carriers for DSTFBC coding from the data symbols of the first sub-carrier over the adjacent sub-carriers. | 09-03-2009 |
20090323862 | MOBILE TELECOMMUNICATION DEVICE AND RAMPING DATA TRANSMITTING METHOD THEREOF - A mobile telecommunication device includes a digital baseband processing unit and an analog baseband processing circuit. The digital baseband processing unit is configured to extract a difference value of current ramping data of ramping data of ramping samples of a ramping profile from previous ramping data, the current ramping data and the previous ramping data having a first bit number, and to transmit the difference value to the analog baseband processing unit as sample difference ramping data having a second bit number which is smaller than a first bit number. The analog baseband processing unit configured to receive the sample difference ramping data, and to generate a ramping up/down signal of the first bit number based on the sample difference ramping data, wherein the ramping up/down signal controls an output power level of the mobile telecommunication device. | 12-31-2009 |
20090323863 | SIGNAL GENERATION USING PHASE-SHIFT BASED PRE-CODING - A phase-shift based pre-coding scheme used in a transmitting side and a receiving side that has less complexity than those of a space-time coding scheme, that can support various spatial multiplexing rates while maintaining the advantages of the phase-shift diversity scheme, that has less channel sensitivity than that of the pre-coding scheme, and that only requires a low capacity codebook is provided. | 12-31-2009 |
20100014610 | SPACEFLIGHT HIGH DATA RATE RADIATION HARD KA-BAND MODULATOR - A Ka-band transmitter. The transmitter is in a self-contained module that contains a radio frequency (RF) channel. A phase lock oscillator drives an RF signal path in the RF channel at a fundamental frequency. In-phase data (I-data) and Quadrature data (Q-data) difference signals are converted to single ended signals and filtered in a pair of low pass filters and passed as inputs to a Quadriphase Shift Keying (QPSK) vector modulator in the RF signal path, e.g., an in-line even-harmonic modulator. The output of the QPSK vector modulator, is a Ka-band signal that is passed to a driver which may drive a load, e.g., an antenna. | 01-21-2010 |
20100014611 | METHOD FOR DECIDING POSITION OF MAPPING SYMBOLS, AND DEVICE AND METHOD FOR MODULATING BINARY SIGNAL - Disclosed is a binary signal modulator for minimizing deterioration of receiving performance caused by phase error. The binary signal modulator receives binary signals, and converts the binary signals into complex symbols according to a predetermined mapping relation. Here, the mapping relation is generated when a plurality of mapping symbols are arranged on a plurality of trajectories so that the distance between the mapping symbols is greater than or equal to a predetermined distance and the phase between the mapping symbols is greater than or equal to a predetermined angle from among the trajectories starting from a plurality of points on the complex plane, and a distance between the trajectories is greater than or equal to the minimum distance from among the distances between the points. | 01-21-2010 |
20100034316 | Millimeter wave radio with phase modulation - Millimeter wave radio with phase modulation. In preferred embodiments each of the two radios in a link uses a single aperture to transmit radiation in one of the two bands, and receive radiation in the other of the bands. The counterpart radio used to form a link preferably is almost identical, except for the interchange of the transmit and receive frequencies. Preferred embodiments utilize a modulation scheme in which the radios each receive on-off keyed data and transmit the on-off keyed data encoded in a millimeter wave carrier wave with binary phase shift keying. | 02-11-2010 |
20100067617 | Jumpless Phase Modulation In A Polar Modulation Environment - The present disclosure relates to circuits and methods for improving the performance of a polar modulator by maintaining the input to a phase modulator. | 03-18-2010 |
20100086082 | RADIO COMMUNICATION TERMINAL DEVICE, RADIO COMMUNICATION BASE STATION DEVICE, AND RADIO COMMUNICATION METHOD - Disclosed are a radio communication terminal device, a radio communication base station device, and a radio communication method which can prevent input of an interference wave peak into a detection window of a cyclic shift sequence allocated to a local cell and improve the channel estimation accuracy in a base station. A frequency serving as a reference is set for a transmission band width of all the cells and respective terminals in which frame synchronization is established. By using the frequency as a reference point, a phase rotation addition unit ( | 04-08-2010 |
20100111228 | RADIO COMMUNICATION APPARATUS AND RADIO COMMUNICATION METHOD - Provided is a wireless communication apparatus wherein channel estimation accuracy is improved while keeping the position of each bit in a frame, even when a modulation system having a large modulation multiple value is used for a data symbol. In the wireless communication apparatus ( | 05-06-2010 |
20100111229 | METHOD AND APPARATUS OF GENERATING PACKET PREAMBLE - A wireless communication device, a wireless communication system and a method for transmitting a packet preamble of signal sequences to both a single carrier wireless device and a multiple carrier wireless device. The packet preamble includes a first sequence for detecting a signal and a second sequence for estimating a channel. | 05-06-2010 |
20100189193 | POLAR MODULATION TRANSMITTER AND POLAR MODULATION TRANSMISSION METHOD - A power amplifier ( | 07-29-2010 |
20100195765 | RADIO FREQUENCY MODULATING CIRCUIT, AND TRANSMITTER HAVING THE SAME - A radio frequency modulating circuit of a transmitter includes a phase multiplexer including a plurality of phase followers each coupled to a selector and operating in accordance with a corresponding pair of complementary-level carrier signals received thereby. The selector is operable to enable conduction of one of the phase followers therethrough in response to a data sequence modulated from a data stream by a phase shift keying modulating circuit. A conversion amplifier is operable in accordance with the complementary-level carrier signals of a conducting one of the phase followers so as to output a phase-modulated output corresponding to the data stream. The phase-modulated output is amplified by a power amplifier and is transmitted through an antenna. | 08-05-2010 |
20100202564 | ZIGBEE COMMUNICATION APPARATUS AND METHOD FOR HIGH-SPEED TRANSMISSION AND RECEPTION - A ZigBee communication apparatus and method for high-speed transmission and reception are provided. The apparatus includes a controller, a first transmission unit, and a second transmission unit. The controller outputs a first control signal controlling high-speed transmission and a second control signal controlling general transmission. The first transmission unit transmits data at high speed when receiving the first control signal. The second transmission unit transmits data at general speed when receiving the second control signal. | 08-12-2010 |
