Patent application number | Description | Published |
20080256163 | APPARATUS AND METHOD OF GENERATING CODEBOOK FOR MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM - An apparatus and method of generating a codebook. The codebook generation apparatus includes a matrix extender to generate a candidate matrix set by multiplying a base matrix and at least one diagonal matrix, wherein the at least one diagonal matrix includes elements of a constrained set as diagonal elements; and a codebook generator to generate the codebook where a minimum distance between the elements is maximized, based on the candidate matrix set. According to aspects of the present invention, it is possible to provide a precoding codebook that can reduce an amount of feedback from a terminal. | 10-16-2008 |
20110255613 | System and Method for Feeding Back Channel Information - A system and method for feeding back channel information are provided. A method for communications device operations includes generating feedback information, encoding the feedback information to produce a feedback payload, and transmitting the feedback payload to a communications server serving a communications device. The feedback information includes at least a first long term wideband channel statistics and a second long term wideband channel statistics. | 10-20-2011 |
20110273993 | System and Method for Reporting Quantized Feedback Information for Adaptive Codebooks - A system and method for reporting quantized feedback information for adaptive codebooks include generating channel state information, encoding all or part of the channel state information to produce a feedback payload and transmitting the feedback payload to a base station from a mobile station. The channel state information comprises a rank indicator, a first matrix indicator, a wideband channel quality indicator, a second matrix indicator and at least one narrowband channel quality indicator. When the rank indicator is greater than 1, the first matrix indicator is reported in a second report. On the other hand, when the rank indicator is equal to 1, the content of the first matrix indicator is split between a second report and a third report. | 11-10-2011 |
20120027125 | CODEBOOK, CODEBOOK CREATING METHOD, UPLINK TRANSMISSION METHOD AND EQUIPMENT BASED ON THE CODEBOOK - A codebook, a codebook creating method, and an uplink transmission method and equipment based on the codebook are provided. A new codebook is put forward in the method. The codebook includes one or any combination of the following elements: | 02-02-2012 |
20120063500 | System and Method for Channel State Information Feedback in Wireless Communications Systems - A system and method for channel state information feedback in wireless communications systems are provided. A method for reporting channel information includes determining, at a user equipment, a channel information type for first channel information to be reported to a communications controller, determining the first channel information conditioned on previously reported channel information and on the channel information type, and reporting the first channel information, the channel information type, or a combination thereof, to the communications controller. | 03-15-2012 |
20120087422 | METHOD FOR GENERATING CODEBOOK, METHOD AND APPARATUS FOR DATA TRANSMISSION - A method for generating a codebook and a method and an apparatus for data transmission are provided. The method includes: receiving a label of a codeword sent by a User Equipment (UE); selecting the codeword identified by the label from the codebook for eight-antenna; and coding data to be sent by using the codeword. The codebook for eight-antenna includes at least one rank-8 codeword for eight-antenna. The rank-8 codeword for eight-antenna is generated by multiplying an inverse matrix of a rotation matrix for eight-antenna with an eight-dimensional matrix formed by rank-4 codewords for four-antenna; or generated by extending rank-4 codewords for eight-antenna, where the rank-4 codeword for eight-antenna is generated according to codewords for four-antenna. Therefore, the codeword in the codebook for eight-antenna is applicable to scenarios including dual-polarization strong correlation, dual-polarization weak correlation, single-polarization strong correlation, and single-polarization weak correlation, etc. | 04-12-2012 |
20120087429 | Method, Codebook and Base Station for Precoding - A method, a codebook, and a Base Station (BS) for precoding are provided. The precoding method includes: obtaining a total uplink power of a User Equipment (UE); if the total uplink power is greater than ¾ of a rated total transmit power of antennas, selecting a codeword from a first codebook with imbalanced power between layers; otherwise, selecting a codeword from the first codebook and a second codebook with balanced power between layers, so as for precoding data to be transmitted according to the selected codeword. | 04-12-2012 |
