12th week of 2009 patent applcation highlights part 32 |
Patent application number | Title | Published |
20090074010 | METHOD AND APPARATUS FOR GENERATING DATA FRAME - Provided is a method and apparatus for generating a data frame. The method includes: generating a plurality of subframes by using at least one medium access control (MAC) service data unit (MSDU); generating at least one field of an unequal error protection (UEP) field indicating whether UEP is applied to the subframes, a modulation and coding scheme (MCS) field indicating a modulation and coding scheme applied to each of the subframes, and a length field indicating the length of each of the subframes; and generating a data frame by using the subframes and the at least one of the UEP field, the MCS field, and the length field. | 2009-03-19 |
20090074011 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, CONTROL METHOD AND STORAGE MEDIUM - The present invention provides a communication system that can suppress the crosstalk of a communication device installed in a remote terminal. The communication system according to the invention is the communication system configured so that a first communication device ( | 2009-03-19 |
20090074012 | BUFFERING A MEDIA STREAM - An apparatus and method of buffering a media stream is provided. The method may comprise receiving a plurality of IP packets of the media stream, each packet providing a fragment of a portion of the media stream. Thereafter, the portion of media stream may be buffered in a jitter buffer using the fragments provided by the received packets. Further, the portion of the media stream may be buffered in a replay buffer using the fragments provided by the received packets. The replay buffer may be larger than the jitter buffer and a first received fragment and a second received fragment may be combined. The second received fragment may have been discarded by the jitter buffer. A media stream may then be played back using media from the replay and/or jitter buffer. | 2009-03-19 |
20090074013 | Thulium doped fiber configuration for enhanced high power operation - An optical fiber amplifier includes a laser pump source for generating laser pump light; a fiber including an inner cladding layer optically coupled to a laser pump source for receiving laser pump light; a large mode area (LMA) core surrounded by the inner cladding, the LMA core including a confined region having a predetermined doping concentration of rare-earth ions for undergoing excitation to generate laser light when pumped by the laser pump light; and an outer cladding layer surrounding the inner cladding layer for substantially confining the laser pump light to the inner cladding and the LMA core. In a method of forming the optical fiber amplifier, a ratio of an area of the confined region to an area of the LMA core, and the predetermined doping concentration of the rare earth ions are selected so as to achieve a quantum efficiency (QE) gain factor of approximately 2, but such that the heat dissipation per unit length can be controlled by adjusting the area of the confined region. | 2009-03-19 |
20090074014 | MODE SELECTION FOR SINGLE FREQUENCY FIBER LASER - A method for generating a laser projection by employing a laser gain medium for receiving an optical input projection from a laser pump. The method further includes a step of generating a laser of a resonant peak from a single mode selection filter. | 2009-03-19 |
20090074015 | LASER OUTPUT SWITCHING BY TRANSVERSE MODE MODULATION - A pulsed laser for machining, has a mode switch, e.g. Q-switch device ( | 2009-03-19 |
20090074016 | Apparatus for Terahertz wave generation from water vapor - Apparatus for Terahertz wave generation. An amplified laser generates a pulsed optical fundamental beam and a crystal passes the fundamental beam to generate a second harmonic beam of the fundamental beam. A lens focuses the mixed fundamental and second harmonic beams and a gas cell containing water vapor receives the focused beams and generates Terahertz waves. | 2009-03-19 |
20090074017 | LIGHT OUTPUTTING DEVICE AND LIGHT SCANNING UNIT HAVING THE SAME - A light outputting device includes, a substrate, a vertical cavity surface emitting laser (VCSEL) provided on a surface of the substrate, including a light emitting surface which emits a light, and a monitoring detector provided on the light emitting surface of the VCSEL to receive a part of the light emitted from the VCSEL so as to monitor the amount of the light emitted from the VCSEL. | 2009-03-19 |
20090074018 | LASER DRIVING DEVICE - A laser driving device is provided that can support a higher speed and drives a semiconductor laser ( | 2009-03-19 |
20090074019 | OPTICAL INJECTION LOCKING OF VCSELS FOR WAVELENGTH DIVISION MULTIPLEXED PASSIVE OPTICAL NETWORKS (WDM-PONS) - Low cost implementation of broadband upstream transmission for local and access network applications is made possible through the use of modulated downstream signals in a wavelength division multiplexed (WDM) passive optical network (PON) to injection-lock vertical-cavity surface-emitting lasers (VCSELs) for operation as stable, uncooled, and directly-modulated upstream transmitters. By way of example and not limitation, an optical network unit comprises: downstream input, photoreceiver, tunable laser, upstream output, and means for directionally coupling the downstream input into the tunable laser for modulating the output wavelength which is coupled to the upstream output. | 2009-03-19 |
20090074020 | DBR laser with improved thermal tuning effciency - A distributed Bragg reflector (DBR) includes a base substrate and a gain medium formed on the base substrate. A waveguide positioned above the base substrate in optical communication with the gain medium and defines a gap extending between the base substrate and the waveguide along a substantial portion of the length thereof. The waveguide may have a grating formed therein. A heating element is in thermal contact with the waveguide and electrically coupled to a controller configured to adjust optical properties of the waveguide by controlling power supplied to the heating element. | 2009-03-19 |
20090074021 | OPERATING A PULSE LASER DIODE - Circuit arrangements for the operation of a pulse laser diode and methods for operating a pulse laser diode include a current source to supply a direct current to the pulse laser diode. The circuit arrangement can provide operation of the pulse laser diode that can be stable and without unintentional shifts in wavelength. | 2009-03-19 |
20090074022 | DUAL-WAVELENGTH SEMICONDUCTOR LASER DEVICE AND METHOD FOR FABRICATING THE SAME - In a dual-wavelength semiconductor laser in which a first semiconductor laser element and a second semiconductor laser element are integrated onto a substrate made of a compound semiconductor, a constituent material of an etching stopper of the first semiconductor laser element is a material which allows diffusion of impurities less easily than a constituent material of an etching stopper of the second semiconductor laser element. | 2009-03-19 |
20090074023 | Broad Spectrum Light Source - The light includes a laser ( | 2009-03-19 |
20090074024 | Photonic crystal laser - A laser capable of emitting multiple laser beams is provided. A two-dimensional photonic crystal laser according to the present invention has a laminated structure including an active layer, a first photonic crystal layer having a periodic distribution of refractive index with a first period, and a second photonic crystal layer having a periodic distribution of refractive index with a second period that differs from the first period. This two-dimensional photonic crystal laser can emit a main beam traveling in a direction perpendicular to the two-dimensional photonic crystals and side beams each traveling in a direction inclined with respect to the main beam. These beams can be used, for example, in a recording/reproducing device by means of an optical disk, the main beam being used for recording/reproducing information and the side beams for following up the track. | 2009-03-19 |
