51st week of 2009 patent applcation highlights part 29 |
Patent application number | Title | Published |
20090310619 | BANDWIDTH EFFICIENT WIRELESS NETWORK MODEM - A modem that provides efficient use of wireless network bandwidth in the presence of multiuser interference and noise is disclosed. The modem design provides for compatibility with existing network hardware and protocols so that new efficient modems may be added to the network without removing installed hardware and software. | 2009-12-17 |
20090310620 | COMMUNICATION APPRATUS FOR PERFORMING CONTENTION CONTROL - A communication apparatus, which improves the throughput of a whole communication system while performing contention distributed control which provides equality of a transmission chance by observing a medium occupation state, is provided. Thus, the communication apparatus according to the present invention comprises: a back-off process section for performing, using a contention window, a regular back-off process which is performed at transmission of a transmission frame and a pseudo back-off process which is performed in a pseudo manner when the transmission frame is not transmitted; a medium information obtaining section for obtaining, by the pseudo back-off process, medium information indicative of a state of the transmission line medium when the transmission frame is not transmitted; and a medium state determination section for determining the state of the transmission line medium using the medium information to obtain determination information. | 2009-12-17 |
20090310621 | Method to Classify the Network Speed - A method to classify the network speed disclosed is utilized to distinguish between an advanced-level user bandwidth and a general-level user bandwidth for users whose devices are connected by the access point. The method includes selecting a bandwidth-distribution rule of the access point, and distributing the total bandwidth supported by the access point according to the selected bandwidth-distribution rule. The bandwidth-distribution rule is selected from a ratio-distribution rule, a highest-band restriction rule, and a lowest-bandwidth restriction rule. The bandwidth distributed to each advanced-level user is larger than the bandwidth distributed to each general-level user. | 2009-12-17 |
20090310622 | Minimal GAN RTP packet length via multi-level header compression - The present invention involves a method for IP header compression for Real-Time Transport Protocol (RTP) packets that includes header compression for the outer IP layer that carries IPsec ESP tunnel traffic. The preferred embodiment of the invention involves a method of producing minimal VoIP packet size in a GAN user plane by defining an ESP/UDP/IP profile for ROHC; using the ESP/UDP/IP profile to compress the outer layers carrying IPsec ESP tunnel traffic in the GAN user plane; and using a ROHC RTP/UDP/IP profile between IPsec ESP tunnel endpoints for additional compression. | 2009-12-17 |
20090310623 | Method and device for transmitting information over a complex network - The method of the invention comprises firstly prior allocation of an identifier to each module that might be concerned by the messages transmitted over the network, and when the module is installed on the network, associating said identifier with data relating to the geographical position of the location where the module is installed, in such a manner as subsequently to be able to identify the location of the module independently of its position in the network, and secondly, when sending a message over the network to a module, the modules that are capable of receiving the message, recognizing said message, and modules that have received the message systematically and synchronously repeating said message until the message has been transmitted over the entire network and all of the modules have received and re-sent the message at least once. | 2009-12-17 |
20090310624 | System and method for receiving multiple channels - The disclosed embodiments relate to a system and method for receiving multiple channels in a communications receiver. The system includes a first module further including an analog to digital converter for converting an input signal to a first and second digital signal and a first processor for processing the first digital signal, and a second module further including a second processor to process the second digital signal. The method involves receiving an analog signal, converting the analog signal to a first and second digital signal, passing the first digital signal through a first interface, processing the first digital signal to a produce a first plurality of output signals, passing the second digital signal through a second interface, and processing the second digital signal to produce a second plurality of output signals. | 2009-12-17 |
20090310625 | METHOD FOR DISTRIBUTING A COMMON TIME REFERENCE WITHIN A DISTRIBUTED ARCHITECTURE - A method of distributing a common time reference within a distributed architecture includes one or more of the following: generating at least one electrical pulse at a central entity; distributing the at least one electrical pulse to a subassembly; receiving the at least one electrical pulse at the subassembly; recording a reception counter value corresponding to a value of a local frequency counter when the at least one electrical pulse is received at the subassembly; querying the central entity to obtain a generation time value corresponding to a time at which the at least one electrical pulse was generated; and determining a global time value using the generation time value, the reception counter value, and a current counter value of the local frequency counter. | 2009-12-17 |
20090310626 | DATA ALIGNMENT SYSTEM AND METHOD FOR DOUBLE DATA RATE INPUT DATA STREAM - Methods and apparatus are provided for a system for aligning data. The apparatus comprises a data processing component adapted to produce a plurality of processed data streams delayed by a successively increasing number of clock cycles, a plurality of sequence detection components coupled to the data processing component, each of the plurality of sequence detection components adapted to inspect its input data stream for a predetermined sequence of bits, and a data selecting component adapted to receive the plurality of processed data streams, to select one of the plurality of processed data streams in response to receiving an indicator from a corresponding sequence detection component. | 2009-12-17 |
20090310627 | LASER FOR PROVIDING PULSED LIGHT AND REFLECTOMETRIC APPARATUS INCORPORATING SUCH A LASER - A laser for generating laser light pulses comprises a cavity containing an active optical gain medium ( | 2009-12-17 |
20090310628 | FIBER LASER PROCESSING METHOD AND FIBER LASER PROCESSING APPARATUS - A fiber laser processing apparatus controls a LD drive current | 2009-12-17 |
20090310629 | Optical locking based on optical resonators with high quality factors - Techniques and devices for providing optical locking of optical resonators and lasers. | 2009-12-17 |
20090310630 | SEMICONDUCTOR INTEGRATED DEVICE - A semiconductor integrated device includes a plurality of wavelength tunable lasers, provided on a semiconductor substrate, and having oscillation wavelength ranges different from each other. Each of the wavelength tunable lasers includes an optical waveguide including, alternately in an optical axis direction, a gain waveguide portion and a wavelength controlling waveguide portion, and a diffraction grating provided over both the gain waveguide portion and the wavelength controlling waveguide portion. A value obtained by dividing a width of the wavelength controlling waveguide portion by a width of the gain waveguide portion in one of the plurality of wavelength tunable lasers is larger than a value obtained by dividing a width of the wavelength controlling waveguide portion by a width of the gain waveguide portion in a different one of the wavelength tunable lasers, which oscillates on a shorter wavelength side with respect to an oscillation wavelength range of the one wavelength tunable laser. | 2009-12-17 |
20090310631 | High-Repetition-Rate Guided-Mode Femtosecond Laser - Femtosecond pulse trains in waveguide lasers with high fundamental repetition rates are achieved by exploiting the nonlinearity in the waveguide. Components of the apparatus include an optical resonator, a saturable absorber for starting and stabilizing mode-locking, and a gain element. Part of the laser cavity or the entire laser cavity is made of waveguide or fiber (collectively called “waveguide” herein). The net dispersion of the laser cavity can be anomalous. This anomalous dispersion in combination with the positive self-phase modulation nonlinearity in the waveguide creates soliton formation to shorten the pulse duration in the invented lasers. Conversely, a normal dispersive waveguide with negative self-phase modulation nonlinearity can also be used. | 2009-12-17 |
