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104 results about "Channel correlation matrix" patented technology
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Adaptive multi-beamforming systems and methods for communication systems
InactiveUS20070207730A1Substation equipmentRadio transmission for post communicationCommunications systemEngineering
A wireless communication system including receiving and base stations. The receiving station includes a detector that measures a downlink channel correlation matrix for multiple antennas of a base station. The detector computes an antenna weight increment vector normal to an antenna weight vector for multiple beams from the multiple antennas of the base station. The detector quantizes the antenna weight increment vectors to produce a respective quantized antenna weight increment vector. The receiving station includes a transmitter that sends the quantized antenna weight increment vectors to the base station. The base station includes a beamformer selector that receives from the receiving station and re-orthogonalizes the quantized antenna weight increment vector for each of the multiple beams. The base station includes a weight vector modifier that modifies the antenna weight vector for the multiple beams by adding an increment proportional to the respective re-orthogonalized quantized antenna weight increment vector.
Owner:NOKIA CORP
Adaptive Precoding Codebooks for Wireless Communications
ActiveUS20100238913A1Easy to useDiversity/multi-antenna systemsLink quality based transmission modificationTelecommunicationsPrecoding matrix
Adaptive precoding codebooks are described. In one embodiment, the method of wireless communication includes reading at least a rank-2 baseline codebook having codewords representing precoding matrices. An adaptive codebook is generated by multiplying a first column of the codeword with a first transform matrix calculated from a channel correlation matrix, and multiplying a second column of the codeword with a second transform matrix calculated from the channel correlation matrix. The first and the second transform matrices are orthogonal.
Owner:FUTUREWEI TECH INC
Techniques for transformation codebook antenna beamforming in OFDM wireless communication system
ActiveUS20110110451A1Diversity/multi-antenna systemsChannel estimationCommunications systemTransmitter station
Methods for a transmitter station and a receiver station to perform beamforming in a wireless communication system, and a transmitter station and a receiver station to perform the corresponding method, are provided. The method for the transmitter station to perform beamforming in the wireless communication system includes estimating and tracking a long-term averaged and normalized channel correlation matrix between the transmitter station and a receiver station, determining beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix, and communicating with the receiver station using the determined beamforming coefficients, wherein the receiver station also estimates and tracks the long term averaged and normalized channel correlation matrix, and determines beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix.
Owner:SAMSUNG ELECTRONICS CO LTD
Single user detection user equipment
A time division duplex using code division multiple access user equipment receives a plurality of data signals in a time slot. Each data signal experiences a similar channel response. The user equipment receives a combined signal over the shared spectrum in a time slot. The combined signal comprises the plurality of data signals. The combined signal is sampled at a multiple of a chip rate of the combined signal. The similar channel response is estimated. A channel response matrix or a channel correlation matrix is constructed based on in part the estimated channel response. A spread data vector is determined based on in part a fast fourier transform (FFT) decomposition of a circulant version of the channel response or channel correlation matrix. The spread data vector is despread to recover data from the matrix.
Owner:INTERDIGITAL TECH CORP
Method for closed-loop subspace transmission and reception in a two transmit N-receive antenna system
InactiveUS6847805B2Accurate channel quality feedback informationEasy to useSpatial transmit diversityTransmission monitoringFeature vectorDecomposition
A method for generating channel quality feedback information in terms of quantized eigenvectors calculated from an eigenvalue decomposition that uses a channel matrix and an eigenvalue matrix to generate quantized and bounded eigenvectors. The channel correlation matrix and the eigenvalue matrix are obtained from a channel matrix formed from channel measurements of various signal parameters of signals transmitted over the communication channel. The eigenvalue decomposition uses the elements of the channel correlation matrix, the elements of the eigenvalue matrix and conditional relationships between elements of the channel correlation matrix to calculate the quantized and bounded eigenvectors. Because the elements of the quantized bounded eigenvectors can be expressed in terms of each other, not all elements of the quantized bounded vectors need be transmitted over the communication channel resulting in efficient use of the communication channel.