20100202565 | COMMUNICATION USING CONTINUOUS-PHASE MODULATED SIGNALS - Embodiments of a circuit are described. In this circuit, a modulation circuit provides a first modulated electrical signal and a second modulated electrical signal, where a given modulated electrical signal, which can be either the first modulated electrical signal or the second modulated electrical signal, includes minimum-shift keying (MSK) modulated data. Moreover, a first phase-adjustment element, which is coupled to the modulation circuit, sets a relative phase between the first modulated electrical signal and the second modulated electrical signal based on a phase value of the first phase-adjustment element. Additionally, an output interface, which is coupled to the first phase-adjustment element, is coupled to one or more antenna elements which output signals. These signals include a quadrature phase-shift-keying (QPSK) signal corresponding to the first modulated electrical signal and the second modulated electrical signal. | 08-12-2010 |
20100208844 | SYSTEM AND METHOD FOR ARBITRARY PHASE AND AMPLITUDE MODULATION IN AN ANTENNA - A system and method for arbitrarily switching phase and amplitude at an antenna. A Direct Spatial Antenna Modulation (DSAM) system makes use of the spatial characteristics of a radiating antenna structure to directly alter a signal transmitted or received by the radiating structure. A data stream maps a carrier to different spatial points of excitation in the antenna structure, where each chosen configuration has different radiating characteristics including phase, amplitude, and polarization, which can be used represent data symbols. The spatial points of a radiating structure may be mapped directly to In-Phase and Quadrature components of the output using two spatial feedpoints and amplitude control to the feedpoints. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this Abstract. | 08-19-2010 |
20100220814 | METHOD AND APPARATUS FOR SPATIAL TEMPORAL TURBO CHANNEL CODING/DECODING IN WIRELESS NETWORK - The present invention proposes a channel encoder, and a channel encoding method executed by the channel encoder comprising the steps of: (a), converting the serial data stream to be encoded into multiple parallel signals; (b). interleaving the multiple parallel signals; (c). according to predefined encoding rule, encoding the multiple parallel signals and interleaved multiple parallel signals separately to obtain encoded multiple parallel signals; and (d). transmitting the interleaved multiple parallel signals and the multiple parallel signals via multiple Tx antenna cyclically and alternately. The channel encoder according to the present invention can achieve better decoding performance at receiver due to the combination of Turbo encoding scheme. | 09-02-2010 |
20100284491 | Method and Apparatus for Obtaining Symbol Mapping Diversity, Creating Constellation Map, and Modulating - A method and apparatus for obtaining a Symbol Mapping Diversity (SMD), creating a constellation map, and modulating are disclosed. | 11-11-2010 |
20100303172 | METHODS AND TECHNIQUES FOR 3G CELLULAR TRANSMITTERS - A transmitter operates in different modulation modes to support both GSM/EDGE and WCDMA cellular telephony applications. The transmitter modulates an outgoing signal to produce a complex modulated signal in a first modulation mode and a constant or variable envelope modulated signal in a second modulation mode. A local oscillation generator and mixer operate to up-convert the complex modulated signal to produce a modulated RF signal in the first modulation mode and to up-convert the phase component of the constant or variable envelope modulated signal to an RF phase signal and mix the RF phase signal with the envelope component thereof to produce the modulated RF signal in the second modulation mode. | 12-02-2010 |
20100310009 | METHOD AND APPARATUS FOR CONSTANT ENVELOPE MODULATION - Certain aspects of the present disclosure relate to a method for modulating single carrier signals using constant envelope 2-CPM modulation and quasi-constant envelope filtered continuously rotated pseudo-PSK modulation in a wireless communication system. | 12-09-2010 |
20100316165 | APPARATUS AND METHOD OF TRANSMITTING/RECEIVING SIGNALS USING SIGNALING POINT ROTATION AT MUTUAL COOPERATION TRANSMISSION - An apparatus for and method of transmitting and/or receiving a signal by using signaling point rotation in mutually cooperative relaying are provided. The apparatus for transmitting a signal includes: a rotated I-channel generation unit rotating a symbol containing data of a first user, by a predetermined angle, and then, obtaining the I-channel (in-phase) component of the rotated symbol; a rotated Q-channel generation unit receiving a symbol rotated by a predetermined angle, of a previous time slot from a node of a second user performing mutually cooperative relaying with the node of the first user, detecting the I-channel component, and obtaining the Q-channel (quadrature-phase) component of a symbol containing data of the second user from the detected I-channel component; and a combining unit combining the I-channel component of the first user generated in the rotated I-channel generation unit and the Q-channel component of the second user generated in the rotated Q-channel generation unit, thereby generating one symbol. | 12-16-2010 |
20100316166 | METHOD FOR GENERATING A DATA BLOCK FOR TRANSMISSION USING A CPM SCHEME - A method for generating a data block for transmission using a continuous phase modulation scheme is disclosed. In one aspect, the method includes inserting payload data in the data block, the payload data having a plurality of payload symbols, each involving an state change in a continuous phase modulation waveform generated from the data block in one of two opposite directions. It may include inserting state compensation data in the data block for cancelling out the state changes, such that the waveform has an end state at the end of the data block equal to a begin state at the beginning of the data block. The state compensation data is determined by determining from the state changes an overall state change caused by the payload data over the waveform and by selecting a set of compensation symbols for the state compensation data on the basis of the overall state change. | 12-16-2010 |
20110002416 | METHOD OF COMMUNICATING FOR SMART UTILITY NETWORK USING TV WHITE SPACE AND APPARATUS FOR THE SAME - There are disclosed a method of communicating for a smart utility network using a TV white space and an apparatus for the same. The method of communicating for a smart utility network using a TV white space according to the present invention includes: generating a time domain sequence repeated every predetermined number of samples; generating an OFDM symbol having a cyclic prefix length corresponding to an FFT size divided by a natural number of 2 or more and including samples of a number corresponding to the sum of the FFT size and the cyclic prefix length; and generating an SUN packet to be transmitted through a TV channel band selected in the TV white space by using the time domain sequence and the OFDM symbol. Accordingly, it is possible to satisfy all requirements required by the IEEE 802.15.4g SUN standardization group. | 01-06-2011 |
20110044406 | SIGNALLING METHOD AND APPARATUS USING FREQUENCY PILOTS BASED ON COMPLEMENTARY SEQUENCES - The invention relates to a signalling method using orthogonal frequency division multiplexing (OFDM), based on a preamble comprising N dedicated carriers (frequency pilots), the position and modulation of which is defined by one or more concatenated complementary sequences of length N. Complementary sequences are those for which the sum of the autocorrelations thereof is zero except for zero shift, i.e. a Krönecker delta. The main purpose of said preamble is to signal the basic properties of the transmitted signal and to provide a first estimation at the moment of time and frequency synchronisation. The preamble is multiplexed or sequenced temporally with the transmitted data using OFDM prior to the application of the inverse Fourier transform by the inverse fast Fourier transform (IFFT) block. | 02-24-2011 |