20090310632 | SURFACE EMITTING LASER ELEMENT, SURFACE EMITTING LASER ARRAY, OPTICAL SCANNING DEVICE, AND IMAGE FORMING APPARATUS - In a surface emitting laser element, on an inclined substrate, a resonator structural body including an active layer, and a lower semiconductor DBR and an upper semiconductor DBR sandwiching the resonator structural body are stacked. A shape of a current passing-through region in an oxide confinement structure of the upper semiconductor DBR is symmetrical to an axis passing through a center of the current passing-through region parallel to an X axis and symmetrical to an axis passing through the center of the current passing-through region parallel to a Y axis, and a thickness of an oxidized layer surrounding the current passing-through region is greater in the +Y direction than in the +X and −X directions. An opening width of a light outputting section in the X axis direction is smaller than another opening width of the light outputting section in the Y axis direction. | 2009-12-17 |
20090310633 | PULSE WIDTH MODULATION SIGNAL GENERATING DEVICE, IMAGE DISPLAY APPARATUS INCLUDING PULSE WIDTH MODULATION SIGNAL GENERATING DEVICE, AND PULSE WIDTH MODULATION SIGNAL GENERATING METHOD - A pulse width modulation signal generating device which generates a pulse width modulation signal for modulating laser beam according to image data includes: a cycle signal output circuit which outputs a cycle signal having a cycle corresponding to a drawing rate for drawing the image data by the laser beam; and a pulse width modulation circuit which receives supply of the image data and the cycle signal and modulates a pulse wave having a cycle determined by the cycle signal by changing duty ratio of the pulse wave based on the image data to produce the pulse width modulation signal. | 2009-12-17 |
20090310634 | STABILIZED LASER SOURCE WITH VERY HIGH RELATIVE FEEDBACK AND NARROW BANDWIDTH - This invention relates to the stabilization of a laser source used in opto-electronics, specifically a source comprising a semiconductor laser diode. Such laser sources are often used as so-called pump lasers for fiber amplifiers in the field of optical communication, erbium-doped fiber amplifiers being a prominent example. Such lasers are usually designed to provide a narrow-bandwidth optical radiation with a stable power output in a given frequency band. The present invention now concerns such a laser source using external reflector means, preferably consisting of one or more appropriately designed fiber Bragg gratings, providing very high relative feedback with an extremely narrow bandwidth, combined with a very long external cavity encompassing about 100 modes or more and an extremely low front facet reflectivity of the laser diode. Also, the FWHM bandwidth of the external reflector is selected to be significantly smaller than the distance between the modes within the laser diode. This stabilizes the laser source extremely well in its operation, even without an active temperature stabilizing element. | 2009-12-17 |
20090310635 | WAVELENGTH LOCKER AND LASER PACKAGE INCLUDING SAME - A wavelength locker may include a first optical detector configured to detect light, wherein the first optical detector is at least partially transparent to the light. The wavelength locker may further include an optical interferometer optically coupled to the first optical detector and to a second optical detector. The optical interferometer is configured to selectively filter the light that passes through the first optical detector and the second optical detector detects the filtered light. An optical module or package may include the wavelength locker coupled to a laser for locking an emission wavelength of the laser. | 2009-12-17 |
20090310636 | LIGHT INTENSITY BOOST FOR SUBPIXEL ENHANCEMENT - Techniques are disclosed that enable fine features such as serifs and narrow strokes of texts to be produced by xerographic devices, for example. The fine features may be generated by subpixels which are produced when a pulse width used to image a pixel is shorter than a corresponding physical size of a laser beam spot used to write the image on a Xerographic photoreceptor. The laser driver may be modified to drive a light emitting element with a boost current profile that includes an overshoot above a steady state current at a rising edge. The overshoot results in a light intensity time profile that has an increased area for a subpixel. | 2009-12-17 |
20090310637 | SURFACE EMITTING LASER ELEMENT AND METHOD OF FABRICATING THE SAME - A convex-portion forming layer is formed between a current-confinement aperture and a multilayer mirror, and forms a convex portion on each boundary between layers forming the multilayer mirror. The convex portion includes a plane equal to or larger than a spot size of the laser light, where the spot size is decided by a diameter of the current-confinement aperture, a predetermined diffraction angle of the laser light due to the current-confinement aperture, and a distance from the current-confinement aperture. | 2009-12-17 |
20090310638 | SEMICONDUCTOR LASER DEVICE - In a semiconductor laser device, a first lead has a mounting portion for mounting a semiconductor laser element on its top surface via a submount member, and a lead portion extending from the mounting portion. Given that a direction in which a primary beam is emitted from the laser element is defined as a forward direction, and that a direction vertical to the forward direction and parallel to the top surface of the mounting portion is defined as a lateral direction, the first lead has, in one region of a side face of the mounting portion, a lateral reference surface which is parallel to a side face of the semiconductor laser element and flat. In the one region of the side face of the mounting portion, a recess portion is formed adjacent to the lateral reference surface. | 2009-12-17 |
20090310639 | LASER DEVICE - A cascade laser device, including a multilayer film structure with a multiple quantum well including a potential barrier and a quantum well; and an electric field applying portion for applying an electric field to the multilayer film structure. The multilayer film structure includes at least two first regions and a second region. The second region is sandwiched between the two first regions; each of the first regions includes multiple sub-bands. When the electric field is applied, carriers are transported from a sub-band in the higher energy quantum well to a sub-band in the lower energy quantum well via the potential barrier in the first regions by tunneling permitted by interaction with light. The second region is thinner than twice a skin depth of the light and includes at least a film having an energy band. The carriers are subjected to energy relaxation in the energy band. | 2009-12-17 |
20090310640 | MOCVD GROWTH TECHNIQUE FOR PLANAR SEMIPOLAR (Al, In, Ga, B)N BASED LIGHT EMITTING DIODES - A III-nitride optoelectronic device comprising a light emitting diode (LED) or laser diode with a peak emission wavelength longer than 500 nm. The III-nitride device has a dislocation density, originating from interfaces between an indium containing well layer and barrier layers, less than 9×10 | 2009-12-17 |
20090310641 | LASER LIGHT SOURCE, PLANAR LIGHT SOURCE, AND LIQUID CRYSTAL DISPLAY DEVICE - A laser light source, a surface light source and a liquid crystal display apparatus that can reduce speckle without relying upon mechanical vibrations. The laser light source ( | 2009-12-17 |
20090310642 | MULTIPLE SENSOR FIBER OPTIC SENSING SYSTEM - A multiple sensor fiber optic sensing system. A method of sensing distributed temperature and at least another property in a well includes the steps of: interconnecting an optical switch to an optical fiber which extends along a wellbore in the well; operating the optical switch to optically connect the optical fiber to an interferometric measurement system; and operating the optical switch to optically connect the optical fiber to a distributed temperature measurement system. Another method includes the steps of: installing an optical fiber along a wellbore in the well, the optical fiber being a first distributed temperature sensor, the installing step including providing a substantial length of the optical fiber proximate a second sensor which senses the well property; and calibrating the second sensor using a temperature sensed by the first sensor in the substantial length of the optical fiber. | 2009-12-17 |