20120121031 | Method and Apparatus for Demodulation of a Reference Signal - A method for wireless network communication is provided. The method comprises determining, by a transmitter including a quantity of antennas, a quantity of transmitted layers; mapping a quantity of data symbols to the antennas using a quantity of precoders; generating a quantity of demodulation reference signal (DMRS) antenna ports based on the quantities of the antennas, the transmitted layers, and the precoders; and determining whether to precode at least one of the DMRS antenna ports with the precoders. The method further maps the precoded data symbols and the DMRS antenna ports to a quantity of resource elements. The method then modulates a signal comprising the resource elements and transmits the modulated signal to a receiver. Subsequently, the method estimates a channel received by the receiver over the DMRS antenna ports. | 05-17-2012 |
20120163439 | Precoding Method and Apparatus in Multiple Input Multiple Output System - Embodiments of the present invention disclose a precoding method and apparatus in a multiple input multiple output system. The method includes receiving a non-constant modulus channel information matrix fed back by a UE; processing the non-constant modulus channel information matrix and removing amplitude information, and obtaining a precoding matrix according to a constant modulus channel information matrix; and precoding data to be sent by using the precoding matrix. | 06-28-2012 |
20120189075 | METHOD AND APPARATUS FOR OBTAINING PRECODING MATRIX INDICATOR - The present disclosure discloses a method and an apparatus for obtaining a precoding matrix indicator, and relates to the field of communication technologies. The method includes: obtaining a first rotation matrix according to first channel information; obtaining a first differential matrix according to the first rotation matrix and a currently-obtained instantaneous beam forming matrix/precoding matrix; and quantizing, according to a first differential codebook, a pre-acquired first rank indicator, and preset quantization criteria, the first differential matrix to obtain a differential precoding matrix indicator. The apparatus includes: a first rotation matrix obtaining module, a first differential matrix obtaining module, and a differential precoding matrix indicator obtaining module. In the present disclosure, the differential PMI is obtained according to the channel information, and the differential PMI is used for feedback, which not only reduces an overhead, but also improves feedback accuracy. | 07-26-2012 |
20120275500 | METHOD AND APPARATUS FOR ACQUIRING A PRECODING MATRIX INDICATOR AND A PRECODING MATRIX - In the field of communication technologies, a method and an apparatus for acquiring a Precoding Matrix Indicator (PMI) and a Precoding Matrix (PM) are provided. The method includes: acquiring a reference PMI and a differential PMI according to a first non-differential codebook and a first diagonal differential codebook, where codewords included in the first diagonal differential codebook form a diagonal matrix. The apparatus includes a PMI acquiring module. Acquiring a reference PMI and a differential PMI according to a non-differential codebook and a diagonal differential codebook can reduce the feedback overhead or improve the feedback precision; and the fact that codewords included in the diagonal differential codebook form a diagonal matrix can maintain amplitude characteristics (for example, a constant modulus characteristic, and a finite character set constraint characteristic) of elements of the non-differential codebook or facilitate power distribution among antennas. | 11-01-2012 |
20120328039 | METHOD AND SYSTEM FOR PRECODING DATA - The present disclosure relates to channel state feedback in a communication system. The method includes obtaining a reference signal from an access point; deriving a rank indication, a codebook subset selection indication and a precoding matrix index based on the obtained reference signal; sending a first feedback message conveying the rank indication and the codebook subset selection indication, and sending a second feedback message conveying the precoding matrix index, to the access point; and receiving, from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index. | 12-27-2012 |
20130010586 | METHOD AND APPARATUS FOR RESOURCE MAPPING AND CODE DIVISION MULTIPLEXING - The present disclosure discloses a method and an apparatus for resource mapping and code division multiplexing. In the present disclosure, each cell selects a mapping scheme among at least two mapping schemes to implement resource mapping, which effectively reduces interference imposed on reference signal symbols of users at the edge of a cell; vector switching is performed for an orthogonal matrix to obtain multiple different codeword sequences and implement codeword design. | 01-10-2013 |