20110096871 | Data transmission method - A data transmission method is disclosed, and the method comprises: encoding binary data to be transmitted with encoding principle as follows: encoding binary data x1 in the manner of no jumping at middle phase; encoding binary data x2 in the manner of jumping at middle phase; and after encoding two binary data x1 consecutively with high level of no jumping at middle phase, encoding the immediate following binary data x1 with low level of no jumping at middle phase; encoding binary data x1 with high level of no jumping at middle phase, wherein the binary data x1 follows binary data x1 encoded by using low level of no jumping at middle phase; and encoding binary data x1 immediately following binary data x2 by using high level of no jumping at middle phase; modulating the encoded data; and transmitting the modulated signal. | 04-28-2011 |
20110103516 | DEVICE, METHOD AND SYSTEM FOR TRANSMITTING DIGITAL BROADCASTING SIGNAL - A device for transmitting digital broadcast signal comprises: at least a first encoding unit, each of which encodes data of a sub-channel with forward error correction encoding; at least a time-domain interleaving unit, each of which receives data output from a first encoding unit and performs interleaving in time-domain on the encoded data; a first multiplexing unit, which multiplexes the interleaved data output from each of the time-domain interleaving unit into Main Service Channel (MSC) data; a second encoding unit, which performs forward error correction encoding on a second set of data to obtain Fast Information Channel (FIC) data; a differential modulating unit, which performs differential modulation on the FIC data by using a first modulation mode and on the MSC data by using a second modulation mode, wherein the modulation level of the first modulation mode is lower than that of the second modulation mode; and a frame generating and transmitting unit, which generates signal unit transmission frames by using differential-modulation symbol sequences generated by the differential modulating unit and transmitting said signal unit transmission frames. | 05-05-2011 |
20110122970 | DUAL PRUPOSE MODULATOR - The present invention provides a single modulator capable of transmitting an input according to a first and a second modulation technique. The first modulation technique represents changes in the input using a first set of carrier waveform parameters, such as phase variations, whereas the second modulation technique represents changes in the input using a second set of carrier waveform parameters, such as alternative phase variations. The present invention performs both modulation techniques by expressing the 10 second set of carrier waveform parameters as a subset of the first set of carrier waveform parameters. In a preferred embodiment, the first and second modulation techniques comprise the π/2-offset 2PSK (a good approximation of differential GMSK) and 3π/8-offset 8PSK (also known as EDGE) modulation techniques. | 05-26-2011 |
20110150134 | APPARATUS AND METHOD FOR SCRAMBLING IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and method for scrambling in a wireless communication system are provided. The apparatus includes a selector, a plurality of scramblers, and a plurality of modulators. The selector selects a scrambling scheme to be applied to a transmission bit stream according to a modulation scheme to be applied to the transmission bit stream. The plurality of scramblers scramble the transmission bit stream according to a scrambling scheme corresponding to each of a plurality of modulation schemes. The plurality of modulators modulate the scrambled transmission bit stream according to the plurality of modulation schemes. | 06-23-2011 |
20110188605 | FRAMING METHOD AND A FRAMING DEVICE OF THE COMMON INTERLEAVED FRAME - A framing method of the common interleaved frame is provided, which includes the following steps: obtaining the position information of each sub-channel in the common interleaved frame; depositing data bits in each sub-channel accordingly based on the position information of each sub-channel and the number of bits comprised in the capacity unit CU; wherein the number of bits comprised in the CU is determined by a symbol mapping mode of each sub-channel. The method can help the skilled in the art to make a CIF with the data bits at the transmitter of the T-MMB system. A framing device of the common interleaved frame is also provided in the present invention. | 08-04-2011 |
20110216852 | Architectures and methods for code combiners - Various embodiments are directed to systems and methods for combining a plurality of codes. The plurality of codes may be binary codes having possible logical values of −1 and +1 and may comprise an even number of codes. An output of the combining v | 09-08-2011 |
20110274212 | METHOD AND APPARATUS FOR TRANSMITTING DATA IN A DIGITAL COMMUNICATION SYSTEM, AND COMPUTER-READABLE STORAGE MEDIUM RELATING THERETO - The present invention is directed to a transmitter and method for transmitting data in a digital communication system, the method comprising generating an original symbol by mapping the bits of the original bit sequence using a modulation constellation, generating at least one counter part symbol from the original symbol or from at least one counter part bit sequence generated from the original bit sequence where a combination of the original symbol and the at least one counter part symbol forms a quasi pilot symbol. | 11-10-2011 |
20120002756 | Modulation of Signal Field in a WLAN Frame Header - A plurality of training fields of a preamble of a physical layer data unit are generated, and training fields of the plurality of training fields are mapped to respective signal streams of a plurality of streams using a mapping matrix. A signal field of the preamble of the data unit is generated, and the signal field is mapped to the plurality of signal streams using a column of the mapping matrix. The plurality of signal streams are mapped to a plurality of spatial streams, and at least i) the plurality of training fields and ii) the signal field are transmitted via the plurality of spatial streams. | 01-05-2012 |
20120069933 | Method and A Device for Sequencing the ZC Sequences of the Random Access Channel - The present invention discloses a method and a device for sequencing the ZC sequences of the random access channel. The method for sequencing the ZC sequences includes the following steps: Step | 03-22-2012 |
20120076241 | MULTIPLE-INPUT MULTIPLE-OUTPUT WIRELESS TRANSCEIVER ARCHITECTURE - A wireless transceiver includes a receiver and a transmitter, the receiver and transmitter implemented to have multiple receive and transmit channels respectively, to provide multiple-input multiple-output (MIMO) capability. In an embodiment, the transceiver is implemented to include two transmit channels and two receive channels. Some blocks/circuitry of each of the receive and transmit channels are implemented with reduced area and current consumption, with a corresponding increase in noise. In a single-input single-output (SISO) mode of operation, the receiver combines the output of both the receive channels to compensate for the increase in noise due to the implementation with smaller area and lower current consumption. Similarly, the transmitter combines the output of both the transmit channels to compensate for the increase in noise. The transceiver operates with no signal degradation in SISO mode, and with a small degradation in signal quality in the MIMO mode. | 03-29-2012 |