20090310643 | Methods and Apparatus for Thin Metal Film Thickness Measurement - A method for measuring a metal film thickness is provided. The method initiates with heating a region of interest of a metal film with a defined amount of heat energy. Then, a temperature of the metal film is measured. Next, a thickness of the metal film is calculated based upon the temperature and the defined amount of heat energy. A chemical mechanical planarization system capable of detecting a thin metal film through the detection of heat transfer dynamics is also provided. | 2009-12-17 |
20090310644 | THERMOANALYTICAL INSTRUMENT - A thermoanalytical instrument, and especially a differential scanning calorimeter, has first and second measurement positions, a heater and a temperature sensor associated with each of the measurement positions, and a controller. The controller, which has an associated means for setting a predetermined temperature program, controls a heating power of the first heater to cause the temperature measured at the first position to follow the temperature program. The controller also controls both heaters to eliminate any temperature difference between the measured first and second temperatures. The controller also provides a means for determining the lower of the measured first and second measured temperatures and applies additional power to the heater associated with that lower measured temperature. | 2009-12-17 |
20090310645 | SAMPLE TEMPERATURE CONTROL METHOD - A method of stably controlling the temperature of a sample placed on a sample stage to a desired temperature by estimating a sample temperature accurately, the sample stage including a refrigerant flow path to cool the sample stage, a heater to heat the sample stage, and a temperature sensor to measure the temperature of the sample stage. This method comprises the steps of: measuring in advance the variation-with-time of supply electric power to the heater, temperature of the sample, and temperature of the temperature sensor, without plasma processing; approximating the relation among the measured values using a simultaneous linear differential equation; estimating a sample temperature from the variation-with-time of sensor temperature y | 2009-12-17 |
20090310646 | METHOD FOR OPERATING A CALORIMETER - A method for operating a calorimeter and a calorimeter that is operable to perform the method, wherein the calorimeter has a reactor ( | 2009-12-17 |
20090310647 | Rapid and Easy Bottle Test - A method for predicting the drop impact resistance of a stretch-blow moulded polypropylene container which comprises the steps of measuring the initial size of the container, placing it in an oven, remeasuring its size after removing it from the oven, calculating the percentage difference in size of the container and determining its drop impact resistance, which is proportional to said difference. | 2009-12-17 |
20090310648 | METHOD AND DEVICE FOR DETERMINING THE TEMPERATURE OF A SUBSTRATE - The publication discloses a method for determining a temperature of a substrate, comprising: providing a gas channel that is confined by at least one wall having a certain wall temperature; providing a substrate in said gas channel, proximate to the at least one wall, such that a gap exists between a surface of the substrate and the at least one wall; providing a gas flow with a certain mass flow rate through said gas channel, which gas flow extends at least partially through said gap; determining a pressure drop in the gas flow along the gas channel; and deriving from said pressure drop the temperature of said substrate using a pre-determined relation between the pressure drop along the gas channel, the wall temperature and the temperature of the substrate, at said mass flow rate. Also disclosed is a device for implementing the disclosed method. | 2009-12-17 |
20090310649 | System And Method For Fast Acquisition Of Ultra Wideband Signals - An ultra wideband system employing a threshold to detect signal quality during acquisition wherein the threshold is adjusted based on signal characteristics such as packet traffic rate, packet loss rate, and packet loss fraction. In one embodiment, the threshold is adjusted by adjusting the gain of a variable gain stage ahead of the threshold. In another embodiment, gain and threshold are adjusted in a coordinated manner wherein gain is adjusted for low signal levels and threshold is adjusted for high signal levels. In one embodiment, packet traffic rate is evaluated over an interval based on maximum packet length, number of monitor packets, and inter-packet delay. In a further embodiment, multiple ramp builders are operated in parallel at multiple code offset values to generate signal statistics to compare with the threshold. Embodiments are disclosed wherein the thresholds are adaptively adjusted based on signal performance characteristics or the multipath environment. | 2009-12-17 |
20090310650 | FEATURELESS COHERENT CHAOTIC AMPLITUDE MODULATION | 2009-12-17 |
20090310651 | SPREAD-SPECTRUM RECEIVER AND RECEPTION METHOD - Receivers and reception methods conduct spread spectrum reception using the energy of multiple bits, preferably a substantial number of bits, in a packet for correct alignment of the spreading code at the receiver. Code acquisition, as well as packet detection and acquisition are provided by embodiments of the invention. Preferred embodiment receivers and reception methods provide packet detection at low SINR looking at energy of multiple bits of the packet, frame synchronization using short preamble, timing recovery at low SINR looking at energy of multiple bits of the packet, quick code acquisition using parallel search for all possible code phases, code acquisition at low SINR, and tracking of acquired timing and code phase. Preferred embodiment receivers and reception methods use the energy of multiple bits for making decisions. | 2009-12-17 |
20090310652 | BASE STATION HAVING A SET OF PHASED ARRAY ANTENNAS - A wireless communications handset configured to receive a multipath spread spectrum signal comprises a first antenna and a second antenna. A first receiver is coupled to the first antenna and a second receiver is coupled to the second antenna. A delay device is coupled to the first receiver and delays the portion of the multipath signal received by the first antenna. The delayed signal and the in-phase portion of the signal are then combined in a combining device. A despreader coupled to the combining devices generates a magnitude value of the combined signal. The current magnitude value is then compared to one or more previous magnitude values to determine if the delay should be increased or decreased. A comparison device outputs a comparison signal based on the current and previous magnitude values and provides the comparison signal to the delay device to adjust the delay appropriately. | 2009-12-17 |
20090310653 | HYBRID POLYPHASE AND JOINT TIME-FREQUENCY DETECTION - A demodulator ( | 2009-12-17 |
20090310654 | MULTIPLE CORRELATION PROCESSING IN CODE SPACE SEARCH - Methods and apparatus for code phase processing in a wireless communication device are described herein. A wireless device performs code phase search on a pseudo random code spread signal received over a wireless channel. A correlator correlates the received signal to a plurality of code phases in each of a plurality of frequency hypothesis. A maximum peak and a second peak are determined from the correlation results. Cross correlation processing is performed on the maximum peak and the maximum peak is discarded in favor of the second peak for position processing based on the results of the cross correlation. | 2009-12-17 |
20090310655 | SEARCH FREQUENCY CORRECTION METHOD, POSITIONING METHOD, PROGRAM, AND RECEIVING APPARATUS - A search frequency correction method includes: obtaining correlation values by correlating between a received signal that is modulated by direct sequence spread spectrum modulation and a replica code of a spread code with respect to I and Q components at a predetermined search frequency, obtaining accumulated correlation values by accumulating the correlation values of each polarity inversion interval with respect to the I and Q components, calculating a plurality of combinations of the accumulated correlation values in both signs, selecting one of the combinations based on the calculation results of the respective combinations, and correcting the search frequency based on a time variation of an IQ phase represented by the accumulated correlation values of the one of the combinations. | 2009-12-17 |
20090310656 | COMMUNICATION SYSTEM AND TECHNIQUE USING QR DECOMPOSITION WITH A TRIANGULAR SYSTOLIC ARRAY - An apparatus, system, and method to perform QR decomposition of an input complex matrix are described. The apparatus may include a triangular systolic array to load the input complex matrix and an identity matrix, to perform a unitary complex matrix transformation requiring three rotation angles, and to produce a complex unitary matrix and an upper triangular matrix. The upper triangular matrix may include real diagonal elements. Other embodiments are described and claimed. | 2009-12-17 |