Owner:LUCENT TECH INC +1
Precoding in high-order MIMO
ActiveUS20100002801A1Spread the wordOverhead requiredSecret communicationRadio transmissionEngineeringCovariance
A high-order Multiple-Input-Multiple-Output (MIMO) transmitter implementing a covariance-based precoding scheme that exploits transmit channel correlation and a method of operation thereof are provided. In one embodiment, covariance-based precoding is performed at the high-order MIMO transmitter based on feedback from a remote high-order MIMO receiver regarding a covariance-based precoding matrix. The covariance-based precoding matrix is, or is derived from, a transmit channel correlation matrix determined by the high-order MIMO receiver for the high-order MIMO transmitter. The covariance-based precoding provides a beam-forming effect when there is a relatively high degree of transmit channel correlation, thereby improving performance of the high-order MIMO transmitter. Further, because changes in the transmit channel correlation occur relatively slowly over time, feedback overhead requirements are substantially reduced as compared to that required for traditional MIMO precoding schemes.
Owner:APPLE INC
Single user detection user equipment
InactiveUS20020126619A1Network traffic/resource managementRadio transmissionFrequency spectrumCode division multiple access
A code division multiple access user equipment is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A column of a channel correlation matrix is determined using the estimated channel response. A spread data vector is determined using the determined column, the estimated channel response, the received combined signal and a fourier transform. Data of the data signals is estimated using the spread data vector.
Owner:INTERDIGITAL TECH CORP
Method, system and device for selecting precoding vector and mobile terminal
ActiveCN101771442AReduce the number of bitsImprove throughputSpatial transmit diversityInformation gainComputer science
The invention discloses a method, a system and a device for selecting a precoding vector and a mobile terminal. The method for selecting the precoding vector comprises that: a receiving end performs quantization treatment on a channel correlation matrix according to the stored vector quantization codebook aiming at the channel correlation matrix; the receiving end feeds back the information of the channel correlation matrix subjected to the quantization treatment to a transmitting end; and the transmitting end acquires the channel correlation matrix according to the stored vector quantization codebook aiming at the channel correlation matrix and the received information subjected to the quantization treatment, and selects the precoding vector according to the acquired channel correlation matrix. Due to the technical scheme, the amount of the quantization information fed back by the receiving end is reduced, and the amount of the quantization information fed back by the receiving end is not increased along the increase of the antenna amount of the receiving end.
Owner:HUAWEI TECH CO LTD
Adaptive multi-beamforming systems and methods for communication systems
InactiveUS7738925B2Substation equipmentRadio transmission for post communicationCommunications systemSelf adaptive
A wireless communication system including receiving and base stations. The receiving station includes a detector that measures a downlink channel correlation matrix for multiple antennas of a base station. The detector computes an antenna weight increment vector normal to an antenna weight vector for multiple beams from the multiple antennas of the base station. The detector quantizes the antenna weight increment vectors to produce a respective quantized antenna weight increment vector. The receiving station includes a transmitter that sends the quantized antenna weight increment vectors to the base station. The base station includes a beamformer selector that receives from the receiving station and re-orthogonalizes the quantized antenna weight increment vector for each of the multiple beams. The base station includes a weight vector modifier that modifies the antenna weight vector for the multiple beams by adding an increment proportional to the respective re-orthogonalized quantized antenna weight increment vector.
Owner:NOKIA CORP
Pre-coding method and device
ActiveCN101873190AUnlimited quantityReduce orderError preventionCode conversionGeneralized eigenvectorComputer science
Owner:HUAWEI TECH CO LTD
Channel correlation-based user group partition method under D2D
ActiveCN105848097AInterference coordinationSuitable for proximity needsSpatial transmit diversityWireless commuication servicesMultiple signal classificationTwo step
The invention discloses a channel correlation-based user group partition method under D2D. The method comprises the following steps: (1) enabling users to measure a pilot frequency transmitted by a base station, and feeding back channel correlation matrixes and receiving signal intensities by means of an uplink; (2) obtaining the estimated positions of all the users according to an MUSIC (multiple-signal-classification) method and an RSS (receive-signal-strength) method, and adopting a binary group to indicate user positions; (3) carrying out clustering processing on the user by using a K-means method. The user group partition method provided by the invention can complete the partition of a two-step pre-coded user group of a cellular network and the discovery of a D2D cluster at the same time by utilizing cellular channel correlation matrix information, thus avoiding a complicated operation of directly utilizing channel correlation information to process medium and high-dimension matrix subspace division and projection; the method has the characteristics of being simple and efficient.