20120093262 | METHOD AND APPARATUS OF MODULATING SIGNAL IN BROADCASTING AND COMMUNICATION SYSTEM - Modulating method and apparatus in a broadcasting and communication system are provided. The modulating apparatus includes: a first quadrature phase shift keying (QPSK) modulating unit QPSK-modulating first data including in-phase (I) data and quadrature (Q) data to generate a first signal; a phase rotating unit rotating a phase of the first signal by θ to generate a phase rotated signal; a second QPSK modulating unit QPSK-modulating second data different from the first data and including I′ data and Q′ data to generate a second signal; and a layer modulating unit modulating the phase rotated signal and the second signal to output a final signal. | 04-19-2012 |
20120114076 | VARIABLE PHASE SHIFTER-ATTENUATOR - A phase shifter-attenuator system having: a controller for producing a digital word representative of a predetermined phase shift and attenuation provided to an input signal; and a phase shifter-attenuation section. The phase shifter-attenuation section includes: a phase rotator for providing one of a plurality combinations of phase shifts-attenuation states to the input signal selectively in accordance with one portion of the produced digital word; and an attenuation section for distributing the plurality of combinations of phase shift-attenuation states over a selected range of attenuations, such range being selected in accordance with a second portion of the produced digital word. The phase shifter-attenuator section provides one of a plurality of combinations of phase shift-attenuation states to the input signal selectively in accordance with one portion of the produced digital word, the combinations being distributed over a range of attentions selected in accordance with a second portion of the digital word. | 05-10-2012 |
20120140854 | RADIO COMMUNICATION DEVICE, RADIO COMMUNICATION METHOD, AND COMMUNICATION SYSTEM - A radio communication device which when transmitting both a first information sequence, on which π/4-shift differential phase shift modulation is performed, as a delayed wave and a second information sequence, on which a differential phase shift modulation is performed, as an advance wave by using a PADM method, interchanges signal points respectively belonging to quadrants which are one of a first quadrant and a third quadrant, a second quadrant and a fourth quadrant, the first quadrant and the second quadrant, the first quadrant and the fourth quadrant, the second quadrant and the third quadrant, and the third quadrant and the fourth quadrant, the signal points being included in signal points mapped onto a complex plane which consists of a real number axis and an imaginary number axis, to change the arrangement of the information sequence. | 06-07-2012 |
20120170683 | Methods, Apparatuses, and Related Computer Program Product for Information Channel Configuration - It is disclosed a method (and related apparatus) including configuring N information channels each carrying acknowledgement information such that the N pieces of acknowledgement information are transmittable in the form of a phase shift keying symbol having an order of N | 07-05-2012 |
20120177144 | METHOD AND APPARATUS FOR TRANSMITTING SYMBOL REPEATEDLY IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for a transmitter to transmit data in a wireless communication system are provided. This method includes: generating a first signal field including at least one symbol; generating a second signal field configured by repeating at least one symbol of the first signal field; and transmitting a frame including the first signal field, the second signal field, and a data field and a first symbol of the second signal field is modulated through binary phase shift keying (BPSK) and symbols from a second symbol of the second signal field are modulated through Q-BPSK. According to the present invention, a service filed can be extended while maintaining compatibility with a wireless communication system in the related art by transmitting a frame using symbol repetition. | 07-12-2012 |
20120177145 | SEQUENCE-GENERATING METHOD, AND APPARATUS FOR SAME - The present invention relates to a wireless communication system. More particularly, the present invention relates to a method for enabling a transmitter to transmit a sequence in a wireless communication system, and to an apparatus for the same. A sequence-transmitting method comprises the steps of: performing at least one of a complex conjugate operation and a reverse operation on a first sequence to generate a second sequence; mapping the second sequence to a plurality of subcarriers in an Orthogonal Frequency Division Multiple Access (OFDMA) symbol; and transmitting the OFDMA symbol to a receiver. The invention also relates to an apparatus for the sequence-generating method. | 07-12-2012 |
20120201331 | DATA TRANSMISSION APPARATUS AND METHOD, AND DATA RECONSTITUTION APPARATUS AND METHOD - Disclosed are data transmission/reception apparatus and method that may be applied to a case where additional data is to be transmitted in a CE-OFDM modulation/demodulation scheme that satisfies an OFDM feature which is robust against multipath fading and simultaneously has a feature that amplitude is constant. Service channel information, modulation parameter information of a physical layer, and the like, may be transmitted by using an additionally secured information channel. If using this, a service search time may be saved, and power of a receiver may be reduced. | 08-09-2012 |
20120219093 | METHOD AND APPARATUS FOR CHANNEL QUALITY MEASUREMENTS - A method and apparatus for measuring channel quality over which has been transmitted a sequence of symbols produced by encoding and constellation mapping a source data element sequence. A sequence of received symbols is received over the channel. The sequence of received symbols is de-mapped based on a first channel quality indicator previously transmitted to a transmitter of the sequence of symbols. The de-mapped symbols are decoded to produce a decoded output sequence. In some embodiments, the decoding may be based on the first channel quality indicator. The decoded output sequence is re-encoded to produce a re-encoded output sequence. The de-mapped symbols are correlated with the re-encoded output sequence to produce a second channel quality indicator. The second channel quality indicator is transmitted to the transmitter to adaptively select a type of mapping based on the second channel quality indicator. | 08-30-2012 |
20120250792 | Alignment of In-phase and Quadrature Data in Quadrature Phase Shift Keying Optical Transmitters - I/Q data skew in a QPSK modulator may be detected by sending identical or complementary data streams to I and Q channel PSK modulators, setting the relative carrier phase between I and Q to zero or π, and monitoring the average QPSK output power, where the data streams sent to the I and Q channels include streams of alternating ones and zeroes. | 10-04-2012 |