20090074025 | Vertical cavity surface-emitting semiconductor laser device, optical transmission module, optical transmission device, and optical switching method - In a vertical cavity surface-emitting semiconductor laser device, first and second resonance wavelengths which are different are provided while a first resonator and a second resonator are coupled optically, and a gain of an active layer at the first resonance wavelength on the side of short wavelength is higher than that at the second resonance wavelength on the side of long wavelength. An absorption coefficient of an optical absorption layer when no electric field is applied is small for the first and second resonance wavelengths, and when an electric field is applied, an absorption coefficient of the optical absorption layer for the first resonance wavelength on the side of short wavelength is larger than that for the second resonance wavelength on the side of long wavelength. | 2009-03-19 |
20090074026 | STRUCTURE HAVING PHOTONIC CRYSTAL AND SURFACE-EMITTING LASER - In a structure having a two-dimensional photonic crystal in which structures having different refractive indices are disposed at a two-dimensional period and comprising a structure emitting in a direction perpendicular to a resonance direction of light propagating in the in-plane direction of the two-dimensional photonic crystal, wherein the structure comprises a one-dimensional photonic crystal in which components having different refractive indices are arranged at a one-dimensional period, and, the light propagating in the in-plane direction of the two-dimensional photonic crystal is reflected by a photonic band edge of the one-dimensional photonic crystal. | 2009-03-19 |
20090074027 | HEAT FLUX SENSOR INCORPORATING LIGHT CONVEYANCE - A device that may utilize radiant energy emitted from a process to formulate heat flux information about the process. The light emitted from the process may be transmitted by a low loss light conveyance component to a heat flux sensing component situated remotely from the process. The process light energy may then be converted into heat energy by a high emissivity material coupled to the heat flux sensing component. The light conveyance component may further include an angular sensitivity corrector to increase the efficiency of light absorption. | 2009-03-19 |
20090074028 | Converter with a Container for Receiving Molten Metal and with a Measurement Device for the Optical Temperature Determination of the Molten Metal and Method for the Temperature Determination in such a Converter - The invention relates to a converter with a container for receiving molten metal and with a measurement device for the optical temperature determination of the molten metal. The converter has an optical waveguide for guiding electromagnetic radiation emitted by the metal to an optical detector for determining the temperature of the metal from an analysis of the electromagnetic radiation. The converter further has a line arranged between the optical detector and the container through which fluid flows for guiding and transporting the optical waveguide. The optical detector is arranged, spaced apart from the container, in a region in which the surrounding temperature is less than 150 DEG C. The invention further relates to a method for the temperature determination of the molten metal in such a converter. | 2009-03-19 |
20090074029 | ELECTRONIC THERMOMETER - An electronic thermometer includes a temperature sensing means for sensing a temperature of a part to be measured, and a prediction means for calculating an equilibrium temperature according to the temperature being sensed. The prediction means includes a parameter determination unit for calculating parameters of a prediction function having three parameters to obtain an equilibrium predicted temperature, and an equilibrium predicted temperature calculation means for calculating an equilibrium temperature during a period of the thermal equilibrium time, based on the parameters determined by the parameter determination unit. The parameter determination unit determines parameters held by the prediction function, based on three (or two) sensed temperatures and the measuring times thereof. According to the prediction function, the equilibrium temperature can be predicted with a small number of samplings, and the parameters are determined based on the sensed temperature and the measuring time of the sensed temperature. Consequently, the number of samplings to predict the equilibrium temperature is reduced, as well as solving a problem that the equilibrium temperature may be varied due to an external factor, individual difference, and the like. | 2009-03-19 |
20090074030 | Method of Characterizing Parameters and Removing Spectral Components of a Spread Spectrum Clock in a Communications Signal - Parameters of a spread spectrum clock signal in a communication signal are characterized by acquiring voltage samples of the communication signal at a nominal time location of an edge of the communication signal. The voltage samples are converted to time samples and the difference between the maximum and minimum time values is determined at the nominal time location. A spread spectrum clock magnitude number is generated by dividing the difference between the maximum and minimum time values by the nominal time location of the acquired voltage samples of the spread spectrum clock signal. A spread spectrum modulation profile of a spread spectrum clock signal is estimated by over sampling the time samples using an aliased index value to generate over sampled triangular waveforms representing the spread spectrum clock modulation profile. One of the over sampled triangular waveforms is use to generate the spread spectrum clock modulation profile. | 2009-03-19 |
20090074031 | SPREAD SPECTRUM RADAR APPARATUS - It is an object of the present invention to prevent the sensitivity of radar apparatus from falling. A spread spectrum radar apparatus which detects an object, includes a carrier wave oscillator which generates a carrier wave, transmission unit which transmits a spread signal which is the carrier wave spread using a first PN code, an intermediate demodulated signal generating unit which receives a reflected wave which is the spread signal reflected from the object, and despreads the reflected wave using a delayed second PN code that has a cyclically reversed logical value of the first PN code, to generate an intermediate demodulated signal, a low-pass filter through which a specific frequency component of the intermediate demodulated signal passes, and a sampling unit which samples an output signal from the low-pass filter, and the sampling unit samples the output signal in synchronization with the cycle of the reversal. | 2009-03-19 |
20090074032 | DISTRIBUTED SPECTRUM ALLOCATION SCHEME FOR COGNITIVE RADIO - A technique ( | 2009-03-19 |
20090074033 | COST EFFICIENT SPECTRAL-REUSE TRANSCEIVER - An operational mechanism enables frequency re-use techniques, including selective frequency hopping and channel aggregation, on very low-cost transceiver hardware. | 2009-03-19 |
20090074034 | DIRECT SEQUENCE SPREAD SPECTRUM TRANSCEIVER - A direct sequence spread spectrum (DSSS) transceiver including a DSSS transmitter and a DSSS receiver, wherein the DSSS transmitter includes: an integral code mapping unit mapping source bit data in one of 2 | 2009-03-19 |
20090074035 | Receiver for Receiving a Spectrum Dispersion Signal - A receiver for the CDMA system which reduces power consumption during a suspension period of intermittent receiving operation by monitoring a suspension period by a low-power timer so that a VC-TCXO, reference signal group generation and receiving units are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is started to count a time period and part of a received signal is stored. A PN code phase of stored data is calculated during the time period to obtain an indication value for phase deviation. State vectors for short and long codes and a further reception time are calculated based on the indication value. When the high-accuracy timer counts the time period and produces 0V(d), demodulation operation by a rake demodulation, demultiplexing, and descrambler units is started and is continued during the reception time. | 2009-03-19 |
20090074036 | SEGMENT-WISE CHANNEL EQUALIZATION BASED DATA ESTIMATION - Data is estimated of a plurality of received spread spectrum signals by a wireless communication apparatus. The plurality of received communications are received in a shared spectrum. The received communications are sampled to produce a received vector of sequential samples. The received vector is processed to produce a plurality of segments. Each segment is processed separately to estimate data of the received communications. | 2009-03-19 |
