Abstract: Provided is a apparatus for testing reliability of a semiconductor sample including: a sample mounting part for mounting the semiconductor sample on an upper center part thereof, and mounting components having an evaluation circuit board at an upper peripheral part thereof; a heating block formed to have a tip shape and mounted on a lower part of the semiconductor sample to maintain a test temperature; a cooling block separated from the heating block and surrounding the heating block to cool the temperature of the components; and a fixing block for raising and lowering the semiconductor sample.

Abstract: Methods for maximum scene surface temperature estimation for blades with reflective surface properties in advanced stationary gas turbines are disclosed. The approach utilizes high speed infrared imagery provided by an online monitor system using a focal plan array (FPA) for near-infrared monitoring during engine runtime up to base load. The one waveband method for temperature estimation is assumed as starting point. A lower surface emissivity and higher surface reflectance of thermal barrier coating (TBC) in near-infrared can cause systematic estimation errors. Methods using the one wave band method, with the purpose to reduce estimation errors for maximum temperatures are also disclosed. Theoretical results, data from numerical simulations, and real data from engine test are provided. A system for performing temperature estimation methods is also disclosed.

Abstract: Methods and systems for producing a digital temperature reading are provided. In an embodiment, one or more current sources and one or more switches are used to selectively provide a first amount of current (I1) and a second amount of current (I2) to the emitter of a transistor (Q1), during different time slots of a time period, to thereby produce a first base-emitter voltage (Vbe1) and a second base-emitter voltage (Vbe2), where I1=I2*M, and M is a known constant. An analog-to-digital converter (ADC) digitizes analog signals representative of the magnitudes Vbe1 and Vbe2. A difference is determined between the magnitudes of Vbe1 and Vbe2. A digital calculator produces a digital temperature reading (DTR) based on the difference between the magnitudes of Vbe1 and Vbe2.

Abstract: Systems and methods are described for multicarrier orthogonal spread-spectrum (MOSS) data communication. A method includes individually spread-spectrum modulating at least two of a set of orthogonal frequency division multiplexed carriers, wherein the resulting individually spread-spectrum modulated at least two of a set of orthogonal frequency division multiplexed carriers are substantially mutually orthogonal with respect to both frequency division multiplexing and spread-spectrum modulation.

Abstract: A receiving system allows for the coherent detection of a spread-spectrum transmission at any point in time during the transmission, thereby avoiding the need to identify the start of the transmission during the transmission-detection process. An input buffer captures the transmissions on a communication channel using a moving time-window. A detector processes a time-slice from the input buffer and identifies all of the simultaneously transmitting transmitters during that time-slice. As each transmitter is identified, the demodulator traces back-in-time to identify where the message can first be detected in the input buffer. The transmission includes suitable characteristics to facilitate detection and demodulation of the message content, but need not contain a preamble to allow the detection process.

Abstract: Data is estimated from a received vector comprising a plurality of communications. A received wireless signal is converted to a baseband signal, which is sampled to produce a received vector. Channel responses are estimated for the received communications. The noise variance is estimated. The noise variance is scaled by a scaling factor. Samples are processed using the estimated channel responses and the scaled noise variance to produce a spread data vector. The spread data vector is despread to recover the data of the received wireless signal.

Abstract: A correlation detection apparatus detects a correlation between a reception signal and a spreading code. A logic circuit is operated with a chip clock. The logic circuit generates the spreading code of an offset unit of ½ chip according to a combination value of chips next to each other in a spreading code sequence, the spreading code sequence taking values of “+1” and “?1.” The logic circuit includes a ? value converter that outputs a “0” when chips next to each other are not similar, outputs a “+1” when chips next to each other are of a value “+1”, and outputs a “?1” when chips next to each other are of a value “?1.

Abstract: Methods and apparatus are provided for interfacing a plurality of encoded serial data streams, such as Serial Gigabit Media Independent Interface streams, to a serializer/deserializer circuit. A plurality of encoded serial data streams are transmitted by receiving the plurality of encoded serial data streams that have been encoded using an encoding scheme that provides a substantially uniform distribution of a first code and a second code; marking at least one of the encoded serial data streams (such as changing a first code to a predefined code); and combining at least two of the plurality of encoded serial data streams into a single data stream.

