WO2013091526A1 - 一种反馈信道状态信息的方法及装置 - Google Patents
一种反馈信道状态信息的方法及装置 Download PDFInfo
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- WO2013091526A1 WO2013091526A1 PCT/CN2012/086835 CN2012086835W WO2013091526A1 WO 2013091526 A1 WO2013091526 A1 WO 2013091526A1 CN 2012086835 W CN2012086835 W CN 2012086835W WO 2013091526 A1 WO2013091526 A1 WO 2013091526A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
Definitions
- the present invention relates to the field of communication network technologies, and in particular, to a method and apparatus for feeding back channel state information. Background technique
- MIMO Multiple Input Multiple Output
- FDD Frequency Division Duplexing
- the channel state information is usually fed back from the receiving end to the transmitting end. Therefore, the method used to feed back the channel state information is a hot spot in the standard design.
- the channel feature vector is first quantized by weighting a plurality of DFT (Discrete Fourier Transform) codebooks, and then the first level codeword is fed back with a longer period.
- the primary codeword includes a channel statistical center angle, an offset value relative to the central angle, and a number of DFT vectors included in the first level codeword, wherein the horizontally placed UL A (Uniform Linear Array)
- the DFT codeword is usually determined by the horizontal pointing angle, and the horizontal directivity angles corresponding to the plurality of DFT codewords are continuous, so the available codeword number and the codeword offset value represent the DFT vector.
- the second level codeword is fed back in a shorter cycle, and the codeword can be selected from a GLP (Grassmannian Linear Packing) or RVQ (Random Vector Quantization) codebook.
- the ULA DFT codeword only involves horizontally one dimension, and only uses a single layer codeword technique.
- the antenna array is multi-dimensional and the codeword vector is in multiple dimensions, The prior art does not apply. Summary of the invention
- Embodiments of the present invention provide a method and apparatus for feeding back channel state information, which can feed back channel state information under multi-layer data transmission based on a synthesized codebook in a multi-dimensional antenna array, and reduce the amount of feedback bits.
- a method for feeding back channel state information includes:
- each base vector of the first base vector group is a Kronecker product of a base vector corresponding to at least two of a horizontal direction, a vertical direction, and a polarization direction;
- An apparatus for feeding back channel state information includes:
- a second orthogonal basis vector group determining unit configured to determine a group number of the second orthogonal basis vector group and the second orthogonal basis vector group according to the predefined first base vector group, the first base vector group
- Each of the base vectors is a Kronecker product of a base vector corresponding to at least two of the horizontal direction, the vertical direction, and the polarization direction;
- a third base vector group determining unit configured to determine, according to the second orthogonal basis vector group, a third base vector group corresponding to each data layer, where at least one group of the third base vector group corresponding to each data layer The number of vectors of the third basis vector group is greater than 1;
- a calculating unit configured to calculate, according to the third base vector group corresponding to each of the data layers, a second codeword of each data layer;
- a sending unit configured to send a group number of the second orthogonal basis vector group, a third base vector group corresponding to each data layer, and a second level codeword corresponding to each data layer to a base station, so as to The base station can synthesize a plurality of codewords.
- An embodiment of the present invention provides a method and apparatus for feeding back channel state information, by determining a group number of a second orthogonal basis vector group and the second orthogonal basis vector group according to a predefined first base vector group, according to the Determining a second orthogonal basis vector group, determining a third basis vector group corresponding to each data layer, and separately calculating a second level codeword of each data layer, and grouping the group number of the second orthogonal basis vector group
- the third orthogonal basis vector group corresponding to the data layer and the second level codeword corresponding to the respective data layers are sent to the base station, so that the base station can synthesize the multi-layer codeword.
- the ULA DFT codeword only involves horizontally one dimension, and only uses a single layer codeword technique.
- the antenna array is multi-dimensional and the codeword vector is in multiple dimensions, The technique provided is not applicable.
- the channel state information can be fed back under the multi-layer data transmission of the synthesized codebook in the multi-dimensional antenna array, and the feedback bit amount is reduced.
- FIG. 1 is a flowchart of a method for feeding back channel state information according to Embodiment 1 of the present invention
- FIG. 2 is a block diagram of an apparatus for feeding back channel state information according to Embodiment 1 of the present invention
- FIG. 3 is a flowchart of a method for feeding back channel state information according to Embodiment 2 of the present invention.