20090310657 | Method for Low Power Communication Encoding - In accordance with a low power communication encoding method a first piece of encoded information and a second piece of encoded information are generated based on a comparison of a current transmission record and a previous transmission record, then transmission data is selected based on which of the first and second pieces of encoded information will result in transmitting a fewer number of logical lows. Ultimately, the transmission data is transmitted on an open drain data line. | 2009-12-17 |
20090310658 | Systems and Methods for Positioning and Messaging of Reserved Tones for Peak-to-Average Ratio (PAR) Reduction in DSL Systems - Systems and methods for reducing the peak-to-average ratio (PAR) at the transmitter can reduce the dynamic range required in various analog components. PAR can be reduced by applying a time-domain compensation signal which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique. | 2009-12-17 |
20090310659 | Adaptive Turbo Peak Mitigation for Peak-to-Average Ratio (PAR) Reduction Using Reserved Tones - Systems and methods for reducing the peak-to-average ratio (PAR) at the transmitter can reduce the dynamic range required in various analog components. PAR can be reduced by applying a time-domain compensation signal which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique. | 2009-12-17 |
20090310660 | SYSTEM AND METHOD FOR DETERMINING A SUITABLE IMPEDANCE FOR A MODEM - A system includes a plurality of modules which are configured for determining a suitable impedance for a modem. The plurality of modules send signals with a plurality of signal frequencies to a telephone and receive feedback signals from the telephone under each of a plurality of impedances of the modem, compute a total decibel value of the feedbacks under each impedance, and determine a suitable impedance according to a minimum total decibel value from the plurality of total decibel values. | 2009-12-17 |
20090310661 | Capturing and Using Radio Events - In one embodiment a method includes, collecting in-phase/quadrature (I/Q) data representing energy detected by a radio in a frequency band, performing a fast Fourier transform (FFT) on the I/Q data resulting in a stream of FFT blocks, identifying using the stream of FFT blocks a pulse in the frequency band, recording in a radio events record (RER) a plurality of radio events and corresponding timestamps that are indicative, respectively, of a type and time of individual state changes in the radio during the collecting step, and, for example, using at least two of the radio events to identify, in the time domain, a beginning time and end time of the pulse detected in the stream of FFT blocks. | 2009-12-17 |
20090310662 | RECEIVING SYSTEM - A receiving system including a first apparatus and a second apparatus, the first apparatus and the second apparatus being connected through a transmission line, where the first apparatus includes an amplifier that amplifies a received signal, the signal amplified being transmitted to the second apparatus, a converting unit that reflects a pilot signal transmitted from the second apparatus through the transmission line and changes characteristics, and a control unit that controls the converting unit based on information obtained by monitoring the amplifier; and the second apparatus includes a pilot output unit that outputs the pilot signal, and a monitoring unit that monitors the first apparatus based on a level of a synthesized signal synthesized from the pilot signal output from the pilot output unit and a reflected signal that is from the first apparatus and includes the pilot signal reflected at the converting unit. | 2009-12-17 |
20090310663 | SYSTEMS AND METHODS FOR DATA STREAMING - A method performed by a network device may include determining a transmission bit rate associated with a content, determining a bit rate of a network, determining a number of data streams to be transmitted through the network based on the determined bit rate, where a combined bit rate of the number of data streams is equal to or greater than the determined transmission bit rate, receiving the number of data streams transmitted through the network and reassembling the number of data streams to provide a single data stream of the content. | 2009-12-17 |
20090310664 | Surface rf emitter passive ranging accuracy confirmation algorithm - Kalman gain is used to calculate range accuracy for a passive angle-of-arrival determining systems, most notably for short-baseline interferometry, in which Kalman gain after arriving at a minimum proceeds to within a predetermined fraction or percent of zero gain, at which time the range estimate accuracy is known. | 2009-12-17 |
20090310665 | Methods and Systems for Digitally Processing Optical Data Signals - Digital signal processing based methods and systems for receiving electrical and/or optical data signals include electrical receivers, optical receivers, parallel receivers, multi-channel receivers, timing recovery schemes, and, without limitation, equalization schemes. The present invention is implemented as a single path receiver. Alternatively, the present invention is implemented as a multi-path parallel receiver in which an analog-to-digital converter (“ADC”) and/or a digital signal processor (“DSP”) are implemented with parallel paths that operate at lower rates than the received data signal. | 2009-12-17 |
20090310666 | ADAPTIVE EQUALIZER CIRCUIT - An adaptive equalizer circuit includes an equalizer circuit configured to produce an output data signal in response to an equalizing factor, a data detecting circuit configured to detect a signal level of the output data signal in a given unit time at predetermined timing, a boundary detecting circuit configured to detect a signal level of the output data signal at a timing that is ½ unit time away from the predetermined timing, and a control unit configured to detect, multiple times, a pattern having consecutive data items of a first value followed by a data item of a second value, and to adjust the equalizing factor such that a data detection value and a boundary detection value obtained for the data item of the second value are equal to each other a certain percentage of times, and are different from each other substantially the same percentage of times. | 2009-12-17 |
20090310667 | PHASE CONTROL BLOCK FOR MANAGING MULTIPLE CLOCK DOMAINS IN SYSTEMS WITH FREQUENCY OFFSETS - A circuit for performing clock recovery according to a received digital signal ( | 2009-12-17 |
20090310668 | METHOD, APPARATUS AND SYSTEM FOR CONCURRENT PROCESSING OF MULTIPLE VIDEO STREAMS - A system apparatus and method for concurrent delivery of a plurality of video streams comprising one or more transcoders for bitrate reduction and a cache memory to save copies of transcoded segments. When the total outgoing bitrate of the system exceeds a predefined threshold, the system decides which of the video segments to transcode and the magnitude of bitrate reduction. Before assigning a transcoder for the bitrate reduction, the system first checks the cache for saved transcoded segments. If appropriate transcoded segments are not found in cache, the system may assign a transcoder for the video segments designated for bitrate reduction. | 2009-12-17 |
20090310669 | Bitstream conversion method, bitstream conversion apparatus, bitstream connecting apparatus, bitstream splitting program, bitstream conversion program, and bitstream connecting program - A bitstream conversion apparatus for converting a bitstream of a first format, containing content data, into a bitstream of a second format includes: a splitting unit which splits the bitstream of the first format in time sequential fashion into a plurality of split bitstreams of the first format; a plurality of conversion units which convert the plurality of split bitstreams of the first format into a plurality of split bitstreams of the second format; and a connecting unit which connects the plurality of split bitstreams of the second format to one another. | 2009-12-17 |