Owner:HUAZHONG UNIV OF SCI & TECH
Precoding in High-Order MIMO
ActiveUS20160226567A1Exploits long-term transmit channel correlationSpread the wordSpatial transmit diversityTransmitter/receiver shaping networksCovarianceEngineering
Owner:APPLE INC
Sequential multi-antenna selectable transmitting method for code division multi-path channel
ActiveCN102223170AImprove practicalityImprove robustnessSpatial transmit diversityData streamChannel parameter
The invention provides a sequential multi-antenna selectable transmitting method for code-division multi-path channel. The sequential multi-antenna selectable transmitting method is used for the combined antenna selection and beam shaping of a TD-HSPA+ and comprises the steps of replacing the downlink practical wireless multi-path channel parameters with the obtained uplink channel parameters; calculating the equivalent channel related matrix of a system; selecting the transmitting antenna to join in the data transmission by a sequential way; selecting the transmitting antenna according to the second characteristic value criteria of maximum equivalent channel related array; after selecting the antenna, calculating the related array RK of the selected antenna; carrying out beam shaping according to the characteristic vector of the RK and sending data stream. The sequential multi-antenna selectable transmitting method meets the experience truth that the system performance mainly depends on the data path of the dual streams with the worst sending channel quality, sufficiently considers the common influence factor of the multipath channel is sufficiently considered, and the system performance is improved greatly. Furthermore, according to the sequential antenna selecting method, the practical complexity the simplified and the feasibility is improved.
Owner:SOUTHEAST UNIV
Low complexity channel estimation method in large scale MIMO system
ActiveCN105471775AReduce performance lossReduce complexityChannel estimationComputation complexitySample matrix inversion
The invention discloses a low complexity channel estimation method in a large scale MIMO system. The method comprises the following steps of firstly, establishing an optimization estimation problem of a channel covariance matrix; and secondly, according to an iteration relation of covariance estimation, using a Sherman-Morrison theorem to convert matrix inversion into a matrix and vector product form so that a method complexity is reduced. In the method, approximation estimation is performed on a channel correlation matrix and the Sherman-Morrison theorem is used to convert the matrix inversion in a MMSE method into the matrix and vector product so that a calculating complexity in the MMSE method is greatly reduced and a low performance loss is possessed.
Owner:NANJING UNIV OF POSTS & TELECOMM
Techniques for transformation codebook antenna beamforming in OFDM wireless communication system
Methods for a transmitter station and a receiver station to perform beamforming in a wireless communication system, and a transmitter station and a receiver station to perform the corresponding method, are provided. The method for the transmitter station to perform beamforming in the wireless communication system includes estimating and tracking a long-term averaged and normalized channel correlation matrix between the transmitter station and a receiver station, determining beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix, and communicating with the receiver station using the determined beamforming coefficients, wherein the receiver station also estimates and tracks the long term averaged and normalized channel correlation matrix, and determines beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix.
Owner:SAMSUNG ELECTRONICS CO LTD
Signal processing method, receiver and equalizing method in receiver
InactiveUS20070253514A1Reduce in quantityReduced implementation timeMultiple-port networksDelay line applicationsEqualizationCirculant matrix
A signal processing method, receiver and equalizing method are provided. The receiver comprises an estimator estimating a channel coefficient matrix from a received signal, a first calculation unit determining a channel correlation matrix based on the channel coefficient matrix a converter converting the channel correlation matrix into a circulant matrix. A second calculation unit determines equalization filter coefficients by applying a first transform to the real parts of a first subset of the terms in the first column of the circulant matrix and by applying a second transform to the imaginary parts of a second subset of the terms in the first column of the circulant matrix. An equalizer equalizes the received signal by using the determined equalization filter coefficients.