- FIG. 4 is a schematic diagram of multiple multi-dimensional antenna arrays according to Embodiment 2 of the present invention.
- FIG. 5 is a block diagram of an apparatus for feeding back channel state information according to Embodiment 2 of the present invention.
- FIG. 6 is a block diagram of a second orthogonal basis vector group determining unit according to Embodiment 2 of the present invention. detailed description
- An embodiment of the present invention provides a method for feeding back channel state information.
- the method includes: Step 101: Determine, according to a predefined first base vector group, a second orthogonal basis vector group and the second positive a group number of the base vector group, each of the base vectors of the first base vector group being a Kronecker product of a base vector corresponding to at least two of a horizontal direction, a vertical direction, and a polarization direction;
- Step 102 Determine, according to the second orthogonal basis vector group, a third base vector group corresponding to each data layer of the third base vector group corresponding to each data layer, and at least one set of the third base vector group
- the number of vectors is greater than 1; specifically, determining the number of base vectors K (i) of the third basis vector group corresponding to the i-th data layer;
- a codeword corresponding to the correlation coefficient of the first K (i) of the descending order is a third base vector group corresponding to the i-th data layer;
- the third base vector groups corresponding to the respective data layers are orthogonal to each other and intersect with each other to be empty.
- Step 103 Calculate, according to the third base vector group corresponding to each data layer, a second-level codeword of each data layer;
- the second level codeword corresponding to each data layer is calculated.
- Step 104 Send a group number of the second orthogonal basis vector group, a third base vector group corresponding to each data layer, and the second level code of each data layer to a base station, so that the base station can synthesize multiple Layer code word.
- the first feedback message is sent to the base station, where the first feedback message includes a group number of the second orthogonal basis vector group and a third orthogonal basis vector group corresponding to the respective data layers;
- the first feedback message and the second feedback message are sent to the base station in at least one transmission manner; or the first feedback message and the second feedback message are simultaneously sent to the base station.
- An embodiment of the present invention provides a method for feeding back channel state information, by determining a group number of a second orthogonal basis vector group and the second orthogonal basis vector group according to a predefined first base vector group, according to the foregoing a second orthogonal basis vector group, determining a third base vector group corresponding to each data layer, and separately calculating a second level codeword of each data layer, a group number of the second orthogonal basis vector group, and each of the data layers A corresponding third base vector group and the respective data layer second level codes are transmitted to the base station, so that the base station can synthesize a plurality of codewords.
- the ULA DFT codeword only involves horizontally one dimension, and only uses a single layer codeword technique.
- the antenna array is multi-dimensional and the codeword vector is in multiple dimensions, The technique provided is not applicable.
- the channel state information can be fed back under the multi-layer data transmission of the synthesized codebook in the multi-dimensional antenna array, and the feedback bit amount is reduced.
- An embodiment of the present invention provides an apparatus for feeding back channel state information.
- the apparatus includes: a second orthogonal basis vector group determining unit 201, a third base vector group determining unit 202, a calculating unit 203, and a sending unit. 204.
- a second orthogonal basis vector group determining unit 201 configured to determine, according to a predefined first base vector group, a group number of the second orthogonal basis vector group and the second orthogonal basis vector group, the first base vector
- Each of the base vectors of the group is a Kronecker product of a base vector corresponding to at least two of the horizontal direction, the vertical direction, and the polarization direction;
- a third orthogonal basis vector group determining unit 202 configured to determine each data according to the second orthogonal basis vector group a third base vector group corresponding to the layer, in the third base vector group corresponding to each data layer, at least one set of the third base vector group has a vector number greater than 1;
- the calculating unit 203 is configured to calculate, according to the third base vector group corresponding to each of the data layers, a second level codeword of each data layer;
- the sending unit 204 is configured to send, to the base station, the group number of the second orthogonal basis vector group, the third base vector group corresponding to each of the data layers, and the second level code of each data layer, so that the base station Multiple layers of code words can be synthesized.
- An embodiment of the present invention provides an apparatus for feeding back channel state information, where a second orthogonal basis vector group determining unit determines a second orthogonal basis vector group and the second orthogonal basis vector according to a predefined first base vector group. a group number of the group, according to the second orthogonal basis vector group, the third base vector group determining unit determines a third base vector group corresponding to each data layer, and the computing unit separately calculates the second level code words of each data layer, and sends The unit sends the group number of the second orthogonal basis vector group, the third orthogonal basis vector group corresponding to each data layer, and the second level code of each data layer to the base station, so that the base station can synthesize more Layer code word.