Abstract: Equal-length group data obtained by grouping together slot pairs connected by a wiring pattern of equal length is stored in advance. Error rate is determined while changing a pre-emphasis (PE) setting value and an equalizer (EQ) setting value of a signal transmitted between a specified slot pair. The slot pairs belonging to the same equal-length group as the specified slot pair are selected based on the equal-length group data, and optimum PE and EQ setting values, determined based on the error rate, are set for the signals transmitted between the selected slot pairs.

Abstract: A circuit arrangement for suppressing interfering signals in the receiving branch of a modem containing a transmitting branch and the receiving branch, of a household appliance equipped with a transmitting device for transmitting and a receiving device for receiving data signals. When using a receiving circuit of the modem with an input circuit having a relatively high input impedance compared with the impedance of a useful signal source delivering data signals, to which data signals are supplied by the useful signal source having a relatively low impedance in comparison and in the presence of the interfering signal sources which deliver the interfering signals which have a relatively high impedance, an ohmic resistance is connected in parallel to the input circuit with a relatively low resistance compared to the input impedance.

Abstract: The present technology relates to protocols relative to utility meters associated with an open operational framework. More particularly, the present subject matter relates to protocol subject matter for advanced metering infrastructure, adaptable to various international standards, while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field. The present subject matter supports meters within an ANSI standard C12.22/C12.19 system while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field, all to permit cell-based adaptive insertion of C12.22 meters within an open framework. Cell isolation is provided through quasi-orthogonal sequences in a frequency hopping network.

Abstract: A method of selecting linked metric measurements from at least one of open loop and closed loop measurements is disclosed. The method includes sending by a first node a first radio communication and receiving by a second node the first radio communication over a communication link. The method also includes estimating by a second node dynamics of the communication channel using at least one of the variance and mean deviation of linked metric measurements. The link metric measurements are at least one of symbol error rate (SER), packet error rate (PER), frame error rate (FER), bit error rate (BER), signal to noise ration (SNR), and received signal strength (RSS). The method also includes the use of the above link metric measurements by the second node as Open Loop metrics and the sending back of these metrics to the first node for use a Closed Loop metrics by the first node. The method also includes categorizing the dynamics of the communications channel into one of at least two groups based on the estimate.

Abstract: Method and apparatus for determining a downlink channel response in an orthogonal frequency division multiplexing access (OFDMA) system. The method and apparatus uses the uplink quality indication channel for determining the downlink channel response, or uses round trip pilot relay channel sounding. The uplink quality indication channel may comprise modified mini-tiles. The subscriber station using round trip pilot relay channel sounding sends composite transponder pilots after receiving the DL pilots.

Abstract: A semiconductor integrated circuit has first and second delay circuits that have n (n is an integer equal to or larger than 2) delay elements connected in series, respectively, and in which an identical input signal is inputted to delay elements at a first stage and output signals of delay elements at a kth (k is an integer satisfying a condition 1?k?n?1) stage are inputted to delay elements at a k+1th stage and a detection circuit that has n edge detecting units and a readout unit and in which a jth (j is an integer satisfying a condition 1?j?n) edge detecting unit is inputted with an output signal of a delay element at a jth stage of the first delay circuit and an output signal of a delay element at an n?j+1th stage of the second delay circuit, detects whether periods of rising or falling changes of the two signals overlap, and counts a number of times of the detection, and the readout unit reads out the counted number of times of the detection.

Abstract: A system, a multi-stage equalizer and a method for generating an equalized signal in response to a received signal are provided. The multi-stage equalizer comprises a first DFE, and a second DFE. The first DFE generates a first signal in response to the received signal. The second DFE generates a second signal in response to the first signal, subtracts the second signal from a third signal to generate a fourth signal, and generates the equalized signal in response to the fourth signal, wherein the fourth signal is an unsliced signal. The method comprises steps of: providing a first DFE to generate a first signal in response to the received signal; providing a second DFE to generate a second signal in response to the first signal and to subtract the second signal from a third signal to generate a fourth signal; and generating the equalized signal in response to the fourth signal.