20120250793 | In-Phase and Quadrature Pattern Alignment for Quadrature Phase Shift Keying Optical Transmitters - I/Q data skew in a QPSK modulator may be detected by sending identical or complementary data streams to I and Q channel PSK modulators, setting the relative carrier phase between I and Q to zero or π, and monitoring the average QPSK output power, where the data streams sent to the I and Q channels include pseudorandom streams of ones and zeroes. | 10-04-2012 |
20120294388 | VECTOR MODULATOR - Disclosed is a vector modulator. The vector modulator can control the amplitude and phase of an input signal, by not using amplitude variable attenuators but using phase shifters. Further, the vector modulator has a simple configuration and enables an input signal to be exactly modulated. Furthermore, the vector modulator can modulate the phase of an input signal throughout all areas in the polar coordinate system. | 11-22-2012 |
20120321019 | TRANSMITTING DEVICE, RECEIVING DEVICE AND COMMUNICATION METHOD FOR AN OFDM COMMUNICATION SYSTEM WITH NEW PREAMBLE STRUCTURE - A transmitting device, a receiving device, and a communication method for transmitting and receiving data modulated on frequency subcarriers of an OFDM communication system. An OFDM burst includes a preamble part and payload data part, whereby the preamble includes a section of pilot symbols mapped onto every n-th frequency subcarrier and signaling data mapped onto the frequency subcarriers between the frequency subcarriers with the pilot symbols. A first channel estimation on the basis of the received pilot symbols is performed, the result of which is used to reconstruct the entire section of the received preamble as a training pattern for an accurate channel estimation, which is used for a channel equalization of the received payload part. | 12-20-2012 |
20130022153 | Method and apparatus for controlling phase delay offset point of modulator - The present invention provides a method and an apparatus for controlling a phase delay offset point of a modulator. The method comprises: acquiring backlight detection current signals output from a modulator in different working states, and determining harmonic amplitude values of the backlight detection current signals corresponding to the different working states; determining a detection value of a phase delay offset point corresponding to the modulator according to the determined harmonic amplitude values; comparing the detection value with a set target value of the phase delay offset point, and controlling a position of the phase delay offset point corresponding to the modulator according to the comparison result. The accuracy of controlling the position of the phase delay offset point of the modulator and the performance of the Differential Quadrature Phase Shift Keying (DQPSK) modulation system are improved through the technical solution. | 01-24-2013 |
20130039442 | Method of Improving Performance in a Hierarchical Modulation System - A method is provided for enhancing a legacy satellite digital radio audio service (SDARS) by overlaying a hierarchically modulated data stream on a base layer (legacy) data stream and improving the synchronization of the received signal in which an overlay layer frame is synchronized to a base layer frame. The base layer frame includes additional data that is used to synchronize the receivers to demodulate and decode the overlay layer and the base layer. The additional data is modulated using a technique that aids the receiver in synchronizing the received signal that is different from the overlay layer. | 02-14-2013 |
20130083867 | TRANSMIT DIVERSITY FOR PRE-CODED RADIO CONTROL SIGNALS - A method sends uplink control information from a user equipment to a serving node of a radio communications system by first encoding uplink control information bits into symbols. The encoded symbols are split into at least two groups of symbols for use to achieve diversity transmission. Each of the at least two groups of symbols are cyclically repeated to generate a repeated group for each of the at least two groups of symbols. Then the repeated groups are mapped each to different transmission ports of the user equipment for diversity transmission as uplink control information through a plurality of uplink transmission slots of an uplink subframe. | 04-04-2013 |
20130129020 | METHOD AND APPARATUS FOR CONSTANT ENVELOPE MODULATION - Certain aspects of the present disclosure relate to a method for modulating single carrier signals using constant envelope 2-CPM modulation and quasi-constant envelope filtered continuously rotated pseudo-PSK modulation in a wireless communication system. | 05-23-2013 |
20130136208 | SIGNAL GENERATION METHOD AND SIGNAL GENERATION DEVICE - A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device. | 05-30-2013 |
20130208830 | SWITCHED-LOAD RESONATING TRANSMITTER FOR PASSBAND POWER LINE COMMUNICATION - A switched-load, resonant transmitter (T | 08-15-2013 |
20130216002 | Dual-Stream Signal (SIG) Field Encoding with Higher Order Modulation - Signal (SIF) field capacity can be significantly increased by encoding SIG field data using two streams in accordance with a space-time block code (STBC) encoding scheme. Dual-stream SIG field encoding allows for the utilization of higher order modulation schemes, such as quadrature phase-shift keying (QPSK), which increases SIG field capacity. Dual-stream encoded SIG fields are transmitted using an omnidirectional beam to allow mobile stations to accurately decode the SIG field irrespective of their spatial location. | 08-22-2013 |
20130223567 | TRANSMISSION AND RECEPTION APPARATUS AND METHOD - A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band. A reception apparatus is provided, which includes a plurality of antennas that receive a plurality of OFDM modulation signals; a plurality of OFDM demodulators that transform the plurality of OFDM modulation signals to a plurality of reception signals using Fourier transform; an estimator that outputs a distortion estimation signal using one or more symbols for demodulation included in the plurality of reception signals; and a demodulator that compensates for distortion of the reception signals using the distortion estimation signal and demodulates a data symbol included in the reception signals. | 08-29-2013 |
20130243126 | METHOD AND APPARATUS FOR DATA TRANSMISSION USING MULTIPLE TRANSMIT ANTENNAS - A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay elements may be provided in antenna output channels, or with suitable code construction delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver MSLE or other decoding is used to decode the noisy received sequence. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions. | 09-19-2013 |
20130272450 | SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD - Disclosed herein is a signal processing apparatus including: a frequency multiplier configured to carry out an N-times frequency multiplication process on a modulated signal obtained as a result of an N phase shift keying modulation process in order to generate a multiplied frequency signal; and an oscillator configured to oscillate the multiplied frequency signal as an injected signal in order to generate a signal obtained by carrying out a by-N frequency division process on the multiplied frequency signal to serve as a reproduced carrier which is a carrier reproduced from the modulated signal. | 10-17-2013 |