20130021897 | RETRANSMISSION METHOD AND APPARATUS AND COMMUNICATION SYSTEM - The present invention relates to the field of communications technologies, and discloses a retransmission method and apparatus, and a communication system. The method includes: after sending two channel-coded codewords in initial transmission, receiving a retransmission indication, where the retransmission indication includes an identifier of one channel-coded codeword to be retransmitted; according to a preset phase of each symbol, determining a precoding matrix of each symbol of the one channel-coded codeword to be retransmitted, where a phase relationship of each symbol is fixed; and after coding, by using the precoding matrix, each symbol of the one channel-coded codeword to be retransmitted, transmitting the coded symbol through an antenna. Through the present invention, a guarantee can be provided for retransmission success of a UE. | 01-24-2013 |
20130114392 | METHOD AND APPARATUS FOR RESOURCE MAPPING AND CODE DIVISION MULTIPLEXING - The present disclosure discloses a method and an apparatus for resource mapping and code division multiplexing. In the present disclosure, each cell selects a mapping scheme among at least two mapping schemes to implement resource mapping, which effectively reduces interference imposed on reference signal symbols of users at the edge of a cell; vector switching is performed for an orthogonal matrix to obtain multiple different codeword sequences and implement codeword design, so that a problem that the output power of reference signal symbols is unbalanced can be effectively alleviated. | 05-09-2013 |
20130121437 | METHOD AND APPARATUS FOR ACQUIRING A PRECODING MATRIX INDICATOR AND A PRECODING MATRIX - In the field of communication technologies, a method and an apparatus for acquiring a Precoding Matrix Indicator (PMI) and a Precoding Matrix (PM) are provided. The method includes: acquiring a reference PMI and a differential PMI according to a first non-differential codebook and a first diagonal differential codebook, where codewords included in the first diagonal differential codebook form a diagonal matrix. The apparatus includes a PMI acquiring module. Acquiring a reference PMI and a differential PMI according to a non-differential codebook and a diagonal differential codebook can reduce the feedback overhead or improve the feedback precision; and the fact that codewords included in the diagonal differential codebook form a diagonal matrix can maintain amplitude characteristics (for example, a constant modulus characteristic, and a finite character set constraint characteristic) of elements of the non-differential codebook or facilitate power distribution among antennas. | 05-16-2013 |
20130250886 | METHOD, BASE STATION AND USER EQUIPMENT FOR TRANSMITTING CHANNEL QUALITY INFORMATION - Methods and apparatus are provided for transmitting channel quality information. User equipment receives a control signaling for uplink scheduling. The control signaling for uplink scheduling includes at least one modulation and coding scheme (MCS) field, a channel quality information request field, and a resource block allocation field indicating the number of resource blocks (RBs), N | 09-26-2013 |
20130294538 | METHOD FOR GENERATING CODEBOOK, METHOD AND APPARATUS FOR DATA TRANSMISSION - A method for generating a codebook and a method and an apparatus for data transmission are provided. The method includes: receiving a label of a codeword sent by a User Equipment (UE); selecting the codeword identified by the label from the codebook for eight-antenna; and coding data to be sent by using the codeword. The codebook for eight-antenna includes at least one rank-8 codeword for eight-antenna. The rank-8 codeword for eight-antenna is generated by multiplying an inverse matrix of a rotation matrix for eight-antenna with an eight-dimensional matrix formed by rank-4 codewords for four-antenna; or generated by extending rank-4 codewords for eight-antenna, where the rank-4 codeword for eight-antenna is generated according to codewords for four-antenna. Therefore, the codeword in the codebook for eight-antenna is applicable to scenarios including dual-polarization strong correlation, dual-polarization weak correlation, single-polarization strong correlation, and single-polarization weak correlation, etc. | 11-07-2013 |