Abstract: Orthogonal frequency division multiplexing (OFDM) has been specified by IEEE 802.11a standard as the transmission technique for high-rate wireless local area networks (WLANs). Performance of an OFDM system, however, is heavily degraded by random Wiener phase noise, which causes both common phase error (CPE) and inter-carrier interference (ICI). A method and algorithm is disclosed for efficiently eliminating the effect of phase noise in OFDM based WLANs.

Abstract: The present invention provides a method for generating a digital program having at least one interactive application, said interactive application is based of at least one data object, said method comprises: first, receiving setting on the sharing characteristic of said data object, then generating a corresponding interactive application according to said setting, finally, associating the generated interactive application with said digital program. The setting of said sharing characteristic includes “sharable” and “non-sharable”. The present invention adds a sharing characteristic parameter to each data object in an interactive application at the transmitting end, so that corresponding processing could be easily performed at the receiving end according to the sharing characteristic of each data object.

Abstract: An explicit signaling element for controlling decoded picture output and applications when picture output is not desired. A signal element, such as a syntax element in a coded video bitstream, is used to indicate (1) whether a certain decoded picture is output; (2) whether a certain set of pictures are output, wherein the set of pictures may be explicitly signaled or implicitly derived; or (3) whether a certain portion of a picture is output. The signal element may be a part of the coded picture or access unit that it is associated with, or it may reside in a separate syntax structure from the coded picture or access unit, such as a sequence parameter set. The signal element can be used both by an encoder and a decoder in a video coding system, as well as a processing unit that produces a subset of a bitstream as output.

Abstract: One or more methods and systems to efficiently process MPEG video in order to perform a reverse play or slow rewind function are presented. The method reduces system bandwidth required to implement the reverse play function when SD MPEG video is received by the MPEG decoder. Furthermore, the method maximizes the use of memory resources when one or more video frame buffers are implemented. The system comprises a first subsystem feeding one or more sequences of frames (e.g., feeding sessions) to a second subsystem. The first subsystem defines a set of parameters that is used to determine the one or more feeding sessions provided to the second subsystem. The second subsystem subsequently decodes the one or more feeding sessions using the set of parameters such that the video may be displayed.

Abstract: A file format structure for use with scalable video coding systems and methods, where a rate share operation box indicates which adaptation operation points for coded media are available in a file. The rate share operation box can include a characterization of the adaptation result for each adaptation operation point. In addition, the rate share operation box can include an identifier that indicates which algorithm was used in generating each adaptation operation point.

Abstract: The present invention concerns a method of coding a plurality of digital image signals in a bitstream, said signals each corresponding to a view of a scene, the said coding method comprising the use of a pre-determined predictive coding structure, the views being associated with input views in the coding structure. The coding method according to the invention comprises, for at least one pair of views of the scene, steps of determining a spatial intersection zone (E44) and of calculating a value representing the similarity between the signals corresponding to said views (E45), according to at least some of the signals contained in said spatial intersection zone. These steps are followed by a step of associating (E46) at least one view with an input view of the predictive coding structure according to at least one calculated similarity value. The invention applies both to fixed image signals and to image sequences.

Abstract: A method and apparatus are provided for implementing B-picture scene changes. A prediction stage predicts a B-picture scene change based upon a sequence of statistical information in an encoder order and a reaction stage is responsive to the prediction stage for modifying a quantization scale of a rate control algorithm.

Abstract: Access point pictures designated as randomly accessible positions are I pictures or P pictures. Information indicating the decoding sequence (I1, P1, B1, B2, B3, B4, P2, . . . ) of pictures functioning as access points and attribute information (picture_type) indicating whether a picture functions as an access point or is necessary for decoding of the access point following a given access point are recorded on the video information recording medium. Random access is possible even if the GOP interval is lengthened.