20130272451 | APPARATUS AND METHOD OF TRANSMITTING HIERARCHICALLY MODULATED SIGNAL - An apparatus and a method of transmitting hierarchically modulated signals are provided. The present invention includes: a basic layer symbol generator generating a first layer signal; an enhancement layer symbol generator generating a second layer signal synchronized with the first layer signal and having different signal power; and a hierarchical modulator hierarchically modulating the first layer signal and the second layer signal, wherein the enhancement layer symbol generator performs constellation rotation rotating bundles configured as constellation points formed by the second layer signal based on constellation points of the first layer signal by a predetermined angle. According to the exemplary embodiment of the present invention, it is possible to improve the receiving performance of the second layer signals by applying the constellation rotation technology to the second layer signals in regards of the signal transmission system using the hierarchical modulation technology. | 10-17-2013 |
20130322567 | Generation and Application of a Sub-Codebook of an Error Control Coding Codebook - There is provided a method of encoding and decoding data using an error control code having a codebook G. The codebook G is a sub-codebook of a codebook P. Each codeword g in the sub-codebook G has an autocorrelation amplitude that is different from and higher than each correlation amplitude between g and each of the other codewords in the sub-codebook G. In one specific embodiment in which the codebook P is that of a Reed-Muller code, using G instead of P reduces the likelihood of the presence of more than one maximum correlation amplitude when computing the non-coherent decision metric during decoding. | 12-05-2013 |
20140029698 | TRANSMITTING APPARATUS AND METHOD FOR A DIGITAL TELECOMMUNICATION SYSTEM - A transmitting apparatus transmits signals in a digital telecommunication system and a synchronising method is used for synchronizing such signals at a receiving apparatus. The transmitting apparatus prepares for transmission of a reference symbol having at least two repetition patterns, whereby one of the at least two repetition patterns is phase-shifted in relation to the other repetition pattern, and a synchronizing mechanism in the digital telecommunication system uses the reference symbol once received for synchronization. The synchronizing mechanism uses a cross-correlation mechanism to cross-correlate at least one of the two repetition patterns within a correlation window having a predetermined length. | 01-30-2014 |
20140185708 | Single-Bit Direct Modulation Transmitter - Single-bit transmitter modulator having a digital pulse shaping filter configured to shape data pulses of an inphase signal and quadrature signal; an upsampling filter configured to increase the sample rate of the inphase signal and quadrature signal; a sigma-delta modulator providing a one-bit inphase output signal and a one-bit quadrature output signal; an inphase low-order analog low pass filter coupling the one-bit inphase output signal to an inphase channel input of a quadrature modulator, and a quadrature low-order analog low pass filter coupling the one-bit quadrature output signal to a quadrature channel input of a quadrature modulator; and, wherein the quadrature modulator is connected to a carrier signal generator and is configured to generate an inphase and quadrature modulated carrier. | 07-03-2014 |
20140254721 | TRANSMISSION APPARATUS, RECEPTION APPARATUS AND DIGITAL RADIO COMMUNICATION METHOD - A transmission method includes modulating a transmission signal using a modulation scheme selected from a plurality of modulation schemes, to generate a first symbol sequence and generating at least one second symbol including a pilot symbol generated using a PSK modulation scheme. The method includes changing an insertion interval of the second symbol to be inserted in the first symbol sequence, to generate a modulation signal and transmitting the modulation signal. The second symbol is configured for synchronization in a reception apparatus. | 09-11-2014 |
20140286455 | METHOD AND APPARATUS OF GENERATING PILOT SEQUENCE - A method of transmitting pilots id disclosed. The method of transmitting pilots includes transmitting pilots over N orthogonal frequency division multiplexing (OFDM) symbols, wherein a pilot at subcarrier k for OFDM symbol n is determined to have time varying characteristic, thereby to prevent the cause of spectral lines. | 09-25-2014 |
20140294122 | METHOD AND A DEVICE FOR DETERMINING AN EXTRINSIC INFORMATION - A device for detecting an estimated value for a symbol at a given time, which is supplied to a phase modulation and transmitted via a transmission channel with a time-variable phase, provides a unit for determining log weighting factors in a forward recursion, a unit for determining complex coefficients in a forward recursion, a unit for determining log weighting factors in a backward recursion, a unit for determining complex coefficients in a backward recursion, a unit for determining an extrinsic information, a unit for determining the phase factor with the maximal weighting factor in a forward recursion and a unit for determining the phase factor with the maximal weighting factor in a backward recursion. | 10-02-2014 |
20140321578 | EFFICIENT SIGNAL PROCESSING FOR RECEIVE AND TRANSMIT DBF ARRAYS - In a phased-array communications system with a distributed processing architecture, channelized beamforming is used to minimize sampling and computational requirements, as well as reduce the data rates required for the communication of data and control information between system components. A central processor within the phased array system performs parallelized synthesis of channelized beams to form beams composite beams in sub-bands that overlap multiple channels. The phased array system incorporates a flexible scheme for channelization, channelized beamforming, and synthesis so that any number of composite beams may be synthesized in parallel at any one time. The system is capable of simultaneously processing beams that occupy overlapping subbands, and does not require restriction on the bandwidths or center frequencies of the subbands which the beams occupy. | 10-30-2014 |
20140328434 | TRANSMITTER FRONT-END DEVICE FOR GENERATING OUTPUT SIGNALS ON BASIS OF POLYPHASE MODULATION - The invention relates to a transmitter front-end device for generating output signals representing a digital stream, wherein the device has at least one first input for a first input signal and at least one second input for a second input signal, with the first input signal and the second input signal representing a complex data signal of the digital stream and being intended to influence an output signal of the transmitter front-end device. Furthermore, the transmitter front-end device has at least one phase generation device which generates at least one additional phase signal on the basis of the first input signal and the second input signal, with at least 3 phase signals being outputted by the phase generation device with different phases with respect to each other, at least one modulator that is set up such that it generates a complementary phase signal pair from a received phase signal, with each of the at least 3 phase signals being processed by an associated modulator into a corresponding complementary phase signal pair. Furthermore, the transmitter front-end device has at least one frequency converter that is set up such that it converts phase signals of a complementary phase signal pair with a high-frequency signal in order to form an output signal. | 11-06-2014 |