20140056282 | INTERFERENCE COORDINATION METHOD, BASE STATION, AND COMMUNICATION SYSTEM - Embodiments of the present invention provide an interference coordination method, a base station, and a communication system. The method includes: acquiring first user channel state information on a first time-frequency resource on which interference coordination is to be performed; acquiring second user channel state information on the first time-frequency resource; pairing a first user and a second user according to the first user channel state information and the second user channel state information to obtain transmit power and a precoding matrix that are corresponding to the second user; and transmitting data to the second user on the first time-frequency resource according to the transmit power and the precoding matrix, but not transmitting data to the first user on the first time-frequency resource. | 02-27-2014 |
20140092874 | METHOD AND APPARATUS FOR RESOURCE MAPPING AND CODE DIVISION MULTIPLEXING - The present disclosure discloses a method and an apparatus for resource mapping and code division multiplexing. In the present disclosure, each cell selects a mapping scheme among at least two mapping schemes to implement resource mapping, which effectively reduces interference imposed on reference signal symbols of users at the edge of a cell; vector switching is performed for an orthogonal matrix to obtain multiple different codeword sequences and implement codeword design, so that a problem that the output power of reference signal symbols is unbalanced can be effectively alleviated. | 04-03-2014 |
20140098770 | METHOD, APPARATUS, AND SYSTEM FOR COMP RETRANSMISSION - The present invention provides a method, an apparatus, and a system for CoMP retransmission. The method includes: sending downlink control signaling to a user equipment UE, so that the UE receives, according to the downlink control signaling, an initially transmitted signal sent by a serving transmission point and a cooperative transmission point by joint processing mode; receiving first NAK information corresponding to the initially transmitted signal and returned by the UE, and sending a retransmitted signal corresponding to the initially transmitted signal to the UE according to the first NAK information, where the initially transmitted signal also corresponds to second NAK information sent by the UE to the cooperative transmission point, where the second NAK information is used to instruct the cooperative transmission point to, when the serving transmission point sends the retransmitted signal to the UE, reduce interference to the UE with scheduling. | 04-10-2014 |
20140119228 | METHOD FOR CONFIGURING REFERENCE SIGNAL, UE, AND ENB - The present invention provides a method for configuring a reference signal, a UE, and an eNB. The method includes: determining, by a UE, a reference signal configuration priority set, and sending information of the reference signal configuration priority set to an eNB; and receiving, by the UE, a reference signal configuration measurement set sent by the eNB, where the reference signal configuration measurement set is configured by the eNB according to the information of the reference signal configuration priority set, and the reference signal configuration measurement set is used for the UE to measure and feed back channel state information. In embodiments of the present invention, a reference signal configuration matched with an optimal actual channel of a UE can be selected when an RRH or a base station is geographically separated, so that the UE can acquire a good channel condition. | 05-01-2014 |
20140119325 | Method, Terminal, and Base Station for Feeding Back Channel Information - Embodiments of the present invention disclose a method, terminal, and base station for feeding back channel information. The method includes determining that channel information between access points needs to be fed back and sending feedback content to a base station on a resource configured by the base station, wherein the feedback content includes at least channel adjustment information between a reference access point and a non-reference access point. The resource configured by the base station includes a dedicated resource used to feed back the channel adjustment information and configured by the base station, or all or a part of resources used for periodic feedback and configured by the base station, or all or a part of resources used for aperiodic feedback and configured by the base station. | 05-01-2014 |
20140133595 | METHOD AND SYSTEM FOR PRECODING DATA - The present disclosure relates to channel state feedback in a communication system. The method includes obtaining a reference signal from an access point; deriving a rank indication, a codebook subset selection indication and a precoding matrix index based on the obtained reference signal; sending a first feedback message conveying the rank indication and the codebook subset selection indication, and sending a second feedback message conveying the precoding matrix index, to the access point; and receiving, from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index. | 05-15-2014 |