Abstract: A system and method for implementing low complexity multi-view video coding. According to various embodiments, single-loop decoding is applied to multi-view video coding. For N coded views, where only M of the N views are to be displayed, only those M views are required to be fully decoded and stored to a decoded picture buffer (DPB) when needed. Pictures of other views are only partially decoded or simply parsed and do not have to be stored into the DPB. Various embodiments also provide for an encoder that encodes multi-view video bitstreams in accordance with the single-loop decoding concept, as well as a decoder that utilizes single-loop decoding to decode and output on a subset of the encoded views from a multi-view bitstream.

Abstract: An apparatus and method are for intra-frame spatial scalable video encoding. The method codes a low resolution base layer video bitstream from low resolution base layer video using a single layer encoder, and codes an enhancement layer in which individual videos frames are represented by wavelet coefficients for an LL residual sub-band, an HL sub-band, an LH sub-band; and an HH sub-band. The LL residual sub-band is generated as a difference of an LL sub-band and a recovered version of the base layer video bitstream.

Abstract: A method and apparatus for accessing a memory for processing moving pictures, which loads data from a frame buffer of an external memory, and uses a motion prediction technique. The method includes the steps of: loading, from the frame buffer, pixels of a relevant block of 8×8 size and extra pixel data necessary for an inter prediction while performing the inter prediction of a block of an 8×8 size following division of a macroblock, storing the pixels of the relevant block size of 8×8 and the extra pixel data in an internal cache memory. The stored pixels of the relevant block size of 8×8 and the stored extra pixel data are used; and then the stored pixels of the relevant block size of 8×8 and the stored extra pixel data stored in the cache memory are re-used during an inter prediction of the relevant block size of 8×8 and sub-blocks.

Abstract: Disclosed is a graphics processing unit comprising an instruction decoder and sum-of-absolute-differences (SAD) accleration logic. The instruction decoder is configured to decode a SAD instruction into parameters describing an M×N and an n×n pixel block in U,V coordinates. The SAD accleration logic is configured to receive the parameters and compute SAD scores. Each SAD score corresponds to the n×n block and to one block contained within the M×N pixel block and horizontally offset within the n×n block. Also disclosed is a GPU comprising a host processor interface receiving video acceleration instructions and a video acceleration unit. The unit is responsive to the instructions and comprises SAD accleration logic configured to receive the parameters and compute SAD scores. Each SAD score corresponds to an n×n pixel block and to one block contained within an M×N block and horizontally offset within the n×n block. M, N, and n are integers.

Abstract: A First Improvement is Described for Prediction of Motion Vectors to be Used in Prediction of video data for enhancement layer data. Arbitrary pixelblock partitioning between base layer data and enhancement layer data raises problems to identify base layer motion vectors to be used as prediction sources for enhancement layer motion vectors. The disclosed method develops enhancement layer motion vectors by scaling a base layer pixelblock partition map according to a size difference between the base layer video image and the enhancement layer video image, then identified scale base layer pixelblocks that are co-located with the enhancement layer pixelblocks for which motion vector prediction is to be performed. Motion vectors from the scaled co-located base layer pixelblocks are averaged, weighted according to a degree of overlap between the base layer pixelblocks and the enhancement layer pixelblock.

Abstract: Methods and apparatus for video frame rate conversion are disclosed. In one aspect of the invention, a basic interpolation motion vector for an interpolated frame is generated using a motion vector of a current frame. The motion vector of the current frame is compared with a motion vector of a previous frame. The basic interpolation motion vector is offset and corrected according to a comparison result. The interpolated frame is generated by performing motion compensation using at least one of the basic interpolation motion vector and the corrected basic interpolation motion vector.

Abstract: Disclosed is a method for interpolating chrominance signals in a video encoder and a decoder. The method includes the steps of accessing a memory unit to load an integer pixel value with regard to a plurality of motion compensation blocks, searching for a location of a motion vector s to perform sub-pixel interpolation of chrominance signals regarding the blocks and performing ¼ sub-pixel interpolation by row-based and column-based shifting when the motion vector indicates a ¼ location pixel with regard to the blocks. Also disclosed is an apparatus for performing the interpolating method described and a computer program product which when loaded into a computer system performs the interpolating method described.