20140328435 | METHOD OF TRANSMITTING AND RECEIVING DATA UNIT IN WIRELESS LOCAL AREA NETWORK SYSTEM AND APPARATUS FOR THE SAME - A method for transmitting a data unit, performed by a transmitting station, in a wireless local area network system is provided. The method includes generating a repeated bit sequence, generating an interleaved bit sequence by interleaving the repeated bit sequence, generating at least one symbol by modulating the interleaved bit sequence, generating at least one OFDM symbol by performing IDFT (Inverse Discrete Fourier Transform) on the at least one symbol and transmitting the at least one OFDM symbol. | 11-06-2014 |
20140341321 | TRANSMITTER AND TRANSMISSION METHOD THEREOF - A transmitter and a transmitting method thereof are provided. The transmitter is configured to generate a first symbol sequence which includes a plurality of first symbols in which adjacent symbols correspond to different users, modulate the first symbol sequence into a second symbol sequence which includes a plurality of second symbols in which every two adjacent symbols correspond to one of the first symbols, and transmit the second symbol sequence. The transmitter is also configured to generate a first symbol sequence which includes a plurality of first symbols corresponding to a user, modulate the first symbol sequence into a second symbol sequence which includes a specific symbol and a plurality of second symbols, and transmit the second symbol sequence. The specific symbol and one of the second symbols correspond to one of the first symbols. | 11-20-2014 |
20140355719 | METHOD AND DEVICE FOR PHASE ADJUSTMENT BASED ON CLOSED-LOOP DIVERSITY FEEDBACK - A mobile communications method, device, and system for adjusting a phase parameter in a diversity signal, based at least in part on phase feedback from a base station. While in uplink communication with a base station, a mobile device may receive a phase feedback signal from the base station. The mobile device may calculate a modified value of a phase parameter based on the phase feedback signal in order to transmit diversity signals with a gradual change in phase difference. The modified value may be between a phase parameter value indicated by the base station's phase feedback signal and a phase parameter value initially transmitted by the mobile device. | 12-04-2014 |
20150016570 | METHOD OF SIGNAL GENERATION AND SIGNAL GENERATING DEVICE - A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device. | 01-15-2015 |
20150043680 | Rhombic-QPSK Modulation for Improved Tolerance to Nonlinearity in Fiber Communication Systems - This invention proposes an alternative modulation format for channels that present improved performance when such channels co-propagate with existing intensity modulated channels. This modulation format is named Rhombic-QPSK (R-QPSK) and it is designed in such a way that it presents more tolerance to phase noise created by the nonlinear interaction with the legacy channels. | 02-12-2015 |
20150071385 | System and Method for Scrambling the Phase of the Carriers in a Multicarrier Communications System - A system and method that scrambles the phase characteristic of a carrier signal are described. The scrambling of the phase characteristic of each carrier signal includes associating a value with each carrier signal and computing a phase shift for each carrier signal based on the value associated with that carrier signal. The value is determined independently of any input bit value carried by that carrier signal. The phase shift computed for each carrier signal is combined with the phase characteristic of that carrier signal so as to substantially scramble the phase characteristic of the carrier signals. Bits of an input signal are modulated onto the carrier signals having the substantially scrambled phase characteristic to produce a transmission signal with a reduced PAR. | 03-12-2015 |
20150078487 | METHOD AND APPARATUS FOR CONSTANT ENVELOPE MODULATION - Certain aspects of the present disclosure relate to a method for modulating single carrier signals using constant envelope 2-CPM modulation and quasi-constant envelope filtered continuously rotated pseudo-PSK modulation in a wireless communication system. | 03-19-2015 |
20150092888 | APPARATUS FOR TRANSMITTING AND RECEIVING A SIGNAL AND METHOD THEREOF - An transmitting apparatus is provided. The transmitting apparatus includes a modulator which performs a QPSK-modulation for original data by using a different constellation combination pattern by predetermined unit, and a transmitter which transmits the QPSK-modulated data. Accordingly, BEP performance may be improved by transmitting additional data according to a constellation combination patter in hidden form. | 04-02-2015 |
20150117570 | SIDEBAND SUPPRESSION IN ANGLE MODULATED SIGNALS - In an angle modulated radio transmitter, the total power is the same when modulated or unmodulated. Angle modulation produces multiple sideband pairs. The power in the sidebands is derived from the carrier. When a complex modulating waveform is used, the power (and therefore the amplitude) of the carrier varies. A system and method is provided for dramatically minimizing, to nearly zero, the bandwidth needed to transmit digital information using sideband suppression of angle modulated signals. The systems described use various techniques to suppress sideband pairs, leaving the carrier signal. The amplitude variations of the carrier are used to convey information. In some examples, techniques are used to filter and/or phase out one or more sideband pairs, leaving the carrier signal. | 04-30-2015 |
20150304094 | Dynamic Polarization Modulation and Control - A method for sending a data from an electromagnetic radiator by polarization modulation of an electromagnetic wave includes radiating from the radiator first and second electromagnetic waves including first and second polarizations respectively, the first polarization being different than the second polarization. The first and second electromagnetic waves form a third electromagnetic wave having a third polarization different from the first or second polarization. The method includes modulating the third polarization responsive to the data by modulating one or more parts of the third electromagnetic wave. The data is sent in the third polarization. A system for sending a data includes an oscillator adapted to generate an oscillating signal, and a phase shifter coupled to the oscillator and adapted to generate a first phase-shifted oscillating signal having a first phase. The phase shifter is adapted to vary the phase difference across a predefined range in response to the data. | 10-22-2015 |
20150312072 | APPARATUS AND METHOD FOR TRANSMITTING TAG - Disclosed are an apparatus and a method for transmitting a tag. The apparatus for transmitting a tag converts 2 bits of a plurality of bit data into one symbol using phase information and orthogonal information. The apparatus for transmitting a tag generates a sub-carrier signal by multiplying the symbol by a square wave having a faster period by a predetermined number of times than a period of the symbol, and transmits the sub-carrier signal to a reader | 10-29-2015 |