20090074037 | TRACKING APPARATUS AND METHOD IN MOBILE TERMINAL - A tracking apparatus and method in a mobile terminal are provided. The method includes extracting an on-time energy signal, an early energy signal, and a late energy signal from a received signal, estimating respective ICI components from the early energy signal and the late energy signal, measuring an early energy and a late energy by using the early energy signal and the late energy signal, and removing ICI by subtracting the estimated ICI components respective from the measured early energy and late energy. | 2009-03-19 |
20090074038 | Method for estimating hidden channel parameters of a received GNNS navigation signal - For the reduction of the multipath error of received GNSS navigation signals, a sequential Bayesian estimation is used, with a movement model underlying this estimation, which model is particularly designed for dynamic channel situations. Sequential Monte Carlo methods are used to calculate the posterior probability density functions of the signal parameters. To facilitate an efficient integration in received signal tracking loops, the invention builds on complexity reduction concepts that have previously been used in maximum likelihood (ML) estimators. | 2009-03-19 |
20090074039 | GMSK SPREAD MODULATION RECEIVER - A technique for receiving spread spectrum GMSK signals that demodulates Gaussian Minimum Shift Keying transmissions involving a sequence of data symbols, a spread spectrum code comprising a sequence of spread spectrum chips, a sequence of pre-modulation chips combining the sequence of data symbols with the spread spectrum chips, wherein for each data symbol, at least one of the pre-modulation chips is generated by taking into account at least the data symbol and at least one of the spread spectrum chips. | 2009-03-19 |
20090074040 | METHODS FOR MANAGING A MULTI DATA TYPE COMMUNICATION LINK - Methods for operating a multi data type communication link transceiver, including: testing the type of the link partner transceiver. If the link partner transceiver is not a multi data type communication link transceiver, operating the multi data type communication link according to the detected type of the link partner transceiver. If the link partner transceiver is a multi data type communication link transceiver, further including the steps of negotiating the functionality required from the multi data type communication link with the link partner, and switching to an appropriate mode of operation | 2009-03-19 |
20090074041 | ELECTRONIC SYNCHRONOUS/ASYNCHRONOUS TRANSCEIVER DEVICE FOR POWER LINE COMMUNICATION NETWORKS - An electronic synchronous/asynchronous transceiver device for power line communication networks is integrated into a single chip and operates from a single supply voltage. The transceiver device includes: at least an internal register that is programmable through a synchronous serial interface; at least a line driver for a two-way network communication over power lines implemented by a single ended power amplifier with direct accessible input and output lines that is part of a tunable active filter for the transmission path; and at least a couple of linear regulators for powering with different voltage levels different kind of external controllers linked to the transceiver device. | 2009-03-19 |
20090074042 | SCALING APPARATUS OF A RECEIVER - A scaling apparatus set in a receiver is disclosed. The receiver includes a symbol-processing unit. The scaling apparatus includes a calculating unit and a scaling unit. The calculating unit estimates the signal strength of an input symbol and generates a scaling factor accordingly. The scaling unit scales an output symbol outputted from the symbol-processing unit according to the scaling factor. The output symbol is generated from the symbol-processing unit through processing the input symbol. | 2009-03-19 |
20090074043 | RESOURCE ADAPTIVE SPECTRUM ESTIMATION OF STREAMING DATA - Streaming environments typically dictate incomplete or approximate algorithm execution, in order to cope with sudden surges in the data rate. Such limitations are even more accentuated in mobile environments (such as sensor networks) where computational and memory resources are typically limited. Introduced herein is a novel “resource adaptive” algorithm for spectrum and periodicity estimation on a continuous stream of data. The formulation is based on the derivation of a closed-form incremental computation of the spectrum, augmented by an intelligent load-shedding scheme that can adapt to available CPU resources. Experimentation indicates that the proposed technique can be a viable and resource efficient solution for real-time spectrum estimation. | 2009-03-19 |
20090074044 | COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION METHOD, INTEGRATED CIRCUIT AND CIRCUIT MODULE - A communication apparatus which transmits data to another communication apparatus through a transmission channel, includes: a display which displays a plurality of communication rates; and a controller which permits the display to display the communication rates. The controller acquires a first communication rate received from the another communication apparatus and based on a predetermined signal transmitted to the another communication apparatus through the transmission channel at a first time. The controller acquires a second communication rate received from the another communication apparatus and based on a predetermined signal transmitted to the another communication apparatus through the transmission channel at a second time. The controller calculates a plurality of communication rates on the basis of the first and second communication rate. The controller permits the display to display the plurality of the communication rate when a difference between the plurality of communication rates is larger than a predetermined value. | 2009-03-19 |
20090074045 | Estimating frequency offset at a subscriber station receiver - A method and system of estimating frequency offset at a subscriber station is disclosed. The method includes the subscriber station receiving a composite signal, in which the composite signal includes multi-carrier signals transmitted from a plurality of base stations. The subscriber station selects a subset of the plurality of base stations. The subscriber station selects at least one pair of multi-carrier symbols of the composite signal, wherein each of the at least one pair of multi-carrier symbols include a plurality of pilot sub-carriers. The subscriber station selects a subset of the plurality of pilot sub-carriers of the at least one pair of multi-carrier symbols based on transmit pilot symbols of the pilot sub-carriers of the multi-carrier signals transmitted by the subset of the plurality of base stations. The frequency offset is estimated based on a conjugate product between received symbols across at least one pair of multi-carrier symbols of each of the pilot sub-carriers of the selected subset of the plurality of pilot sub-carriers. | 2009-03-19 |
20090074046 | Data Structure Boundary Synchronization Between a Transmitter and Receiver - Synchronization between a transmitter and a receiver with respect to the boundary of higher-layer logical data structures is improved by considering both the statistical likelihood of the value of a transmitted boundary indicator and the quality of the channel during the transmission. A boundary indicator received under poor channel quality, that is decoded to a statistically unlikely value, is suspect and one or more retransmission is requested. A reliable value of the boundary indicator is a retransmitted boundary indicator received during good channel conditions; the value of two boundary indicators received successively, both under poor channel conditions, that decode to the same value; or a majority vote of three successive boundary indicators, the first two received under poor channel conditions. The accuracy of the received boundary indicator is increased, at a cost of one, or at most, two, retransmissions. | 2009-03-19 |