20140146778 | MULTI-ANTENNA TRANSMISSION METHOD AND APPARATUS - The present invention relates to the field of communications technologies and provides a multi-antenna transmission method and apparatus, which can reduce interference and improve system throughput. In the solutions provided in embodiments of the present invention, a reference signal RS configuration set sent by an eNB is received, CSI corresponding to each RS configuration in the RS configuration set is acquired based on the RS configuration set, the CSI set is sent to the eNB, then a signal sent by the eNB according to the CSI set is received, and data processing is performed. The solutions provided in the embodiments of the present invention apply to multi-antenna signal transmission. | 05-29-2014 |
20140169494 | METHOD FOR GENERATING CODEBOOK, METHOD AND APPARATUS FOR DATA TRANSMISSION - A method for generating a codebook and a method and an apparatus for data transmission are provided. The method includes: receiving a label of a codeword sent by a User Equipment (UE); selecting the codeword identified by the label from the codebook for eight-antenna; and coding data to be sent by using the codeword. The codebook for eight-antenna includes at least one rank-8 codeword for eight-antenna. The rank-8 codeword for eight-antenna is generated by multiplying an inverse matrix of a rotation matrix for eight-antenna with an eight-dimensional matrix formed by rank-4 codewords for four-antenna; or generated by extending rank-4 codewords for eight-antenna, where the rank-4 codeword for eight-antenna is generated according to codewords for four-antenna. Therefore, the codeword in the codebook for eight-antenna is applicable to scenarios including dual-polarization strong correlation, dual-polarization weak correlation, single-polarization strong correlation, and single-polarization weak correlation, etc. | 06-19-2014 |
20140192744 | METHOD AND APPARATUS FOR COORDINATED MULTI-NODE TRANSMISSION - Embodiments of the present invention provide a method and an apparatus for coordinated multi-node transmission The method includes: acquiring, by a user equipment, channel state indicator information of each coordinating node; feeding back, by the user equipment, all information or a part of information in the acquired channel state indicator information to a base station, so that each coordinating node performs, according to the channel state indicator information that has been fed back, scheduling on the user equipment and/or one or more other user equipments served by each coordinating node; and if the user equipment is scheduled, receiving, by the user equipment, scheduling result notification information sent by the base station, and receiving, by the user equipment according to the scheduling result notification information, data transmitted by a base station that corresponds to a coordinating node serving the user equipment. The present invention is applicable to a radio communications system. | 07-10-2014 |
20140211723 | INTERFERENCE MEASUREMENT INDICATION METHOD, INTERFERENCE MEASUREMENT METHOD, RELATED DEVICE, AND COMMUNICATION SYSTEM - Embodiments of the present invention disclose an interference measurement indication method, an interference measurement method, a related device, and a communication system. The interference measurement indication method includes: transmitting, by a base station, at least one piece of first-type channel state information reference signal CSI-RS configuration signaling to a user equipment UE, where the at least one piece of first-type CSI-RS configuration signaling indicates a first resource set used for CSI-RS transmission; and transmitting, by the base station, at least one piece of second-type CSI-RS configuration signaling to the UE, where a second resource set used for CSI-RS transmission, which is indicated by the at least one piece of second-type CSI-RS configuration signaling, is a subset of the first resource set. Technical solutions provided by the embodiments of the present invention help improve the flexibility of interference measurement of the UE. | 07-31-2014 |
20140219380 | METHOD AND APPARATUS FOR TRANSMITTING PRECODING MARTRIX INDEX AND PERFORMING PRECODING - A method and an apparatus for sending a Precoding Matrix Index (PMI) and performing precoding are provided in the embodiments of the present invention. The method for sending the PMI comprises the following steps: a user equipment acquires the transmission channel capability of carrying the PMI; according to the transmission channel capability of carrying the PMI, the precoding matrices are selected from a locally-stored first codebook set to form a second codebook set; a first precoding matrix is selected from the second codebook set; an index corresponding to the first precoding matrix is sent to a base station over the transmission channel so as to make the base station can find out the first precoding matrix according to the index and precode the data according to the first precoding matrix. The embodiments of the present invention can realize the flexible configuration and use of the PMI. | 08-07-2014 |