- the ULA DFT codeword only involves horizontally one dimension, and only uses a single layer codeword technique.
- the antenna array is multi-dimensional and the codeword vector is in multiple dimensions, The technique provided is not applicable.
- the channel state information can be fed back under the multi-layer data transmission of the synthesized codebook in the multi-dimensional antenna array, and the feedback bit amount is reduced.
- An embodiment of the present invention provides a method for feeding back channel state information.
- the method includes: Step 301: Determine, according to a predefined first base vector group, a second orthogonal basis vector group and the second positive a group number of the base vector group, each of the base vectors of the first base vector group being a Kronecker product of a base vector corresponding to at least two of a horizontal direction, a vertical direction, and a polarization direction;
- %e [0, 2 r] is an arbitrary initial phase.
- the order of the Kronecker products of the components constituting the basis vector is not fixed and can be exchanged with each other.
- the multi-dimensional includes a vertical direction dimension, a horizontal direction dimension, and a polarization direction dimension, wherein the definition of the dimension is related to the reference direction.
- Figure 4 (A) The antenna in the vertical direction, the horizontal direction, and the polarization direction are three-dimensional.
- the antenna in Fig. 4(B) is vertical and two-dimensional in the horizontal direction.
- the antenna in Fig. 4(C) is horizontal and the polarization direction is two-dimensional.
- the antenna in Figure 4 (A) is in the vertical direction and the polarization direction is two-dimensional.
- the antenna may be a physical antenna or an equivalent port formed by a plurality of physical antennas.
- Method 1 the method for determining the group number of the second orthogonal basis vector group and the second orthogonal basis vector group is as follows: Method 1:
- the orthogonal basis vector groups of at least two of the horizontal direction, the vertical direction, and the polarization direction are respectively determined according to the predefined first base vector group;
- a set of orthogonal base vector groups in two directions is respectively selected to form an orthogonal basis vector group, and at least one set of orthogonal basis vector groups is obtained.
- a set of multi-dimensional orthogonal basis vector groups can be used. S is marked, and S is a positive integer.
- the multi-dimensional array ⁇ S l, S2, S3 ⁇ can be uniquely associated with a certain base vector group in a predefined manner, where S l , S2 , and S3 respectively correspond to different dimensions, and each dimension thereof The order is not fixed and can be combined arbitrarily.
- any one of the above base vector groups is C2, based on multi-layer transmission, for example, L data layer, and the correlation coefficient of each codeword in C2 and the ith data layer feature vector to be quantized needs to be calculated, i is L
- the maximum correlation coefficient of each data layer in the L data layers is determined according to the above method, and the sum of the maximum correlation coefficients of the respective data layers is calculated, that is, the sum of the maximum correlation coefficients in each data layer in C2 is determined.
- step 1 grouping the predefined first base vector groups to obtain at least one set of orthogonal basis vectors; the method of step 1 is the same as the method of step 1 of method one, as shown in step 1 of mode one.
- K ( i ) refers to the preset code word number
- the correlation coefficient of each codeword and the channel feature vector in C2 is calculated, and then arranged in descending order, and K(i+1) is calculated. The sum of the correlation coefficients.
- Step 302 Determine, according to the second orthogonal basis vector group, a third basis vector group corresponding to each data layer, where at least one group of the third base vector group in the third base vector group corresponding to each data layer The number of vectors is greater than 1;
- the third base vector group corresponding to the i-th data layer needs to be selected ⁇ ).
- determining the third basis vector group corresponding to each data layer includes the following sub-steps:
- it may be obtained by an indication of the base station, or may be obtained by a selection algorithm at the UE end.
- each codeword has a number in C2, specifically from 1 to L, where L is the number of layers of the data layer, and the codewords in the third base vector group can be performed according to the number of codewords in C2.
- K ( i ) numbers can be obtained, and the number ranges from 1 to C2.
- the vectors in the third base vector group corresponding to the respective data layers may have a repetition vector or no repetition vector.
- the vector in the third base vector group corresponding to each data layer may be selected without a repetition vector, so that the feedback amount of the channel state information fed back to the base station is high, and the feedback performance is good.