20090074047 | APPARATUS AND METHOD FOR ESTIMATING SIGNAL TO INTERFERENCE AND NOISE RATIO IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and method for estimating a Signal to Interference plus Noise Ratio (SINR) in a wireless communication system are provided. The method includes processing a received signal by Orthogonal Frequency Division Multiplexing (OFDM) demodulation to convert the received signal into frequency-domain data, selecting ranging data from the frequency-domain data, multiplying the selected ranging data by a ranging code to perform code demodulation, calculating at least one norm value and at least one coherent norm value by bundle for the code-demodulated data and estimating an SINR using the calculated at least one norm value and at least one coherent norm value. | 2009-03-19 |
20090074048 | EQUALIZER SYSTEM HAVING A TUNABLE ACTIVE INDUCTOR - An linear equalizer system for a transmission channel includes an active inductor with a tunable inductance and quality factor. The active inductor includes a transconducting element. A current steering digital to analog converter controls the flow of a bias current through the transconducting element to tune the active inductor. | 2009-03-19 |
20090074049 | USE OF EMPHASIS TO EQUALIZE HIGH SPEED SIGNAL QUALITY - A method, apparatus, and system for minimizing ringing in a high speed channel between a transmitter and a receiver in a circuit, including a component for initializing an n-tap equalization filter. The n-tap equalization filter includes numerous taps, each associated with each of numerous jitter pulses received from the transmitter at the receiver and over the channel. Many of the jitter pulses are greater than two. Further, each tap occurs at a time-domain point related to a time of a corresponding jitter pulse included within the numerous jitter pulses. Moreover, a component for applying the n-tap equalization filter to a subsequent signal sent over the channel is also included. | 2009-03-19 |
20090074050 | METHOD AND APPARATUS FOR RECEIVING CODED SIGNALS WITH THE AID OF CHANNEL STATE INFORMATION - Method and apparatus for receiving coded signals with the aid of CSI are provided. The method comprises: performing channel estimation to obtain a CFR estimation vector; computing a squared magnitude of the CFR estimation vector, and obtaining a normalization factor α by averaging the squared magnitudes of CFR estimations on all N subcarriers; finding a norm-shift operand m satisfying the condition that α | 2009-03-19 |
20090074051 | Method and apparatus for wireless transmission of high data rate streams - Methods, system and devices for wireless transmission of HDMI data streams. Plurality of data multiplex converters are constructed and used in parallel to process one HDMI datastream into plurality of channels of data packets wherein the plurality of channels of data packets are transmitted through Wi-Fi wireless protocols to a destination device. The received plurality of channels of data packets are reassembled into one data stream for display or play. | 2009-03-19 |
20090074052 | ENCODING DEVICE, ENCODING METHOD, ENCODING PROGRAM, DECODING DEVICE, DECODING METHOD, AND DECODING PROGRAM - The present invention relates to an encoding apparatus, an encoding method, an encoding program, a decoding apparatus, a decoding method and a decoding program for adaptively controlling an encoding bit rate. Coefficient data obtained using wavelet transform is quantized, and segmented into bit planes. The coefficient data is entropy encoded from the bit plane of the MSB in a direction from an upper bit position to a lower bit position. Entropy encoding is stopped at a bit position where an amount of code has reached a target amount. On the bit plane, the coefficient data is entropy encoded from a lower frequency region to a higher frequency region. Data greatly affecting subjective image quality of a decoded image is selectively output while the amount of code is easily controlled. | 2009-03-19 |
20090074053 | Personal Video Recorder - A sequence of picture slices is encoded as reference slices and non-reference slices, wherein the reference slices include B slices, by forming, for each B slice, at least one data packet containing data values derived from brightness and color information pertaining to the slice. The data packet for each B slice includes a header element indicating whether the B slice is a reference slice. The header element of each reference B slice has a value that depends on depth of the reference B slice in a hierarchy of discardability. | 2009-03-19 |
20090074054 | RESOLUTION-CONVERTING APPARATUS, RESOLUTION-CONVERTING METHOD AND PREVIEWING APPARATUS - A resolution-converting apparatus includes an input interface, a parameter calculator, a first converter, a decoder, and a second converter. The input interface inputs a video content compression-encoded and having first resolution, together with a second resolution which has been designated and which is lower than the first resolution. The parameter calculator calculates value n (natural number) when 1/2 | 2009-03-19 |
20090074055 | Extreme video compression over a Fixed Bandwidth Channel - Compression using a graded wavelet, general and camera motion compensation, and spatial and entropy coding to create a compressed video. | 2009-03-19 |
20090074056 | System for Preparing a Multimedia Stream - A system for preparing a first multimedia stream, for use with an environment comprising a repository for storing a plurality of tracks. Each track may be associated with at least one second multimedia stream. A track may comprise a single type of data (e.g., audio, video, etc.). The method may comprise receiving a request comprising an associated parameter (e.g., a position parameter) and determining at least two of the plurality of tracks associated with the parameter. The at least two tracks may have associated information that matches the position parameter. Responsive to determining the at least two tracks, the determined at least two tracks may be collated in order to generate the first multimedia stream. | 2009-03-19 |
20090074057 | VIDEO FRAME ENCODING AND DECODING - A video frame arithmetical context adaptive encoding and decoding scheme is presented which is based on the finding, that, for sake of a better definition of neighborhood between blocks of picture samples, i.e. the neighboring block which the syntax element to be coded or decoded relates to and the current block based on the attribute of which the assignment of a context model is conducted, and when the neighboring block lies beyond the borders or circumference of the current macroblock containing the current block, it is important to make the determination of the macroblock containing the neighboring block dependent upon as to whether the current macroblock pair region containing the current block is of a first or a second distribution type, i.e., frame or field coded. | 2009-03-19 |
20090074058 | CODING TOOL SELECTION IN VIDEO CODING BASED ON HUMAN VISUAL TOLERANCE - In one embodiment, a coding mode selection method is provided to improve the visual quality of an encoded video sequence. The coding mode is selected based on a human visual tolerance level. Picture data may be received for a video coding process. The picture data is then analyzed to determine human visual tolerance adjustment information. For example, parameters of a cost equation may be adjusted based on the human visual tolerance level, which may be a tolerance that is based on a distortion bound that the human visual system can tolerate. The picture data may be analyzed in places that are considered visually sensitive areas, such as trailing suspicious areas, stripping suspicious areas, picture boundary areas, and/or blocking suspicious areas. Depending on what kind of visually sensitive area is found in the picture data, a parameter in a cost equation may be adjusted based on different visual tolerance thresholds. The coding mode is then determined based on the cost. | 2009-03-19 |