20090310670 | INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, AND PROGRAM - An information processing system for performing processing of dividing a moving image into tiles and packetizing and outputting information corresponding to each tile includes a process time measuring packet generation unit adapted to generate and transmit a process time measuring packet in which a packet sending time is set to measure a packet process time, a packet process time measuring unit adapted to measure, based on the packet sending time set in the process time measuring packet and the reception time of the process time measuring packet, the packet process time necessary for processing a packet, a determination unit adapted to determine, based on the packet process time, the timestamp of the moving image divided into the tiles, and a packetization unit adapted to execute processing of packetizing and outputting the timestamp and the information of the moving image divided into the tiles. | 2009-12-17 |
20090310671 | SYSTEM AND METHOD FOR COMPRESSING PORTIONS OF A MEDIA SIGNAL USING DIFFERENT CODECS - An input module obtains a media signal to be communicated to a destination system, after which an identification module identifies a plurality of scenes within the media signal. A selection module automatically selects different codecs from a codec library to respectively compress at least two of the scenes. The codecs are automatically selected to produce a highest compression quality for the respective scenes according to a set of criteria without exceeding a target data rate. A compression module then compresses the scenes using the automatically selected codecs, after which an output module delivers the compressed scenes to the destination system with an indication of which codec was used to compress each scene. | 2009-12-17 |
20090310672 | Method and System for Rate Control in a Video Encoder - A method and system for a rate control block that adjusts the Quantization Parameter (QP) for a frame or macroblock based on the number of bits already used in encoding the frame or macroblock is disclosed. In an embodiment of the invention, the QP for a macroblock is adjusted dynamically against the QP for a frame as a function of the buffer occupancy. In another embodiment of the invention, a range of allowable QPs are defined based on the buffer occupancy. Embodiments of the invention are applicable to H.264 high-definition video conferencing. | 2009-12-17 |
20090310673 | METHOD AND APPARATUS FOR CONTROLLING A BITRATE IN A VIDEO PROCESSING SYSTEM - The present invention relates to a method and apparatus for controlling a bitrate used in video encoding to ensure quality of a targeted video in a video processing system. The apparatus may include a bitrate analyzer to determine a minimum bitrate satisfying a target video quality designated for each frame and/or scene, and an encoder to encode each frame using determined bitrates for each frame and/or scene. | 2009-12-17 |
20090310674 | METHOD AND DEVICE FOR CODING A SEQUENCE OF IMAGES - The method of coding a sequence of images comprising at least one group of a plurality of original images, in several scalability layers, comprises, to code said group of original images, a step of coding at least one base layer on the basis of the group of original images to code to constitute an intermediate data stream. | 2009-12-17 |
20090310675 | VIDEO ENCODING METHOD, VIDEO DECODING METHOD, VIDEO ENCODING APPARATUS, VIDEO DECODING APPARATUS, VIDEO ENCODING PROGRAM, AND VIDEO DECODING PROGRAM - A video processing system is provided with video encoding apparatus | 2009-12-17 |
20090310676 | PROCESSING MULTIVIEW VIDEO - Decoding a multiview video signal comprises receiving a bitstream comprising the multiview video signal encoded according to dependency relationships between respective views, and view-dependency information representing the dependency relationships in a two-dimensional data structure; extracting the two-dimensional data structure and determining the dependency relationships from the extracted data structure; and decoding the multiview video signal according to the determined dependency relationships. | 2009-12-17 |
20090310677 | IMAGE ENCODING AND DECODING METHOD AND APPARATUS - An image encoding apparatus includes a first selector selecting a prediction-order to sub-blocks obtained by further dividing pixel-blocks obtained by dividing a frame of an input-image-signal from predetermined prediction-orders, a second selector selecting, from prediction-modes regulating a manner of referring to an encoded-pixel when a first-prediction-signal of each-sub-block is generated with reference to the encoded-pixel, the number of prediction-modes used in prediction of the first-prediction-signal, a third selector selecting prediction-modes the number of which is the selected number from prediction-modes to use the prediction-modes in prediction of the first-prediction-signal, a generator generating the first-prediction-signal in the selected prediction order by using the selected prediction-modes the number of which is the selected number to generate a second-prediction-signal corresponding to the pixelblock, and an encoder encoding a prediction-residual-error-signal expressing a difference between an image-signal of the pixel-block and the second-prediction-signal to generate encoded data obtained by the prediction-encoding. | 2009-12-17 |
20090310678 | IMAGE ENCODING APPARATUS, METHOD OF CONTROLLING THE SAME AND COMPUTER PROGRAM - An image encoding apparatus that performs intra-frame predictive encoding is provided. The apparatus includes a partitioning unit configured to partition an inputted macroblock into blocks as processing units, an encoding unit configured to encode each of blocks to be processed using a prediction value for each pixel contained in the block to be processed, the prediction value being calculated by referring to pixels contained in other blocks, and a sorting unit configured to sort the encoded blocks in a predetermined encoding order. The encoding unit starts encoding in an order in which the first block for which all the pixels to be referred to are available for calculation of the prediction value is the first to be encoded, and the encoding is performed by pipeline processing. | 2009-12-17 |
20090310679 | VIDEO PROCESSING APPARATUS AND METHODS - A video processing apparatus is provided for interpolating frames between two frames. The video processing apparatus includes a motion estimation unit, a region detector and a motion compensation unit. The motion estimation unit receives the two frames and provides motion vector information of the two frames. The region detector generates boundary information associated with image boundaries of the two frames, determines a specific region in the two frames according to the boundary information and generates region information according to the determination result. The motion compensation unit generates an interpolated frame between the two frames in accordance with the region information and the motion vector information. | 2009-12-17 |
20090310680 | Method and Apparatus for Decoding/Encoding a Video Signal - A method of decoding a current layer using inter-layer prediction is disclosed. The present invention includes determining whether a position of a current block is included in a sampled reference layer, the current block included in the current layer, obtaining a plurality of prediction flags when the position of the current block is included in the sampled reference layer, and decoding the current layer using the plurality of the prediction flags. | 2009-12-17 |
20090310681 | SYSTEM FOR ANALYSIS OF MOTION - A computer system for real-time determination of a motion vector comprising an image processor to apply an image processing filter to a normalized frame element of a first image frame, yielding a filtered frame element having associated filtered pixel values, a pixel selector to select a first reference pixel from the filtered frame element having the highest value of the filtered pixel values, an optic flow module to determine a first optic flow applied at a location of the first reference pixel, a pattern matching module to perform pattern matching between the normalized pixel values of the normalized frame element and normalized frame elements of a second image frame, yielding a plurality of pattern matching scores, and a motion vector determiner to determine a motion vector based on a lowest one of the pattern matching scores. Related apparatus and methods are also described. | 2009-12-17 |