Abstract: In video coding image sequences, images are coded in a scaled manner to obtain video data which represents the image in multiple steps from a defined image resolution or image quality (e.g., according to the data rate), and the resolution is defined by the number of image pixels of each represented image. Coding is block-based, i.e., for a description of an approximate movement of parts of one of the images in the image sequence, at least one block structure is produced describing the movement. The block structure produced includes a block divided into partial blocks which are in turn divided into sub-blocks. A first block structure is produced temporally for at least one first resolution level and a second block structure is produced for a second resolution level. The first resolution level has a lower image pixel number and/or image quality than the second resolution level.

Abstract: An apparatus for determining an encoding mode in an H.264 encoder is provided with a 16×16 macroblock number calculating unit and a threshold updating unit. The 16×16 macroblock number calculating unit calculates means of the number of 16×16 macroblocks. The threshold updating unit compares the number of 16×16 macroblocks of a frame, which is chosen to be currently encoded, with the mean of the number of 16×16 macroblocks among or within the frames, and updates a currently set threshold according to a result of comparing. Then, calculating unit checks the number of times by which the encoding mode is determined by the 16×16 macroblock in a frame whose encoding is currently completed, and the threshold updating unit compares the number of times with the currently set threshold to increase or decrease the threshold according to a result of the comparison.

Abstract: Provided is an H.264 decoding method and device for detection of Network Abstract Layer (NAL) unit error. The method includes calculating a total macroblock count for one picture, calculating a difference between a previous frame count and a current frame count, whenever a NAL unit is received, counting a macroblock count whenever decoding the macroblock, until the one picture is made complete, setting information indicating that one erroneous picture is made complete when the counted macroblock count is less than the total macroblock count and reporting that the one erroneous picture is made complete when the difference is greater than “0”.

Abstract: Disclosed are a deblocking filtering method for image data and a deblocking filter. According to the deblocking filtering method for image data and the deblocking filter, when computation of BS values for each boundary based on one of horizontal and vertical directions from input image data is completed, it is possible to estimate BS values for each boundary based on a direction different from the currently selected direction by using the computed BS values. Further, deblocking filtering is performed based on corresponding directions according to the estimated values, so that the deblocking filtering can be completely performed with only a BS value of boundaries based on a selected one direction. Consequently, a BS value computation process necessarily required in a deblocking filtering process can be considerably reduced, and thus time required in the operation process of a deblocking filter can also be considerably reduced.

Abstract: Techniques are described to signal a maximum dynamic range of inverse discrete cosine transform (“IDCT”) output values that may be produced when a set of encoded media data is decoded. In accordance with these techniques, an encoding device may generate a media file that includes encoded media data associated with a set of one or more video frames. The media file may also include a range indication element that indicates the maximum dynamic range of IDCT output values produced when the encoded media data is decoded. A decoding device that receives the media file may, prior to decoding the encoded media data, use the range indication element to determine whether to decode the encoded media data. For instance, the decoding device may not decode the encoded media data when the decoding device is not capable of producing IDCT output values in the indicated range of IDCT output values.

Abstract: The invention relates to a method for eliminating errors in compressed video transmission. A method for eliminating errors in H.264 compressed video transmission is disclosed, to eliminating errors in a simple and efficient manner. In the invention, an error information feedback mechanism is used in combination with error concealment and error propagation suppression to eliminate errors. An error is detected and statistics of error information, such as position of lost data, is obtained by sequence numbers of NALUs and information for carrying slices. An error information feedback channel is established in H.264 architecture by defining an extended SEI message. The error propagation is suppressed by segment-wise intra-coding in batches.