Owner:WSOU INVESTMENTS LLC
Method for judging down space division multiple access mode of TDD system
InactiveCN101414874AEfficient use ofJudgment of air separation characteristicsSpatial transmit diversityRadio transmission for post communicationSystem capacityCode division multiple access
The invention discloses a method for judging the mode of down space division multiple access of a time division duplex system, which includes the steps: the operation of channel estimation is carried out to a special physical channel for up adjoint to obtain the channel impulse response matrix of each user; the normalized spatial correlation matrix of each user is calculated; the eigenvalue of each spatial channel correlation matrix is analyzed so as to gather out and take the corresponding eigenvector of each eigenvalue of maximum as the forming weight of each user; the spatial correlation measure of every two users is calculated according to the forming weight of each user; and any user and the user with the spatial correlation measure less than a preset value are classified into the same set, and the actuating codes of the users in the same set are multiplexed by the mode of space division multiple access. The method can judge whether the users can adopt the SDMA mode to carry out the operation of data down-load or not according to the space division properties of the users, and the TDD HSDPA system can effectively utilize spatial information to increase the throughput of data transmission of the system and can increase the capacity of the system.
Owner:ZTE CORP
Channel feedback method and device based on hybrid beamforming
ActiveCN106850010AReduce Feedback OverheadReduce the number of RF channelsSpatial transmit diversityHybrid beamformingSelf adaptive
The embodiment of the disclosure provides a channel feedback method and device based on hybrid beamforming. The method comprises the following steps: estimating a physical channel correlation matrix of a long-time broadband; feeding back the physical channel correlation matrix of the long-time broadband to a base station; estimating a short-time narrow-band equivalent channel after analog beamforming; and feeding back the short-time narrow-band equivalent channel to the base station based on an adaptive codebook. The embodiment of the disclosure also provides a corresponding channel feedback method and a corresponding device. According to the channel feedback solution based on hybrid beamforming provided by the embodiment of the disclosure, the feedback overhead can be significantly reduced, the number of RF channels in the system can be reduced, and the system performance which is better than a traditional pure digital beamforming scheme can be obtained with the same feedback overhead.
Owner:ALCATEL LUCENT SHANGHAI BELL CO LTD
Method and device for determining valid signal-to-noise ratio
ActiveCN102238114AReduce computational complexityChannel capacity equivalentError preventionBaseband system detailsComputation complexitySignal-to-noise ratio (imaging)
The invention discloses a method for determining a valid signal-to-noise ratio, comprising the following steps of: in an OFDM (orthogonal frequency division multiplexing) system, determining a channel correlation matrix estimation value of a measured bandwidth according to the channel estimation result of a time frequency sub-channel at a pilot frequency position in the measured bandwidth; respectively calculating channel capacity of the time frequency sub-channel of each interference type of the measured bandwidth by using the channel correlation matrix estimation value; obtaining an average equivalent channel capacity of each time frequency sub-channel on the measured bandwidth according to the channel capacity of the time frequency sub-channel of each interference type; and determining the valid signal-to-noise ratio of the measured bandwidth according to the average equivalent channel capacity of each time frequency sub-channel. The invention further discloses a device for determining a valid signal-to-noise ratio. With the method and the device provided by the invention, computational complexity for the valid signal-to-noise ratio can be reduced.
Owner:ZTE CORP
Method and device for transmitting data by space-time coding operation
InactiveCN101594207AReduce bit error rateError prevention/detection by diversity receptionCurrent channelSignal-to-noise ratio (imaging)
The invention discloses a method for transmitting data by space-time coding operation, including: calculating all signal power element values and all interference power element values of each equivalent channel correlation matrix according to the current channel condition; selecting an equivalent channel correlation matrix meeting set condition according to the signal power element value and the interference power element value; and carrying out space-time coding on the data to be sent by utilizing the space-time coding matrix corresponding to the selected equivalent channel correlation matrix and sending the data. By the invention, error rate of an MIMO transmission system is reduced while the signal to noise ratio is determined. The invention also discloses a device for transmitting data by the space-time coding operation.