20090310682 | DYNAMIC IMAGE ENCODING METHOD AND DEVICE AND PROGRAM USING THE SAME - It is possible to provide a dynamic image encoding technique capable of performing high image quality encoding while eliminating formation of a vector field subjectively not desired. A dynamic image encoding device includes: inter-frame prediction means for inter-frame predicting an image in a block unit; motion vector calculation means for calculating a reference frame and a motion vector used for the inter-frame prediction of the block; prediction motion vector calculation means for calculating a prediction motion vector for prediction-encoding the motion vector of the block; skip mode motion vector calculation means for calculating a skip mode motion vector of a skip mode by using a context of a block spatially adjacent to the block; and skip mode validity judging means for judging whether the skip mode is valid as the encoding mode of the block. The skip mode validity judging means calculates a code amount of a differential motion vector of the motion vector estimated by considering the motion vector of the skip mode and the subjective image quality and uses a value of the code amount of the differential motion vector weighted by a block quantization parameter for the skip mode validity judgment. | 2009-12-17 |
20090310683 | Video coding device and video coding method - A video coding device includes an image-dividing number setting unit and a coding unit in the aims of suppressing an occurrence of a load cache miss when decoding a coded data without increasing a capacity of a cache memory even when a resolution of a video is high. The image-dividing number setting unit sets a dividing number of image. The coding unit divides a coding object image constituting the video into partial images with the same number as the dividing number of image, and performs a coding processing using a motion compensation on each of the partial images. | 2009-12-17 |
20090310684 | INFORMATION PROCESSING APPARATUS AND RECOVERY PROCESSING METHOD - According to one embodiment, an information processing apparatus includes a recovery module which causes a decording module to decode supplementary slice data when it is determined that the value of the information indicating a position of processing target slice data in the image is inappropriate. The recovery module creates the supplementary slice data by editing slice data located upwardly adjacent to the processing target slice in such a manner that information indicating a position thereof in the image is edited into information for the processing target slice. | 2009-12-17 |
20090310685 | HIGH-YIELD MULTI-THREADING METHOD AND APPARATUS FOR VIDEO ENCODERS/TRANSCODERS/DECODERS WITH DYNAMIC VIDEO REORDERING AND MULTI-LEVEL VIDEO CODING DEPENDENCY MANAGEMENT - Disclosed is an exemplary video coder and video coding method according to an embodiment of the present invention. The exemplary video coder includes a scheduler, a plurality of processors and a multiplexer. The scheduler can examine processing units in an input buffer to determine an order for the processing unit to be coded by a processor. If the processing unit under examination depends on a processing unit not yet processed, the processing unit under examination can be merged with other processing units, if any, that share a similar dependency. If the processing unit under examination does not depend on any processing units not yet processed, it can be sent to a next available processor for coding. When a processing unit is sent to a processor, any merged processing units that depend on sent processing unit can also be sent to a next available processor. | 2009-12-17 |
20090310686 | DISTRIBUTED DECODING DEVICE OF SEQUENTIAL PARALLEL PROCESSING SCHEME AND METHOD FOR THE SAME - The present invention relates to distributed decoding of sequential parallel processing scheme. More particularly, the present invention relates to distributed decoding of sequential parallel processing scheme, in which a plurality of slices of video stream are separated into headers and bodies, followed by sequentially parsing the headers and parallel decoding the bodies. According to the present invention, there is an advantageous effect in that time for decoding slice bodies is reduced and reproduction of high resolution video is smoothly processed. | 2009-12-17 |
20090310687 | METHOD AND APPARATUS FOR SPACE-TIME-FREQUENCY ENCODING AND DECODING - The present invention provides a space-time-frequency encoding and decoding method and apparatus used in a wireless communication system. With the encoding method provided in the invention, transmission code words and their redundant elements are properly allocated on space-time-frequency units, so that the transmission codes and their partial redundancies can be transmitted via different antennas. Accordingly, at the receiving side, the redundant elements and the corresponding code word elements can be combined, so as to enhance the SNR and diversity gains for a part of the elements in the code words, and hence enhance the reception quality for the overall data stream. | 2009-12-17 |
20090310688 | SYNCHRONIZATION POINT DETECTION METHOD AND POWER LINE COMMUNICATION APPARATUS - A method for detecting a synchronization point of an alternating power in comparing the alternating waveform with a threshold voltage is provided. The method includes the steps of detecting a rising point at which the voltage of the alternating waveform changes from a level lower than the threshold voltage to a level equal to or higher than the threshold voltage; detecting a falling point at which the voltage of the alternating waveform changes from a level equal to or higher than the threshold voltage to a level lower than the threshold voltage; measuring a first interval from the rising point to the falling point subsequent to the rising point; measuring a second interval from the falling point to the rising point subsequent to the falling point; and determining the synchronization point based on a difference between the length of the first interval and the length of the second interval. | 2009-12-17 |
20090310689 | METHOD FOR MODULATING A CARRIER SIGNAL AND METHOD FOR DEMODULATING A MODULATED CARRIER SIGNAL - A method for modulating a carrier signal used for transmitting analog or digital message signals is provided. The module k of elliptic functions is used as a modulation parameter instead of the amplitude or the frequency. The carrier signal modulated according to this modulation method is provided with a constant amplitude and a fixed frequency while the signal form is chronologically modified at the rhythm of the message that is to be transmitted. | 2009-12-17 |
20090310690 | METHODS AND SYSTEMS OF AGC AND DC CALIBRATION FOR OFDM/OFDMA SYSTEMS - Methods and apparatus for automatic gain control (AGC) and DC calibration for orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) systems are provided in an effort to avoid saturation of the analog-to-digital converter (ADC) in a radio frequency (RF) front end of a receiver, to handle dynamic received signal power, or to avoid interruptions in a communication link for DC calibration. For certain embodiments, the quantization error in the RF front end may also be decreased. | 2009-12-17 |
20090310691 | METHODS AND SYSTEMS FOR CARRIER FREQUENCY OFFSET ESTIMATION AND CORRECTION OFDM/OFDMA SYSTEMS - Methods and apparatus for determining an accurate fractional carrier frequency offset (CFO) adjustment in an orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) system in an effort to properly compensate for the actual CFO between a transmitter and a receiver are provided. This enhanced fractional CFO adjustment may be based on a history of estimated fractional CFOs and estimated carrier-to-interference-plus-noise ratios (CINRs) and may be statistically derived from this history, therefore leading to a more accurate fractional CFO adjustment when compared to conventional fractional CFO estimations. A more accurate fractional CFO adjustment may lead to increased physical layer performance and decreased decoding errors (i.e., lower bit error ratio, or BER). | 2009-12-17 |
20090310692 | CHANNEL ACCESS PROTOCOL FOR WIRELESS COMMUNICATION - Method, apparatus, and computer program product embodiments are disclosed to enable an access point in a wireless network to use Orthogonal Frequency-Division Multiple Access (OFDMA) reserve subcarriers of OFDM symbols for transmitting high priority voice data and video data to particular wireless devices, while the access point allocates the remaining available subcarriers for contention-based access by other wireless devices. | 2009-12-17 |
20090310693 | EFFICIENT CQI SIGNALING IN MULTI-BEAM MIMO SYSTEMS - The present invention relates to the signaling of channel quality information in a multi-beam transmission system, wherein a plurality of beams are simultaneously transmitted and a plurality of sets of channel quality information are transmitted for controlling independently the transmission rate on the different beams. Determined are beams with a different quality resulting in different effects of errors in the transmissions of the channel quality information for the beams. Said different effects are exploited for reducing a signaling overhead of the channel quality information for the beams. | 2009-12-17 |