Abstract: A source device 10 transmits streaming data. In a packet receiver 22 of a sync device 20, statistical data acquirer 23 calculates statistical data such as one-way delay time, packet loss ratio, reception rate and the like from the received streaming data and transmits it to the source device. The statistical information received by source device 20 is extracted by a packet receiver 15 and input to a channel band estimator 16. The channel band estimator 16 gives encoder 11 instructions to provide optimal encoding based on the transmission delay. Upon this, the transmission delay is calculated by assuming the minimum value of the communication delay from the start of transmission as zero. Control is performed by determining the delay time and packet loss ratio in data transmission and considering, based on these, the channel quality and bandwidth margin, so as to provide the optimal transmission bit rate or encoding rate.

Abstract: A control device (CD) is dedicated to the control of the transmission of coded values onto a digital interface (I) connecting a baseband device (BBD) and a baseband interface device (BAI), comprising at least a modulator (M) feeding a gain controller (GC), of a wireless communication equipment. The control device (CD) comprises a storing means (MM1) for storing a coding table establishing a correspondence between symbols for the baseband interface device (BAI) and coding values to transmit to this radiofrequency device through the digital interface (I). Tie coding table comprises a first group of symbols comprising data words for feeding the modulator (M) and a second group of symbols comprising command words for controlling the operation of the modulator (M) and/or the gain controller (GC).

Abstract: An apparatus and method for estimating a coarse carrier frequency offset in an OFDM receiver are provided, in which an Fast Fourier Transform (FFT) unit performs FFT for a received signal over one symbol duration and outputs a previously known signal included in the FFT signal, a correlation value calculator evaluates autocorrelation values of the previously known signal for plural candidate offsets, an accumulator accumulates the autocorrelation values to the autocorrelation values evaluated over a previous symbol duration, and a maximum value selector selects first and second maximum values of the autocorrelation values. A threshold tester compares a ratio between the first and second maximum values with a predetermined threshold, and determines a candidate offset corresponding to the first maximum value as the coarse carrier frequency offset if the ratio is less than the threshold. Otherwise, the threshold tester instructs the FFT unit to receive a signal over a next symbol duration.

Abstract: A multiband Orthogonal Frequency Division Multiplexing (OFDM) receiver, and more particularly, a receiver and method for effectively compensating for a frequency offset of a received signal in a multiband OFDM scheme. The receiver for compensating for a frequency offset of a received signal in an OFDM scheme includes: a numerically controlled oscillator (NCO) which generates a first compensation signal by processing an input signal in a time domain based on a first carrier frequency offset estimated in the time domain, and a second carrier frequency offset estimated in a frequency domain; a sampling frequency offset tracking (SFOT) unit which generates a second compensation signal by estimating a sampling frequency offset from frequency domain pilot symbols contained in the first compensation signal; and a carrier frequency offset tracking (CFOT) unit which estimates the second carrier frequency offset by using pilot symbols contained in the second compensation signal.

Abstract: The present invention relates to a system for selecting a switched beam for supplying a maximum received power to a subscriber station, and a method thereof. The number of switched beams used by a base station is limited, and a weight value vector for forming the switched beam is predefined. The subscriber station uses a pilot signal for discerning transmitting antennas to estimate channel values for the respective transmitting antennas, and uses the channel values and the predefined weight value vectors to determine a switched beam for supplying a maximum signal-to-noise ratio (SNR). The subscriber station notifies the base station of an identifier of a selected beam by using a feedback channel, and the base station uses the switched beam to transmit traffic data.

Abstract: A portable device, such as a mobile terminal or user equipment, for encoding uplink acknowledgments to downlink transmissions. The portable device includes a receiver configured to receive a plurality of data blocks, such that each of the data blocks include an associated cyclic redundancy check (CRC), and a processor configured to determine received status for each of the data blocks by checking the CRC of each of the data blocks. The portable device further includes a transmitter for transmitting a response sequence which indicates the received status of all of the data blocks.

Abstract: A communication apparatus has an A/D converter which converts an analog signal which was received, into a digital signal, a converter which converts a reception signal so as to enable handling of phase information, a carrier detector which detects presence or absence of the reception signal, a synchronous circuit which extract synchronization timing from the reception signal, an equalizer which corrects the reception signal so as to cancel influence of a transmission path, a transmission path estimator which estimates a state of a power line transmission path, and a judging unit which judges the reception signal, which was amended by the equalizer, by use of a threshold value.