20090074059 | ENCODING METHOD AND DEVICE FOR IMAGE DATA - An encoding method for encoding image data comprising a plurality of pixels is disclosed. Each pixel corresponds to a pixel value. First coefficients in different frequencies which are transformed and quantized from a first set of pixel values are provided. Second coefficients in different frequencies which are transformed and quantized from a second set of pixel values are provided. A bitstream by encoding the first coefficients with interleaving the second coefficients according to a predetermined order is generated. The predetermined order to encode the first coefficients with interleaving the second coefficients is from the first coefficients and the second coefficients in the lowest frequency to the first coefficients and the second coefficients in the highest frequency. | 2009-03-19 |
20090074060 | Method, medium, and apparatus for encoding and/or decoding video - A method, medium, and apparatus for encoding and/or decoding video by generating a scalable bitstream formed of a base layer bitstream and an enhancement layer bitstream so as to have forward compatibility, wherein the enhancement layer bitstream comprises a bit-depth field of the enhancement layer, a frame or a picture type field of the enhancement layer in consideration of a frame or a picture type of the base layer, an additional quantization information field for obtaining a quantization parameter of the enhancement layer together with a quantization parameter of the base layer, an intra-macroblock field of the enhancement layer, and an inter-macroblock field of the enhancement layer. | 2009-03-19 |
20090074061 | Method and Apparatus for Macroblock Adaptive Inter-Layer Intra Texture Prediction - There are provided scalable video encoders and decoders and corresponding methods for scalable video encoding and decoding. A scalable video encoder includes an encoder for selectively using spatial intra prediction to code, on a macroblock adaptive basis, an enhancement layer residue generated between an enhancement layer macroblock and a corresponding upsampled base layer macroblock. | 2009-03-19 |
20090074062 | Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list | 2009-03-19 |
20090074063 | Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list | 2009-03-19 |
20090074064 | Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list | 2009-03-19 |
20090074065 | Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list | 2009-03-19 |
20090074066 | Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list | 2009-03-19 |
20090074067 | Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 0 motion vector of the co-located block in a first reference picture as the motion vector if the co-located block has the list 0 motion vector and a list 1 motion vector. The first reference picture is a type of reference picture permitted to be located temporally before or after the current picture. The method further includes selecting the list 1 motion vector of the co-located block in the first reference picture if the co-located block only has the list 1 motion vector, and deriving at least one motion vector of the bi-predictive block based on the selected motion vector. The deriving includes deriving a first temporal distance from a difference between the current picture and the first reference picture, deriving a second temporal distance from a difference between the first reference picture and a second reference picture, and scaling the selected motion vector based on the first and second temporal distances. The second reference picture is pointed to by the selected motion vector. | 2009-03-19 |
20090074068 | Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 0 motion vector of the co-located block in a first reference picture as the motion vector if the co-located block has the list 0 motion vector and a list 1 motion vector. The first reference picture is a type of reference picture permitted to be located temporally before or after the current picture. The method further includes selecting the list 1 motion vector of the co-located block in the first reference picture if the co-located block only has the list 1 motion vector, and deriving at least one motion vector of the bi-predictive block by applying a bit operation to the selected motion vector. | 2009-03-19 |
20090074069 | Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list | 2009-03-19 |
20090074070 | Method and Apparatus for Slice Adaptive Motion Vector Coding for Spatial Scalable Video Encoding and Decoding - There are provided spatial scalable video encoder and decoders and corresponding methods for scalable video encoding and decoding. A method for spatial scalable video encoding includes selecting between scalable coding and non-scalable coding of motion vectors on a slice basis. | 2009-03-19 |
20090074071 | Apparatus and Method for Image Processing and Computer Program - An image processing apparatus includes the following elements. A local motion vector estimation unit estimates a local motion vector associated with each of blocks, serving as segments of an image frame constituting a moving image. A block weight calculation unit calculates a block weight as an index of the reliability of a local motion vector for each block. A global motion vector estimation unit receives the local motion vectors and the weights to estimate a global motion vector as a motion vector common to the blocks in the frame. The global motion vector estimation unit calculates, as a cost, the sum of the products of the differences between the local motion vectors associated with the respective blocks and the global motion vector and the block weights assigned to the respective blocks subjected to difference calculation and calculates parameters of the global motion vector which minimize the cost. | 2009-03-19 |
20090074072 | MOVING IMAGE CODING APPARATUS - A moving image coding apparatus includes a motion vector search unit configured to read coding target image data and reference image data which are stored in a memory, and search a motion vector. The motion vector search unit reads the coding target image data in multiple units of N horizontal pixels (N is an integer of 2 and more) and 1 vertical pixel and reads the reference image data in multiple units of P horizontal pixels (P is an integer of 2 and more) and Q vertical pixels (Q is an integer of 2 and more) from the memory. | 2009-03-19 |
20090074073 | CODING OF MOTION VECTOR INFORMATION - Techniques and tools for encoding and decoding motion vector information for video images are described. For example, a video encoder yields an extended motion vector code by jointly coding, for a set of pixels, a switch code, motion vector information, and a terminal symbol indicating whether subsequent data is encoded for the set of pixels. In another aspect, an encoder/decoder selects motion vector predictors for macroblocks. In another aspect, a video encoder/decoder uses hybrid motion vector prediction. In another aspect, a video encoder/decoder signals a motion vector mode for a predicted image. In another aspect, a video decoder decodes a set of pixels by receiving an extended motion vector code, which reflects joint encoding of motion information together with intra/inter-coding information and a terminal symbol. The decoder determines whether subsequent data exists for the set of pixels based on e.g., the terminal symbol. | 2009-03-19 |
20090074074 | MULTIPLE DESCRIPTION ENCODER AND DECODER FOR TRANSMITTING MULTIPLE DESCRIPTIONS - An apparatus and method for joint reconstruction of multiple data streams is provided. An MD encoder can include a plurality of sub-encoders for encoding an input signal into a plurality of unique descriptions based on linear transformations and quantization of the input signal. An MD decoder can decode a plurality of unique descriptions associated with at least one input signal by utilizing a plurality of sub-decoders. Each sub-decoder can decode the plurality of unique descriptions based on coding noise variance and a coding error correlation coefficient associated with the plurality of unique descriptions. The MD decoder can include a joint reconstruction component that reconstructs the at least one input signal based on, at least in part, extracting a unique coding characteristic associated with each description of the plurality of unique descriptions and estimating a weighting factor for each description of the plurality of unique descriptions. | 2009-03-19 |