Owner:CHINA MOBILE COMM GRP CO LTD
Method and system for obtaining communication channel correlation coefficient in uplink MIMO (Multiple Input Multiple Output)
The invention relates to a method for obtaining a communication channel correlation coefficient in an uplink MIMO (Multiple Input Multiple Output). The method comprises the following steps of: obtaining a communication channel response matrix of emission signal pilot data, carrying out an autocorrelation to obtain an autocorrelation matrix of the communication channel response matrix, accumulating autocorrelation matrixes of all pilot frequencies and averaging the accumulation to obtain a correlation matrix of an MIMO communication channel; carrying out noise power compensation on the obtained correlation matrix of the MIMO communication channel; carrying out eigenvalue decomposition on the compensated correlation matrix of the MIMO communication channel, and calculating a condition number of the correlation matrix of the MIMO communication channel based on the obtained eigenvalue as a correlation coefficient of the MIMO communication channel. The invention also provides a system for obtaining the correlation coefficient of the communication channel in the uplink MIMO. By using the technical scheme of the invention, the correlation matrix of the MIMO communication channel can be obtained by calculating the correlation matrix of the communication channel of pilot frequency data in uplink MIMO data, and then a condition number is obtained by carrying out the matrix eigenvalue decomposition to obtain the correlation coefficient of the MIMO communication channel.
Owner:ZTE CORP
Incoherent multiple-user detection method and device for non-orthogonal multi-pulse modulation
ActiveCN106788882AEasy to detectImprove performanceError preventionTransmitter/receiver shaping networksMatched filterPulse time modulation
The invention discloses an incoherent multiple-user detection method and device for non-orthogonal multi-pulse modulation. The method comprises the steps of receiving multi-user overlapped signals through the non-orthogonal multi-pulse modulation; establishing a pseudo linear model for receiving signals; passing through a group of matching filters by the receiving signals to obtain a channel related matrix; carrying out QR decomposition on the related matrix and converting the related matrix into an upper triangular matrix structure; feeding back judged user information among users, thereby eliminating multi-access interference among the users; eliminating correlation of the signals of the users through decorrelation inversion operation; and carrying out maximum judgment on the detected signals and selecting the maximum from M possible results as judgment output. According to the method and the device, the detection performance of the users with relatively low power is greatly improved by feeding back the judgment signals of the users with relatively high power. The multi-access interference among the users is eliminated effectively through judgment feedback. Even if the interference users are many, the good stability can be still achieved. The method and the device are applied to the technical field of wireless communication.
Owner:XIDIAN UNIV
A method for eliminating non-orthogonal space-time block coding self-interference item based on matrix rotation
InactiveCN1545366AEliminate self-interference termsIncrease transfer rateSpatial transmit diversityCode division multiplexSelf interferenceSpace time transmit diversity
The invention is a matrix rotation based method for eliminating self-interference of a nonorthogonal space-time packet code, in view of the problem that there are self-interference items in the channel correlation matrix of nonorthogonal (or quasi-orthogonal) space-time packet code, adopting Givens rotation twice. Thus, one hand, it can effectively eliminate the self-interference items and rotates channel matrix into orthogonal matrix. During space-time transmit diversity, the maximum advantage caused by the channel matrix being an orthogonal matrix is that it can make linear decoding at receiving end, largely reducing decoding complexity. And at the same time it make the packet code corresponding to the channel matrix have an orthogonal structure, accordingly able to obtain maximum transmitting speed, partial diversity gain and receiving-end linear decoding.
Owner:XI AN JIAOTONG UNIV
Methods and apparatuses for generating and feeding back high rank adaptive codebook in multiple input multiple output system
InactiveUS20130051487A1Improve performanceQuality improvementSpatial transmit diversityError prevention/detection by diversity receptionFeature vectorSelf adaptive
A method and device for generating and feeding back high rank adaptive codebook in multiple input multiple output system are disclosed in the embodiments of the invention. The method for generating high rank adaptive codebook includes: using different levels of a long time channel correlation matrix to transform different row vectors in high rank basic codebook, so as to aim at the directions of different eigenvectors of the long time channel correlation matrix; and using the transformed row vectors to construct the high rank adaptive codebook. The method of the invention has well system performance gain and no any additional feedback cost.
Owner:ALCATEL LUCENT SAS
Multi-antenna diversity combination receiving method and device
ActiveCN102832986AGood diversity gainReduce the amount of calculationSpatial transmit diversityAlgorithmDiversity combining
The invention discloses a multi-antenna diversity combination receiving method and a device. The method is characterized in that the diversity combination step is carried out in the associated detection in advance, that is to say that diversity combination is carried out after completing matched filtering of each antenna data and calculating the channel correlation matrix corresponding to each antenna in associated detection process; and decomposition and linear equation resolving are carried out according to the combined channel correlation matrix and the combined matched filtering result to obtain a sign to be demodulated, thereby obviating the operations of decomposition and linear equation resolving for each antenna according to the matched filtering result and the channel correlation matrix of each antenna. The multi-antenna diversity combination receiving method provided by the embodiment has better diversity gain in comparison with single antenna receiving, and can remarkably reduce the calculation amount and the realization complexity of the system in comparison with the existing diversity combination receiving system under the condition of same diversity gain performance.