20140241193 | METHOD AND SYSTEM FOR MEASURING A CHANNEL QUALITY INDICATOR, USER EQUIPMENT AND BASE STATION - Embodiments of the present invention provide a method and a system for measuring a channel quality indicator, a user equipment and a base station. The method includes: obtaining a channel quality indicator configuration, where the channel quality indicator configuration includes a first combination, and the first combination includes a valid signal processing manner and an interfering signal processing manner; performing valid signal processing and interfering signal processing according to the valid signal processing manner and the interfering signal processing manner in the first combination to obtain a valid signal and an interfering signal; performing channel quality indicator calculation according to the valid signal and the interfering signal to obtain a channel quality indicator; and feeding the channel quality indicator back to a base station. | 08-28-2014 |
20140241194 | METHOD AND DEVICE FOR MEASURING CHANNEL QUALITY - A method and a device for measuring channel quality are provided. The method includes: receiving first signal characteristic information and second signal characteristic information sent by a network side, where the first signal characteristic information is used to indicate a first signal, and the second signal characteristic information is used to indicate a second signal; receiving a downlink signal sent by each node in multiple nodes, obtaining a downlink channel response and downlink interference of each node respectively according to the first signal and the second signal in the downlink signal sent by each node; obtaining downlink channel quality information of each node according to the downlink channel response and the downlink interference of each node; and reporting the downlink channel quality information of each node to the network side. According to embodiments of the present invention, overheads for the node to send signaling is greatly lowered. | 08-28-2014 |
20140241198 | METHOD FOR MEASURING AND FEEDING BACK RADIO RESOURCE MANAGEMENT INFORMATION, BASE STATION, AND USER EQUIPMENT - The present application discloses a method for measuring and feeding back radio resource management information, a base station, and a user equipment, relates to the field of communications. The method includes: receiving, by a user equipment UE, a measurement indication from a base station, where the measurement indication includes: information used for indicating, to the UE, at least one channel-state information-reference signal CSI-RS resource used for measuring a received signal strength indicator RSSI; acquiring, by the UE, at least one RSSI according to the measurement indication; acquiring, by the UE, at least one reference signal received quality RSRQ according to the at least one RSSI, where the at least one RSRQ is one-to-one corresponding to the at least one RSSI; and feeding back, by the UE, the at least one RSRQ to the base station. | 08-28-2014 |
20140334571 | METHOD AND APPARATUS FOR ACQUIRING A PRECODING MATRIX INDICATOR AND A PRECODING MATRIX - In the field of communication technologies, a method and an apparatus for acquiring a Precoding Matrix Indicator (PMI) and a Precoding Matrix (PM) are provided. The method includes: acquiring a reference PMI and a differential PMI according to a first non-differential codebook and a first diagonal differential codebook, where codewords included in the first diagonal differential codebook form a diagonal matrix. The apparatus includes a PMI acquiring module. Acquiring a reference PMI and a differential PMI according to a non-differential codebook and a diagonal differential codebook can reduce the feedback overhead or improve the feedback precision; and the fact that codewords included in the diagonal differential codebook form a diagonal matrix can maintain amplitude characteristics (for example, a constant modulus characteristic, and a finite character set constraint characteristic) of elements of the non-differential codebook or facilitate power distribution among antennas. | 11-13-2014 |
20140355548 | DATA TRANSMISSION METHOD, USER EQUIPMENT, AND BASE STATION - Embodiments of the present invention provide a data transmission method, a user equipment, and a base station. The method includes: obtaining a resource element RE configuration, where an RE indicated by the RE configuration is a subset of the RE available for sending a channel state information reference signal CSI-RS and is the RE onto which a data symbol can be mapped; and receiving, according to the RE configuration, the data symbol that is sent by a base station on the RE indicated by the RE configuration. In the embodiments of the present invention, a data symbol can be mapped onto the RE that is used for sending the CSI-RS, so that a UE can receive the data symbol on the RE that is used for sending the CSI-RS, thereby improving the utilization efficiency of the RE. | 12-04-2014 |