20090074075 | EFFICIENT REAL-TIME RATE CONTROL FOR VIDEO COMPRESSION PROCESSES - In advanced video coding standards such as H.264, macro-blocks belong to more advanced MB types, such as skipped and non-skipped macro-blocks. In non-skipped macro-blocks, the encoder determines whether each of 8×8 luminance sub-blocks and 4×4 chrominance sub-block of a macro-block is to be encoded, giving the different number of sub-blocks at each macro-block encoding times. It has been found that the correlation of bits between consecutive frames is high. This correlation is even higher after macro-block normalization by considering advanced macro-block types. Based on this bit characteristic, a fast real-time H.264 rate control scheme is herein described. The empirical example results suggest that this scheme can achieve PSNR gain over JM10.2. | 2009-03-19 |
20090074076 | METHOD AND DEVICE FOR VECTOR QUANTIZATION - A method for quantizing vector. The method includes: performing a quantization process on a vector to be quantized by use of N basic codebook vectors and the adjustment vectors of each of the basic codebook vectors, generating a basic codebook vector and an adjustment vector used for quantizing the vectors to be quantized, N being a positive integer larger than or equal to 1. According to the present invention, based on the method a device for quantizing vector is disclosed. According to embodiments of the present invention, the quantization of an input vector is done by introducing the modification vectors for the base codebook vectors, therefore the memory amount of the base codebook vectors is reduced effectively, and the calculation amount is merely the calculation amount required for going through N codebooks. Therefore, the complexity of the vector quantization could be decreased effectively. | 2009-03-19 |
20090074077 | VIDEO SOURCE CODING WITH DECODER SIDE INFORMATION - A method and system ( | 2009-03-19 |
20090074078 | MOVING IMAGE REPRODUCTION DEVICE - When an abnormality detected by abnormality detection means is a predetermined abnormality, list correction means corrects a reference list used for enabling access to be made to a decoded frame stored in storage means and used as a reference image. In the case where an n-th frame is a frame decoded using another frame, frame decoding means decodes the n-th frame using a decoded frame which is a reference image stored in the storage means and is accessible by means of the reference list when the n-th frame is decoded, based on header information of the n-th frame. | 2009-03-19 |
20090074079 | DIGITAL BROADCASTING SYSTEM AND METHOD OF PROCESSING DATA IN DIGITAL BROADCASTING SYSTEM - A digital broadcasting system and a data processing method are disclosed. The data processing method includes receiving a broadcast signal in which main service data and mobile service data are multiplexed, demodulating the broadcast signal to acquire fast-information-channel signaling information including reference time information for a system clock, and outputting demodulation time information of a specific position of a frame of the broadcast signal, decoding the fast-information-channel signaling information, and establishing the reference time information as the system clock at a demodulation time according to on the outputted demodulation time information and decoding the mobile service data according to the system clock. | 2009-03-19 |
20090074080 | Estimating Complexity of Video Frames for Encoding - Complexity for a video frame after a special event is estimated and used for encoding the frame. The complexity for a key frame of a special event is estimated based on its intra activity and a complexity of a previously encoded key frame in the video stream prior to the special event. The complexity for a dependent frame after a special event is estimated based on a motion estimation cost for the dependent frame and a complexity of a previously encoded dependent frame prior to the special event. | 2009-03-19 |
20090074081 | METHOD FOR FORMATTING DIGITAL BROADCAST TRANSPORT STREAM PACKET FOR IMPROVED RECEIVING PERFORMANCE, DIGITAL BROADCAST TRANSMITTER, AND SIGNAL PROCESSING METHOD THEREOF - A method of formatting a digital broadcast transport stream packet, a digital broadcast transmitter, and a signal processing method thereof, includes constructing a transport stream packet that includes a stuffing region for an insertion of a known supplementary reference signal (SRS) data therein, randomizing the packet that includes the stuffing region is randomized, and the SRS data is inserted into the stuffing region of the randomized packet. Adding a parity for an error correction to the packet into which the SRS data has been inserted, the packet to which the parity has been added is interleaved, and a trellis encoding of the interleaved packet is performed. Inserting a segment sync signal and a field sync signal into the trellis-encoded packet, and a vestigial side band (VSB) modulation and an RF conversion of the packet are performed to transmit the VSB-modulated and RF-converted packet. | 2009-03-19 |
20090074082 | System And Method Of Error Control For Video Coding - A system and method for video coding include an encoder and decoder. The encoder/decoder respectively include a base layer encoding/decoding apparatus, at least one enhancement layer encoding/decoding apparatus, and an encoder/decoder drift control apparatus. The encoder drift control apparatus is configured to determine the amount of local error drift for the encoder according to local information of the base layer encoding apparatus and the enhancement layer encoding apparatus and control the value of an encoder leaky factor according to the amount of error drift. The decoder drift control apparatus is configured to determine the amount of local error drift for the decoder according to local information of the base layer decoding apparatus and the enhancement layer decoding apparatus and control a decoder leaky factor according to the amount of error drift. | 2009-03-19 |
20090074083 | METHOD OF PROCESSING VIDEO DATA AND WIRELESS COMMUNICATION APPARATUS - A method of processing video data includes allowing a counter to start counting, receiving the video data to which a timestamp is applied, checking the amount of video data in a buffer memory, comparing the timestamp with a count if the amount of video data in the buffer memory is smaller than a predetermined threshold, and discarding the video data if the timestamp is smaller than the count and accumulating the video data in the buffer memory if the timestamp is greater than the count. The counter uses a value corresponding to a time earlier than the timestamp by a delay time when the video data is initially received. | 2009-03-19 |
20090074084 | Method and System for Adaptive Preprocessing for Video Encoder - Certain aspects of a method and system for adaptive preprocessing for an encoder may comprise filtering received video data using one or more spatial and/or temporal filtering parameters. The spatial and/or temporal filtering parameters may be adaptively updated to achieve a targeted bitrate based on statistical analysis of received video data and encoder feedback. The statistical analysis of received video data may comprise analysis of statistical inputs such as an encoding standard of the received video data, an average quantization factor, an input noise level, an average picture luma level, a motion vectors histogram, and a content type detection of the received video data. The spatial filtering parameters may be adaptively updated during an I frame of the received video data and the temporal filtering parameters may be adaptively updated per frame of the received video data. | 2009-03-19 |
20090074085 | COMMUNICATION DEVICE, MULTI CARRIER TRANSMISSION SYSTEM, COMMUNICATION METHOD, AND RECORDING MEDIUM - The present invention provides a communication device that may suppress unnecessary break points. A communication device | 2009-03-19 |
20090074086 | MIMO-OFDM TRANSMISSION DEVICE AND MIMO-OFDM TRANSMISSION METHOD - A MIMO-OFDM transmission apparatus is provided which allows high accuracy estimation of frequency offset, high accuracy estimation of a transmission path fluctuation and high accuracy synchronization/signal detection. | 2009-03-19 |