Owner:LEADCORE TECH
Beam forming method of compact planar array Massive MIMO system
ActiveCN113315560AIncrease and rateGuaranteed robustnessSpatial transmit diversityAlgorithmSignal-to-interference-plus-noise ratio
The invention discloses a beam forming method for a compact planar array Massive MIMO system. The beam forming method comprises the following steps: constructing a high-frequency sparse channel model on the basis of not considering a mutual coupling effect; performing asymptotic analysis on the high-frequency sparse channel model to obtain an asymptotic equivalence formula of a channel correlation matrix; based on an asymptotic equivalence formula, establishing an optimization model by taking maximization of the minimum receiving SINR values of all users as a target; carrying out equivalent transformation and solving on the optimization model to obtain a beam forming weight vector; based on the beamforming weight vector, performing beamforming processing on the user data, and performing signal transmission. According to the method, an asymptotic equivalence formula of a channel correlation matrix is derived through asymptotic analysis of a high-frequency sparse channel, and on the basis, a beamforming optimization problem is established by taking maximization of a user receiving signal to interference plus noise ratio as a target, so that the robustness of system performance to mutual coupling damage is ensured while the user sum rate is improved.
Owner:广州市埃特斯通讯设备有限公司
Grouping decoding method based on partial interference elimination and receiver
ActiveCN101867459AReduce dimensionalityReduce implementation complexityError prevention/detection by diversity receptionDecoding methodsInterference elimination
The embodiment of the invention discloses a technical scheme of a grouping decoding method based on partial interference elimination and a receiver. The grouping decoding method based on partial interference elimination comprises the following steps: carrying out triangular decomposition on a correlation matrix of a channel, inverting the decomposed matrix, extracting a submatrix related to a group of signals from the inverted matrix aiming at each group of which the transmitting signals are divided into, acquiring a receipt signal vector and an equivalent channel matrix corresponding to the group after between-group interference is eliminated according to the matrix after orthogonal decomposition of the submatrix, and detecting the transmission vector of the group of the signals by utilizing a multiple input and multiple output detection method according to the receipt signal vector and the equivalent channel matrix corresponding to the group after the between-group interference is eliminated. The technical scheme lowers the realization complexity of grouping decoding and saves the processing resources of the receiver.
Owner:HUAWEI TECH CO LTD
Signal processing method, receiver and equalizing method in receiver
InactiveUS7720140B2Reduce energy consumptionReduce in quantityMultiple-port networksDelay line applicationsEqualizationCirculant matrix
A signal processing method, receiver and equalizing method are provided. The receiver comprises an estimator estimating a channel coefficient matrix from a received signal, a first calculation unit determining a channel correlation matrix based on the channel coefficient matrix a converter converting the channel correlation matrix into a circulant matrix. A second calculation unit determines equalization filter coefficients by applying a first transform to the real parts of a first subset of the terms in the first column of the circulant matrix and by applying a second transform to the imaginary parts of a second subset of the terms in the first column of the circulant matrix. An equalizer equalizes the received signal by using the determined equalization filter coefficients.
Owner:WSOU INVESTMENTS LLC
Method and apparatus for performing chip level equalization using joint processing
A method and apparatus for performing chip level equalization (CLE) using joint processing to enhance performance and system throughput using a transmitter having a plurality of transmit antennas and a receiver having a plurality of receive antennas. A channel response matrix is formed between the transmit antennas and the receive antennas to generate a joint channel correlation matrix between the transmit antennas and the receive antennas using a block-FFT (B-FFT) decomposition of the channel response matrix. Estimates of transmitted chip sequences from each of the transmit antennas are generated using minimum mean square error (MMSE) and the joint channel correlation matrix are combined. The combined estimate of the transmitted chip sequences are despread to recover transmitted data.
Owner:INTERDIGITAL TECH CORP
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