20150023289 | DATA TRANSMISSION METHOD AND SYSTEM, BASE STATION AND USER EQUIPMENT - Embodiments of the present invention provide a data transmission method and system, a base station, and a user equipment (UE). The method includes: obtaining, by a base station, a second number of physical resource blocks (PRBs) according to a first number of PRBs, where the second number of PRBs is smaller than the first number of PRBs, and the first number of PRBs is exactly divisible by the second number of PRBs; sending, by the base station, indication information to a UE, where the indication information is used to indicate the second number of PRBs or an encoded bit repetition multiple, and the encoded bit repetition multiple is equal to the first number of PRBs divided by the second number of PRBs; and obtaining, by the UE, the encoded bit repetition multiple according to the indication information, and performing data transmission according to the encoded bit repetition multiple. | 01-22-2015 |
20150029913 | SIGNAL TRANSMISSION METHOD AND APPARATUS - A signal transmission method and apparatus are provided. The method includes generating a first signal according to at least one protocol layer of a first protocol stack and a second protocol stack, and sending the first signal to a receive end by using a first uplink carrier; and/or receiving, by using a first downlink carrier, a third signal sent by receive end, and parsing the third signal according to the at least one protocol layer of the first protocol stack and the second protocol stack; where the first protocol stack is used to implement communication between a base station and a user equipment on a base station side, the second protocol stack is used to implement communication between devices, and the second protocol stack is connected to the at least one protocol layer of the first protocol stack. Therefore, signal transmission can be implemented by using uplink and downlink carriers. | 01-29-2015 |
20150049831 | PRECODING PROCESSING METHOD AND USER EQUIPMENT - A precoding processing method and user equipment are disclosed. The precoding processing method includes: selecting a codebook vector for performing precoding processing for data among a codebook set of N | 02-19-2015 |
20150071253 | Method, Codebook and Base Station for Precoding - A method, a codebook, and a Base Station (BS) for precoding are provided. The precoding method includes: obtaining a total uplink power of a User Equipment (UE); if the total uplink power is greater than ¾ of a rated total transmit power of antennas, selecting a codeword from a first codebook with imbalanced power between layers; otherwise, selecting a codeword from the first codebook and a second codebook with balanced power between layers, so as for precoding data to be transmitted according to the selected codeword. | 03-12-2015 |
20150078474 | METHOD AND SYSTEM FOR PRECODING DATA - The present disclosure relates to channel state feedback in a communication system. The method includes obtaining a reference signal from an access point; deriving a rank indication, a codebook subset selection indication and a precoding matrix index based on the obtained reference signal; sending a first feedback message conveying the rank indication and the codebook subset selection indication, and sending a second feedback message conveying the precoding matrix index, to the access point; and receiving, from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index. | 03-19-2015 |
20150085955 | METHOD AND APPARATUS FOR TRANSMITTING PRECODING MARTRIX INDEX AND PREFORMING PRECODING - A method and an apparatus for sending a Precoding Matrix Index (PMI) and performing precoding are provided in the embodiments of the present invention. The method for sending the PMI comprises the following steps: a user equipment acquires the transmission channel capability of carrying the PMI; according to the transmission channel capability of carrying the PMI, the precoding matrices are selected from a locally-stored first codebook set to form a second codebook set; a first precoding matrix is selected from the second codebook set; an index corresponding to the first precoding matrix is sent to a base station over the transmission channel so as to make the base station can find out the first precoding matrix according to the index and precode the data according to the first precoding matrix. The embodiments of the present invention can realize the flexible configuration and use of the PMI. | 03-26-2015 |