20090074087 | SYSTEM FOR FOLLOW-UP SYNCHRONIZATION TO MAINTAIN SYNCHRONIZATION THROUGHOUT TRANSMISSION - A bidirectional communication system is provided. In one embodiment, a system comprises a host unit to communicate with a plurality of remote units using orthogonal frequency division multiplexing, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration; the host unit receiving an orthogonal frequency division multiplexing waveform, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by the plurality of remote units; and wherein the host unit is configured to transmit adjustment information to a first remote unit of the plurality of remote units to maintain the plurality of tones transmitted by the plurality of remote units substantially orthogonal as received at the host unit, the information directing the first remote unit to adjust tones transmitted by the first remote unit. | 2009-03-19 |
20090074088 | Adaptive Fragmentation for HARQ in Wireless OFDMA Networks - A method performs a hybrid automatic repeat-request (HARQ) operation in a wireless orthogonal frequency division multiple access (OFDMA) network. A quality of a channel between a transmitter and a receiver is estimated as an error metric. A packet for the HARQ operation is fragmented adaptively at the transmitter according to the estimated error metric. The fragmentation is performed at the HARQ layer when the error metric is less than a predetermined threshold, otherwise the fragmentation is performed at the MAC layer. | 2009-03-19 |
20090074089 | CQI REPORTING TECHNIQUES FOR OFDMA WIRELESS NETWORKS - Various embodiments of the invention may use bitmaps to communicate channel quality index (CQI) information for multiple sub-channels in an orthogonal frequency division multiple access (OFDMA) wireless communications network. A base station may use bitmaps to report on whether the CQI information for each sub-channel has been under-reported or over-reported. A mobile station may use bitmaps to consolidate CQI information for multiple sub-channels into a single CQI set of parameters. | 2009-03-19 |
20090074090 | SYSTEMS AND METHODS FOR RESTRICTING THE LOCATION OF CONTROL INFORMATION IN PHYSICAL LAYER SIGNALING - A method for conserving the power supply of an Orthogonal Frequency Division Multiplexing (OFDM) communications device is described. The location of control information within one or two of a plurality of symbols is obtained. A sleep mode is entered into. The one or two symbols that include the control information are monitored. A return to the sleep mode is executed. | 2009-03-19 |
20090074091 | INDIVIDUAL INTERLEAVING OF DATA STREAMS FOR MIMO TRANSMISSION - The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas is formed, and multiple second data streams are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed. During successive transmission intervals, the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols. | 2009-03-19 |
20090074092 | OFDM RECEPTION DEVICE AND OFDM RECEIVER USING THE SAME - An OFDM reception device includes: a first channel estimation unit for estimating a channel distortion by using a signal that is supplied from the reception unit and has a first time interval; a second channel estimation unit for estimating a channel distortion by using a signal that is supplied from the reception unit and has a second time interval shorter than the first time interval; a selection unit for selecting and outputting one of a signal from the first channel estimation unit and a signal from the second channel estimation unit, according to a control signal from the control unit; and a correction unit for correcting a reception signal supplied from the reception unit, according to the channel estimation signal from the selection unit. The control unit determines the control signal to be supplied to the selection unit, according a reception state of the reception unit. | 2009-03-19 |
20090074093 | APPARATUS FOR TRANSMITTING DATA USING CARRIERS AND METHOD THEREOF - An apparatus for transmitting data using a plurality of carriers and method thereof are disclosed, by which PAPR improving effect is enhanced. A method of generating an OFDM signal, which is transmitted by spreading data symbols using a DFT (Discrete Fourier Transform) matrix, according to the present invention includes the steps of generating an output symbol by data-processing the data symbols in time domain in a manner of giving a specific weight to the data symbols and summing up the weight-given data symbols and generating the OFDM signal by performing OFDM data processing on the output symbol. | 2009-03-19 |
20090074094 | BEACON SYMBOLS WITH MULTIPLE ACTIVE SUBCARRIERS FOR WIRELESS COMMUNICATION - Techniques for transmitting information using beacon symbols in a wireless communication system are described. In one design, a transmitter may map information to multiple subcarriers among a plurality of subcarriers, with the information being conveyed by the position of the multiple subcarriers. The transmitter may map the information to at least one non-binary symbol. The transmitter may then determine each of the multiple subcarriers based on one non-binary symbol or may determine all of the multiple subcarriers based on one non-binary symbol. The transmitter may generate a beacon symbol having the information mapped to the multiple subcarriers. The transmitter may use higher transmit power for the multiple subcarriers to allow receivers with low geometry to reliably receive the information. The use of multiple subcarriers may allow more information to be sent in the beacon symbol and may also improve frequency diversity. | 2009-03-19 |
20090074095 | SYSTEM FOR MULTI-FRAME ALIGNMENT - A bidirectional communication system is provided. In one embodiment, a system comprises a host and a plurality of remote units, wherein a plurality of tones is shared among the plurality of remote units in order to communicate with the host using orthogonal frequency division multiplexing, wherein the plurality of tones is shared in a manner that permits at least two of the remote units to transmit to the host at any one time using the plurality of tones. The host causes at least one remote unit to adjust a timing of symbols transmitted on at least one of the plurality of orthogonal tones in order to improve an alignment of multiframes received at the host. | 2009-03-19 |
20090074096 | APPARATUS FOR HIGH DATA THROUGHPUT RECEPTION IN A WLAN - An apparatus for high data throughput reception in a WLAN includes a receiving module, first and second determining modules, a generating module, and a producing module. The receiving module receives a symbol vector representing M streams of symbols transmitted via a wireless communication channel. The first determining module determines inner coded bits and extrinsic information of the inner coded bits based on the symbol vector, a channel matrix, and inner extrinsic information feedback. The second determining module determines outer coded bits and extrinsic information of the outer coded bits based on the extrinsic information of the inner coded bits, the inner coded bits, and a soft input soft output decoding process. The generating module generates the inner extrinsic information feedback based on the extrinsic information of the outer coded bits. The producing module produces decoded bits based on the outer coded bits. | 2009-03-19 |
20090074097 | SYMBOL DE-MAPPING METHODS IN MULTIPLE-INPUT MULTIPLE-OUTPUT SYSTEMS - In a multiple-input multiple-output (MIMO) system, multiple receive antennas produce a received signal vector, Y, which includes an element for each of the receive antennas. In an embodiment of a de-mapping method performed within a MIMO receiver, a quadrature phase shift keying (QPSK) search is performed within a search space that includes the full constellation of symbol points. Based on the results of the QPSK search, the search space is reduced to fewer than all of the quadrants, and the received signal vector data is scaled and transformed to the reduced search space. A lower-level QPSK search is performed, and the process is repeated until the modulation order is reduced to a QPSK constellation. Hard or soft decisions corresponding to the search results may then be passed to a decoder. | 2009-03-19 |
20090074098 | System and method for embedding OFDM in CDMA systems - Systems and methods of combining OFDM and CDMA signals are provided. An OFDM packet data channel is overlaid over CDMA transmissions. The channel is scheduled slotwise between multiple users. In some embodiments, there is a CDMA packet data channel which is scheduled together with the OFDM packet data channel. | 2009-03-19 |