20090310694 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING MAP INFORMATION IN A BROADBAND WIRELESS COMMUNICATION SYSTEM - A broadband wireless communication system and method are provided. The method includes allocating an orthogonal sequence to a MAP that requires ACKnowledge (ACK) transmission, transmitting the MAP that does not comprise allocation information of the orthogonal sequence, determining whether the orthogonal sequence is detected in an ACK channel allocated for a subframe that carries the MAP, and determining that the MAP is successfully received when the orthogonal sequence is detected. | 2009-12-17 |
20090310695 | COMMUNICATION APPARATUS, COMMUNICATION METHOD AND COMPUTER PROGRAM - There is provided a communication apparatus, including a transmission pattern generation unit that generates a transmission pattern according to a modulation method, a metric calculation unit that calculates an inter-signal distance between a received signal vector of received signals and an estimation vector, which is a product of channel information and the transmission pattern, a maximum likelihood pattern determination unit that determines a maximum likelihood signal pattern from the inter-signal distance calculated by the metric calculation unit, and an error estimation unit that estimates a phase error component and an amplitude error component contained in the received signal vector, wherein the metric calculation unit calculates the inter-signal distance between the received signal vector and the estimation vector by reflecting the phase error component and/or the amplitude error component estimated by the error estimation unit. | 2009-12-17 |
20090310696 | METHOD AND APPARATUS FOR MAPPING SIGNALS TO SUBCARRIERS IN MIMO WIRELESS NETWORK - The present invention aims to provide a method for mapping signals to subcarriers in a sending means of a MIMO-based wireless telecommunication network and an apparatus for the same. It is characterized in that, controlling the mapping of the signals in an input signal sequence to the subcarriers, so that the signals sent by different antennas at the same time correspond to nonadjacent signals in the input signal sequence. With the aid of the present invention, burst error due to deep fading channel can be effectively avoided, and diversity gains can be also improved. | 2009-12-17 |
20090310697 | MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) TRANSMITTER AND COMMUNICATION SYSTEM - A Multiple-Input Multiple-Output (MIMO) transmitter | 2009-12-17 |
20090310698 | WIRELESS COMMUNICATION SYSTEMS - A method of requesting a plurality of different characteristic indicators from a second communication apparatus (MS) in a wireless communication network comprising a first communication apparatus (BS) and a plurality of such second communication apparatuses (MS) which communicate with the first communication apparatus using a shared communication frame, the method comprising; the first communication apparatus (BS) transmitting ( | 2009-12-17 |
20090310699 | COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT - A communication apparatus for transmitting transmission data containing a preamble and a postamble is provided. The communication apparatus includes: a phase vector assigning unit which assigns a first phase vector to a plurality of subcarriers relating to the preamble and assigns a second phase vector to a plurality of subcarriers relating to the postamble, the first phase vector being different from the second phase vector. | 2009-12-17 |
20090310700 | Exploiting multiuser diversity through phase modulation multiplexing - A method and apparatus for combining signals of multiple users onto a common channel is disclosed. In one embodiment, the method comprises identifying one or more traffic channels that are of one or more predetermined quality levels to a plurality of subscriber units based on channel profiles of the plurality of subscriber units and transmitting phase modulation multiplexed signals to the plurality of subscriber units through a common set of one or more channels having higher quality than the one or more predetermined quality levels. | 2009-12-17 |
20090310701 | METHOD FOR TRANSMITTING/ RECEIVING SIGNAL IN MIMO SYSTEM - Disclosed is a method for transmitting a signal in a mobile communications system using a plurality of transmit/receive antennas. A method for transmitting a signal in accordance with an embodiment of the present invention comprises the steps of: a receiving end's calculating a signal to interference noise ratio (SINR) with respect to every antenna pairs configuring STTD pairs to be transmittable from a transmitting end; feedbacking information indicating an antenna pair having the greatest SINR to the transmitting end; and the transmitting end's performing a D-STTD transmission through the antenna pair determined by the feedbacked information. A method for transmitting a signal in accordance with another embodiment of the present invention comprises the steps of: a receiving end's feedbacking information of an antenna pair and/or an eigenvector (weight vector) of a channel matrix with respect to transmit antennas included in the space-time multiplexing (STTD) pair to a transmitting end; and the transmitting end's forming beam by multiplying a symbol with respect to each STTD pair by the eigenvector, and thereafter transmitting the beam through each transmit antenna (in case of using two antennas) or a transmit antenna pair (in case of using more than four antennas) determined by the information of the antenna pair. | 2009-12-17 |
20090310702 | OPERATION FOR BACKWARD-COMPATIBLE TRANSMISSION - The disclosure relates to a transmitter in a transmission system operable to optimize estimates of a quantity at a receiver for improved operation. The transmission system includes a transmitting means connected to a number of antennas (Txm), and to control means. The control means controls the transmitting means to initially transmit an initial training/quantity estimation sequence during an initial training/quantity estimation phase and subsequently transmit a sequence of data symbols such that the information rate of the data symbols is progressively increased. | 2009-12-17 |
20090310703 | SEQUENCE GENERATING METHOD FOR EFFICIENT DETECTION AND METHOD FOR TRANSMITTING AND RECEIVING SIGNALS USING THE SAME - A sequence generation method for allowing a reception end to effectively detect a sequence used for a specific channel of an OFDM communication system, and a signal transmission/reception method using the same are disclosed. During the sequence generation, an index is selected from among the index set having the conjugate symmetry property between indexes, and a specific part corresponding to the frequency “0” is omitted from a transmitted signal. In addition, a reception end can calculate a cross-correlation value between a received (Rx) signal and each sequence using only one cross-correlation calculation based on the conjugate symmetry property. | 2009-12-17 |
20090310704 | Low Complexity Systems and Methods for Peak-to-Average Ratio (PAR) Reduction Using Reserved Tones - Systems and methods for reducing the peak-to-average ratio (PAR) at the transmitter can reduce the dynamic range required in various analog components. PAR can be reduced by applying a time-domain compensation signal which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique. | 2009-12-17 |
20090310705 | OFDM-MODULATED-WAVE OUTPUT UNIT AND DISTORTION COMPENSATING METHOD - OFDM (orthogonal frequency division multiplex)-modulated wave output unit. An amplitude extraction section ( | 2009-12-17 |
20090310706 | Transmitter and Receiver Using Pseudo-Orthogonal Code - A transmitter using pseudo-orthogonal code includes a serial-to-parallel converter for converting serial transmission data into 9-bit parallel data, and a pseudo-orthogonal code memory for receiving the parallel data from the serial-to-parallel converter and outputting 16-bit pseudo-orthogonal code by using the received data as addresses. The pseudo-orthogonal code memory has the relationship of the input address and output code, as expressed in the following equation: | 2009-12-17 |
20090310707 | TRANSMITTER AND METHOD FOR TRANSMITTING SOFT PILOT SYMBOLS IN A DIGITAL COMMUNICATION SYSTEM - A transmitter, channel coder, and method for coding and transmitting a sequence of symbols in a digital communication system utilizing soft pilot symbols. In one embodiment, the transmitter transmits a set of soft pilot symbols with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as BPSK or QPSK while modulating the remaining symbols with a higher order modulation such as 16 QAM or 64 QAM. The transmitter shares the modulation type and location (time/frequency/code) of the soft pilot symbols with a receiver. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly helpful in establishing the amplitude reference essential in demodulating the higher order modulation symbols. In another embodiment, soft pilot symbols are inserted by low-level puncturing of channel encoded bits and replacing the punctured bits with known bit patterns. | 2009-12-17 |