20150326418 | OFDM or OFDMA signaling for ranging and data - A communication device is operative to generate and orthogonal frequency division multiplexing (OFDM) symbol that includes one or more data and ranging modulation symbols. The data and ranging modulation symbols may be included within different sub-carriers of the OFDM symbol. The OFDM symbol is used to generate an OFDM symbol pair in the frequency domain (FDOM). After conversion from the FDOM to the time domain (TDOM), the OFDM symbol pair may then undergoes post-processing in the TDOM before transmission. Such post-processing may include the addition of cyclic prefix (CP) and cyclic suffix (CS) to the OFDM symbol pair in the TDOM as well as filtering using a window function. The OFDM symbol may be generated as an orthogonal frequency division multiple access (OFDMA) symbol, and two were more OFDM symbols or OFDMA symbols may be arranged in a frame. | 11-12-2015 |
20150326421 | METHOD, DEVICE AND COMPUTER PROGRAM FOR TRANSMITTING DATA TO AT LEAST ONE RECEIVER, AND METHOD, DEVICE AND COMPUTER PROGRAM FOR RECEIVING DATA TRANSMITTED BY A SOURCE - The present invention concerns a method for transmitting data to at least one receiver, data being decomposed in a first and a second streams. The method comprises the steps of: —identifying, from a first number of bits of the first stream, a cluster of constellation points among clusters of constellation points of an amplitude phase shift keying constellation, each cluster of constellation points being comprised in a respective circle sector of a first type, each circle sector of the first type being spaced from another circle sector of the first type by a circle sector of a second type, all circle sectors having the same central point, —identifying, from a second number of bits of the second stream, one constellation point out of the constellation points comprised in the identified cluster, —mapping the bits used for identifying to the identified constellation point of the identified cluster of constellation points, in order to form a symbol to be transmitted, —transmitting the symbol to the at least one receiver. | 11-12-2015 |
20150341202 | METHOD, DEVICE AND COMPUTER PROGRAM FOR TRANSMITTING DATA TO AT LEAST ONE RECEIVER, AND METHOD, DEVICE AND COMPUTER PROGRAM FOR RECEIVING DATA TRANSMITTED BY A SOURCE - The present invention concerns a method for transferring data to at least one receiver, data being decomposed in a first and a second streams. The method comprises the steps of: —identifying, from a first number of bits of the first stream, a cluster of constellation points among clusters of constellation points, each cluster of constellation points having the same number of points and being comprised in a respective region, each region being delimited by a pair of straight lines forming an angle of 2π/C where C is the number of clusters, —identifying, from a second number of bits of the second stream, one constellation point out of the constellation points comprised in the identified cluster, —mapping the bits used for identifying to the identified constellation point of the identified cluster of constellation points, in order to form a symbol to be transmitted, —transmitting the symbol to the at least one receiver. | 11-26-2015 |
20150358106 | Conveying metadata by modulation of pilot carriers in COFDM broadcasting - Transmitter apparatus transmits metadata together with data, at least part of which metadata specifies the version of coded orthogonal frequency-division modulation (COFDM) broadcasting standard it uses for transmitting. Some of the metadata is conveyed by prescribed signature modulation of pilot carrier waves dispersed in one or another of prescribed patterns among the COFDM carrier waves that convey interleaved forward-error-correction coded digital signals. Receiver apparatus detects that metadata by searching for a prescribed signature modulation of the continual pilot carrier waves in those transmissions. Preferably, Barker modulation of the continual pilot carriers near the conclusion of each COFDM frame signals the start of the next COFDM frame to the receiver apparatus. | 12-10-2015 |
20150381392 | OPTIMIZED RECEIVERS FOR FASTER THAN NYQUIST (FTN) TRANSMISSION RATES IN HIGH SPECTRAL EFFICIENCY SATELLITE SYSTEMS - An approach is provided for increasing transmission throughput rates for a source signal transmitted over a wireless channel, applying faster-than-Nyquist (FTN) signaling rates combined with tight frequency roll-off to the a source signal. A receiver is provided that compensates for ISI effects induced by the FTN rate and tight frequency roll-off, where the complexity of the receiver grows only linearly with the interference memory. The receiver comprises an equalizer configured to compensate for the ISI effects, and a decoder configured to decode the output of the equalizer to determine and regenerate the source signal. The receiver processes the received signal via a plurality of processing iterations. For one processing iteration, the decoder generates a set of a posteriori soft information based on the output of the equalizer, and the equalizer uses the a posteriori soft information as a priori soft information for a subsequent processing iteration. | 12-31-2015 |
20160006594 | A PHASE REFERENCE SYMBOL FORMAT FOR OFDM PHASE SYNCHRONIZATION - The present invention describes an orthogonal frequency-division multiplexing, OFDM, transmitter and a method for embedding phase reference symbols into an OFDM symbol. The invention comprises a single-carrier pre-processing unit arranged to receive phase reference symbols and provide pre-processed phase reference samples as output and an OFDM modulator arranged to receive data symbols and the pre-processed phase reference samples as input and map the data symbols to sub-carriers and embed the single-carrier samples into a frequency sub-band of the OFDM symbol. While the invention particularly relates to an OFDM communication system, it should be noted that it could be applicable to any type of multicarrier communication system. | 01-07-2016 |
20160050093 | METHOD FOR TRANSMITTING SIGNAL FIELD AND APPARATUS THEREFOR - Disclosed is a method for transmitting a signal field in a wireless LAN along with an apparatus therefore. The method for transmitting a signal field in a wireless LAN includes the steps of: generating a signal field by a first STA (station); and transmitting the signal field to a second STA by the first STA in a first OFDM (orthogonal frequency division multiplexing) symbol, a second OFDM symbol and a third OFDM symbol, wherein at least one of a second binary phase shift keying used in the second OFDM symbol and a third binary phase shift keying used in the third OFDM symbol can be rotated in reference to the first binary phase shift keying used in the first OFDM symbol. | 02-18-2016 |
20160105300 | TONE-PHASE-SHIFT KEYING: A NEW MODULATION SCHEME FOR SC-FDMA - A method of wireless communication by a user equipment includes determining an allocation of a set of tones in a symbol for conveying data. The method further includes determining to use m-ary phase shift keying (MPSK) to modulate the data onto a subset of tones of the set of tones. The method further includes modulating the data onto the subset of tones based on a mapping, wherein the mapping maps pairs of data values with a largest Hamming distance from each other to pairs of constellation points with a maximum Euclidean distance from each other. | 04-14-2016 |
20160197761 | MULTI-BAND INTERCONNECT FOR INTER-CHIP AND INTRA-CHIP COMMUNICATIONS | 07-07-2016 |
20180026817 | APPARATUS FOR ORTHOGONAL 16-QPSK MODULATED TRANSMISSION | 01-25-2018 |