20090074099 | CHANNEL AWARE MULTIPLE USER MIMO SCHEME UNIFIED WITH SINGLE USER CLOSED LOOP MIMO - A base station is capable of unifying a single-user MIMO scheme with a multi-user MIMO scheme by receiving a Rank-1 CQI values from one or more subscriber stations. The base station also receives preceding vectors from the subscriber stations, and then determines which of the subscriber stations has a best Rank-1 CQI value. The base station then determines a beam forming matrix to use based at least in part on the vectors received from the subscriber station having the best Rank-1 CQI value. The base station then broadcasts data to the subscriber station using the beam forming matrix corresponding to the subscriber station having the best Rank-1 channel quality indicator to implement single-user MIMO in one or multiple streams to that subscriber station, or to the subscriber stations having the best Rank-2 channel quality indicators to implement multi-user MIMO in multiple streams. | 2009-03-19 |
20090074100 | APPARATUS AND METHOD FOR DETECTING CYCLIC PREFIX LENGTH IN MOBILE COMMUNICATION SYSTEM - An apparatus and method for detecting a Cyclic Prefix (CP) length in a mobile communication system are provided. The apparatus includes first, second, third and fourth correlators, an average unit, and a length detector. The first, second, third and fourth correlators respectively correlate first, second, third and fourth CP parts within a frame boundary. The average unit averages the correlation values of the first, second, third and fourth correlators. The length detector determines the CP as an extended CP if the average value minus the correlation value of the fourth correlator is greater than a first threshold value. Accordingly, less memory may be required to determine a CP length as compared to the conventional art. | 2009-03-19 |
20090074101 | Detection Performance in Communication Systems - A method and system to generate decoded information from received symbols in communication receivers. A first embodiment is a method to detect digitally modulated symbols and generate decoded information. The method includes receiving digitally modulated symbols, demapping the digitally modulated symbols to generate soft decisions representing digitally modulated symbols, multiplying the soft decisions by an adaptive factor to generate scaled soft decisions; and decoding the scaled soft decisions to generate decoded information. A second embodiment is a system having modules to detect digitally modulated symbols and generate decoded information. These embodiments can be applied in several wired and wireless communication applications including, but not limited to, WiMAX applications. | 2009-03-19 |
20090074102 | Method and apparatus for wired signal transmission - A method and apparatus for high quality signal transmission, which utilizes normal-mode current flow and produces an audio output signal with suppression of normal-mode voltage amplitude, comprising transmitting an audio input signal source though (1) a buffer amplifier; (2) a modulated current source; (3) a pair of wires; (4) a current transformer; and (5) a receiver amplifier for said current transformer. | 2009-03-19 |
20090074103 | RATE MATCHING TO MAINTAIN CODE BLOCK RESOURCE ELEMENT BOUNDARIES - Embodiments of the present disclosure provide a transmitter, a receiver and methods of operating a transmitter and a receiver. In one embodiment, the transmitter is for use with multiple transmit antennas and includes an encoding unit configured to segment input bits into one or more code blocks. The transmitter also includes a rate matching unit configured to generate a stream of transmit bits from the one or more code blocks, wherein a group of transmit bits allocated to one resource element originates from only one of the one or more code blocks. The transmitter further includes a mapping unit configured to provide modulated symbols from the stream of transmit bits on a number of spatial transmission layers for one or more resource elements. The transmitter still further includes a transmit unit configured to transmit the modulated symbols employing the multiple transmit antennas. | 2009-03-19 |
20090074104 | SUBDIMENSIONAL SINGLE-CARRIER MODULATION - A method for modulating a sequence of data symbols such that the transmit signal exhibits spectral redundancy. Null symbols are inserted in the sequence of data symbols such that a specified pattern of K data symbols and N−K null symbols is formed in every period of N symbols in the modulated sequence, N and K being positive integers and K being smaller than N. | 2009-03-19 |
20090074105 | Correction of distortions in an emission chain - An emission chain is suitable for receiving an input signal and for providing a signal to be emitted. It comprises a processing pathway for the input signal which includes a digital signal decomposition according to N signal components, with N an integer greater than or equal to 2, said N signal components, on the one hand, being converted from a digital form into an analog form and, on the other hand, following respectively distinct physical pathways, said physical pathways inducing first respective delays on the N signal components. The input chain comprises a power amplifier. | 2009-03-19 |
20090074106 | MULTI-MODE AND MULTI-BAND TRANSMITTERS FOR WIRELESS COMMUNICATION - Transmitters supporting multiple modulation modes and/or multiple frequency bands are described. A transmitter may perform large signal polar modulation, small signal polar modulation, and/or quadrature modulation, which may support different modulation schemes and systems. Circuit blocks may be shared by the different modulation modes to reduce cost and power. For example, a single modulator and a single power amplifier may be used for small signal polar modulation and quadrature modulation. The transmitter may apply pre-distortion to improve performance, to allow a power amplifier to support multiple frequency bands, to allow the power amplifier to operate at higher output power levels, etc. Envelope and phase distortions due to non-linearity of the power amplifier may be characterized for different input levels and different bands and stored at the transmitter. Thereafter, envelope and phase signals may be pre-distorted based on the stored characterizations to compensate for non-linearity of the power amplifier. | 2009-03-19 |
20090074107 | METHOD AND APPARATUS FOR OPTIMIZING TRANSMITTER POWER EFFICIENCY - A peak to average power ratio signal is generated from a first mapping function that selects the peak to average power ratio signal that corresponds to the data rate or data format of the signal to be transmitted. The selected peak to average power ratio signal is summed with a desired average transmit power signal. The resulting summation signal is input to a second effectively continuously valued mapping function comprising a table that has a plurality of power amplifier control signal values each with a corresponding peak transmit power. Each peak transmit power signal value results in a power amplifier control signal value that achieves the best possible transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirements. The summation signal value maps to one of the power amplifier control signal value that is then used to adjust a parameter such as bias of the power amplifier. | 2009-03-19 |
20090074108 | METHOD AND SYSTEM FOR ADJUSTING THE AMPLITUDE AND PHASE CHARACTERISTICS OF REAL AND IMAGINARY SIGNAL COMPONENTS OF COMPLEX SIGNALS PROCESSED BY AN ANALOG RADIO TRANSMITTER - A method and system for determining amplitude and phase compensation values used to adjust the amplitude and phase characteristics of real and imaginary signal components of complex signals processed by an analog radio transmitter. The compensation values may be determined in response to detecting a significant temperature change in the transmitter. Corresponding amplitude and phase adjustment signals having levels that correspond to the compensation values are provided to respective amplitude and phase imbalance compensation modules to adjust the amplitude and phase characteristics of at least one of the real and imaginary signal components. | 2009-03-19 |
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. | 2009-03-19 |