20090310708 | Transmitter and Method for Transmitting Soft Pilot Symbols in a Digital Communication System - A transmitter, channel coder, and method for coding and transmitting a sequence of symbols in a digital communication system utilizing soft pilot symbols. In one embodiment, the transmitter transmits a set of soft pilot symbols with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as BPSK or QPSK while modulating the remaining symbols with a higher order modulation such as 16 QAM or 64 QAM. The transmitter shares the modulation type and location (time/frequency/code) of the soft pilot symbols with a receiver. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly helpful in establishing the amplitude reference essential in demodulating the higher order modulation symbols. In another embodiment, soft pilot symbols are inserted by low-level puncturing of channel encoded bits and replacing the punctured bits with known bit patterns. | 2009-12-17 |
20090310709 | Amplitude modulated pulse transmitter - An amplitude modulated pulse transmitter designed to operate across a multi MHz range of modulation frequencies. A wire wound rare earth magnet is to be utilized instead of the typical modulation transformer. Additionally, a plurality of electrolytic capacitors are also employed in the transmitter. | 2009-12-17 |
20090310710 | Crest factor reduction with phase optimization - A system for reducing peaks comprises a processor and a memory. The processor is configured to determine a phase offset for each of a plurality of input signals. The phase offset for each of the plurality of input signals are determined using one or more trials of phase offsets to determine a selected set of phase offsets. The processor is further configured to modulate the plurality of input data signals using the selected set of phase offsets to produce a plurality of modulated phase offset data signals and to generate a sum of the plurality of modulated phase offset data signals, wherein the sum has a lower peak value during a trial of the one or more trials of phase offsets as compared to the sum during another trial not using the selected set of phase offset signals. The memory is coupled to the processor and configured to provide the processor with instructions. | 2009-12-17 |
20090310711 | Transmitter and receiver capable of reducing in-phase/quadrature-phase (I/Q) mismatch and an adjusting method thereof - An adjusting method for reducing in-phase/quadrature-phase (I/Q) mismatch in a transmitter includes the steps of: a) receiving a first in-phase signal and a first quadrature-phase signal; b) adjusting a set of parameters such that an extent of I/Q mismatch related to the first in-phase signal and the first quadrature-phase signal is reduced; c) receiving a second in-phase signal and a second quadrature-phase signal, the second in-phase signal differing from the first in-phase signal in one of frequency and phase; d) adjusting the set of parameters such that an extent of I/Q mismatch related to the second in-phase signal and the second quadrature-phase signal is reduced; and e) determining final values for the set of parameters based on adjustment results of steps b) and d) such that extents of I/Q mismatch related to different frequencies are reduced. | 2009-12-17 |
20090310712 | WIRELESS RECEIVER - Provided is a wireless receiver capable of realizing multi-band and multi-mode operations while reducing an electric power consumption of an RF analog local oscillator. | 2009-12-17 |
20090310713 | RECEIVING APPARATUS, RECEIVING METHOD, AND PROGRAM - The present invention provides a receiving apparatus including: a capturing section configured to correct an error of a receive signal and capture the receive signal; a filtering section configured to remove a low frequency component of a signal indicative of an integrated value of an error of the receive signal; and a capture detecting section configured to monitor a signal outputted from the filtering section and, if the signal is within a predetermined range for a predetermined time, detect that the capturing section has captured the receive signal. | 2009-12-17 |
20090310714 | METHOD AND APPARATUS FOR CHANNEL ESTIMATION - The invention relates to DVB-T system, and in particular, to a channel estimation method for OFDM symbols. A plurality of symbols are received to generate a pilot response. A finite impulse response is generated from the pilot response. A coefficient table is selected based on the characteristics of the finite impulse response. The channel is estimated by interpolating the pilot response based on the coefficient table. | 2009-12-17 |
20090310715 | RECEIVER AND METHOD FOR PROCESSING RADIO SIGNALS USING SOFT PILOT SYMBOLS - A receiver and method for receiving and processing a sequence of transmitted symbols in a digital communication system utilizing soft pilot symbols. A set of soft pilot symbols are transmitted with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as BPSK or QPSK while modulating the remaining symbols with a higher order modulation such as 16QAM or 64QAM. The receiver knows the modulation type and location (time/frequency/code) of the soft pilot symbols, and demodulates them first. The receiver uses the demodulated soft pilot symbols as known symbols to estimate parameters of the received radio signal. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly helpful in establishing the amplitude reference essential in demodulating the higher order modulation symbols. | 2009-12-17 |
20090310716 | CHANNEL BIT DETECTION SYSTEM - A channel bit detection system is provided. The channel bit detection system includes an RF front end, an analog-to-digital converter, a combiner, a length estimator, a length accumulator, an offset control, and a channel bit detector. The RF front end receives an RF signal, and is then digitized at a sampling rate R into a plurality of samples by the analog-to-digital converter. The combiner produces combined samples by shifting the plurality of samples an offset value. The length estimator estimates a length of each two consecutive combined samples. The length accumulator produces land lengths and pit lengths of the combined samples according to length of each two consecutive combined samples. The offset control provides the offset value according to the land lengths and the pits lengths. The channel bit detector recovers the channel bit from the plurality of combined samples. | 2009-12-17 |
20090310717 | SIGNAL CONVERTERS - A signal converter. The signal converter converts an analog inphase signal and an analog quasdrature phase signal into a digital baseband inphase signal and a digital baseband quadrature phase signal. The analog inphase signal and the analog quadrature phase signal are orthogonal to each other and are carried in a predetermined intermediate frequency. The digital baseband inphase signal and the digital baseband quadrature phase signal are carried in zero frequency. The signal converter comprises a signal combiner combining the analog inphase signal and the analog quadrature phase signal to obtain an analog combined signal, an analog to digital converter converting the analog combined signal to a digital combined signal, and a signal separator separating the digital combined signal to obtain the digital baseband inphase signal and the digital baseband quadrature phase signal. | 2009-12-17 |
20090310718 | Data distribution system and reception apparatus - In a data distributing party, original data is divided into sub-blocks. Each sub-block is encoded according to a predetermined encoding/decoding formula, to divide each sub-block into sub-symbols. In the predetermined encoding/decoding formula, data prior to encoding can be restored by obtaining a predetermined number of data from data posterior to encoding. Each symbol is generated by retrieving sub-symbols from respective sub-blocks and each generated symbol is distributed. In contrast, in a data receiving party, when completing the reception of the symbols not less than a predetermined number necessary for restoring, the sub-symbols are extracted from the respective received symbols in an order of receiving the symbols to restore the sub-blocks posterior to encoding. Each restored sub-block posterior to encoding is decoded according to the above encoding/decoding formula to restore each corresponding sub-block prior to encoding. The restored sub-blocks are then joined to one another to restore the original data. | 2009-12-17 |