Abstract: A method of establishing communications with a remote receiver (300) that receives data signals (612, 614) from other transmitters is disclosed. The method includes producing a preamble (602) and producing guard bands (800, 802) between the preamble and the data signals. The preamble is transmitted (111) to the remote receiver.

Abstract: The present invention provides a scattered pilot (SP) location detector capable of detecting patterns of SP symbols promptly without using a TMCC signal. The SP location detector comprises a multiplier which multiplies received signals generated by demodulating OFDM modulation signals in which pilot symbols are dispersively disposed in accordance with four types of patterns and which are transmitted periodically, by a pseudo-random number bit sequence, four arithmetic circuits which are respectively provided corresponding to the four types of patterns and which respectively extract pilot symbols corresponding to respective patterns from results of multiplication by the multiplier and calculate sums of phase differences between the extracted pilot symbols, followed by outputting absolute values thereof, and a pattern detection circuit which detects the corresponding arithmetic circuit maximum in the calculated absolute value from within the four arithmetic circuits.

Abstract: Channel estimation for high mobility OFDM channels is achieved by identifying a set of channel path delays from an OFDM symbol stream including carrier data, inter-channel interference noise and channel noise; determining the average channel impulse response for the identified set of channel path delays in each symbol; generating a path delay curvature for each channel path delay in each symbol based on stored average channel impulse responses for the identified channel path delays; estimating the carrier data in the symbols in the OFDM symbol stream in the presence of inter-channel interference noise and channel noise from the OFDM symbol steam and the average impulse responses for the identified channel path delays; reconstructing the inter-channel interference noise in response to the path delay curvature, the identified set of channel path delays and estimated carrier data to produce a symbol stream of carrier data and channel noise with suppressed inter-channel interference noise.

Abstract: A signal detection apparatus improving signal detection accuracy in a receiver for communications system complying with the MIMO scheme. The signal detection apparatus detects transmission signals sent from transmission antennas based on received signals received by receiving antennas. The apparatus includes: a first determination mechanism for determining symbol candidates of the transmission signals in sequence based on the QRM-MLD method using the received signals arranged in first order; a second determination mechanism for determining symbol candidates of the transmission signals in sequence based on the QRM-MLD method using the received signals arranged in second order that is different from the first order; and an output mechanism for outputting symbol candidates and likelihood of the transmission signals based on determination results of at least the first and the second determination mechanisms.

Abstract: A pre-coding method for a MIMO system and an apparatus using the same are described. In the method, a receiver determines a corresponding codebook from a multi-codebook including multiple codebooks according to a location of a resource block, selects a corresponding codeword index from the determined codebook and transmits the index to a transmitter; the transmitter determines the corresponding codebook from the multi-codebook including multiple codebooks according to the location of the resource block where transmission data is to be transmitted, selects a corresponding codeword from the determined codebook according to the codeword index and performs pre-coding for the transmission data with the selected codeword. The pre-coding is performed with the multi-codebook in the present invention, which increases a diversity of pre-coding matrixes, so dynamic fluctuation range of a equivalent channel is improved and thus the performance of multi-user scheduling is enhanced effectively.

Abstract: Precoding codes for MIMO transmitters are generated using an asymptotically optimal decoding algorithm, such as a trellis-exploration algorithm similar to the Viterbi algorithm. A trellis may be constructed using a number of desired subchannels, at least one code length, and a number of code-chip parameters. A fitness function is derived from a mathematical relationship between codes, and may include some measure of correlation of the codes. The selected codes correspond to paths having optimal path metrics derived from the fitness function. Multiple iterations through the trellis may be performed to refine a selection of the codes.

Abstract: In a wireless communication device, transmit weights are iteratively processed to compensate for any group delay caused by receive synchronization in the receive device. A transmit matrix of weights is computed from signals transmitted by a second communication device and received at a plurality of antennas of the first communication device. The transmit matrix processing includes normalizing a transmit weight vector with respect to a mode of the transmit weight associated with one of the plurality of antennas.