- the second level codeword is no longer needed to be calculated, and the group number of the second base vector group and the third corresponding to each data layer are directly
- the base vector group is fed back to the base station; when at least one set of vectors in the third base vector group corresponding to each data layer is greater than 1, Calculating the second-level codeword corresponding to each data layer, and feeding back the channel state information to the base station, the group number of the second orthogonal basis vector group, the third base vector group corresponding to the respective data layers, and the The second level codeword corresponding to each data layer is sent to the base station.
- the embodiment of the present invention is described in detail with the number of vectors in the base vector group corresponding to each data layer being greater than 1.
- the third base vector group corresponding to each data layer is a subset of the second base vector group, the intersection of the third base vector groups of the respective data layers is empty and orthogonal to each other, so that the feedback bits can be greatly reduced. the amount.
- Step 303 Calculate, according to the third orthogonal basis vector group corresponding to the i-th data layer, a second-level codeword corresponding to the i-th data layer;
- each base vector in the second base vector group is orthogonal to each other, and the intersection of the third base vector groups of the respective data layers is empty, the multi-layer code words synthesized on the base station side are orthogonal to each other, The amount of feedback bits can be reduced, and the gain brought by the synthesized codebook can be made more apparent.
- Step 305 Send a group number of the second orthogonal basis vector group, a third orthogonal basis vector group corresponding to each data layer, and a second level codeword corresponding to each data layer to a base station, so as to The base station can synthesize a plurality of codewords.
- the third orthogonal basis vector group corresponding to each data layer is sent to the base station, the following two cases are included. First, if the base station specifies the number of vectors of the third base vector group, only each vector needs to be fed back. Number in C2; Second, if the terminal decides the number of vectors for each third base vector group, it is necessary to feed back the number of vectors of each third base vector group and the corresponding vector number in C2.
- the first feedback message is sent to the base station, where the first feedback message includes a group number of the second orthogonal basis vector group and a third orthogonal basis vector group corresponding to the respective data layers;
- the feedback message is sent to the base station.
- the second feedback message includes the second level codewords of the respective data layers.
- the feedback period is different, so the first feedback message and the second feedback message are respectively Sending to the base station, specifically, transmitting the first feedback message to the base station by using at least one sending manner, and transmitting the second feedback message to the base station by using at least one sending manner;
- the first feedback message and the second feedback message are simultaneously sent to the base station, and the first feedback message and the second feedback message are packaged, and the packaged The first feedback message and the second feedback message are sent to the base station.
- the matrix composed of the third base vector group and the second-level codewords that need feedback are related to the number of base vectors in the third base vector group, and are not directly related to the number of antennas, so that the actual channel can be better based on the actual channel.
- the characteristics determine the amount of feedback.
- An embodiment of the present invention provides a method for feeding back channel state information, by determining a group number of a second orthogonal basis vector group and the second orthogonal basis vector group according to a predefined first base vector group, according to the foregoing a second orthogonal basis vector group, determining a third base vector group corresponding to each data layer, and separately calculating a second level codeword of each data layer, a group number of the second orthogonal basis vector group, and each of the data layers A corresponding third base vector group and the respective data layer second level codes are transmitted to the base station, so that the base station can synthesize a plurality of codewords.
- the ULA DFT codeword When using the prior art feedback channel state information, the ULA DFT codeword only involves horizontally one dimension, and only uses a single layer codeword technique.
- the antenna array is multi-dimensional and the codeword vector is in multiple dimensions.
- the solution provided by the embodiment of the present invention can feed back channel state information in a multi-layer data transmission based on a composite codebook in a multi-dimensional antenna array, and reduce the amount of feedback bits, thereby improving the gain of the synthesized codebook. .
- An embodiment of the present invention provides an apparatus for feeding back channel state information.
- the apparatus includes: a second orthogonal basis vector group determining unit 501, a third base vector group determining unit 502, and a base vector quantity determining module 5021.
- a second orthogonal basis vector group determining unit 501 configured to determine, according to a predefined first base vector group, a group number of the second orthogonal basis vector group and the second orthogonal basis vector group, the first base vector
- Each of the base vectors of the group is a Kronecker product of a base vector corresponding to at least two of the horizontal direction, the vertical direction, and the polarization direction;
- the second orthogonal basis vector group determining unit 501 includes a packet obtaining module 5011, a correlation coefficient calculating module 5012, a first determining module 5013, an obtaining module 5014, and a second determining module 5015.
- Module 5016 determining submodule 50111, obtaining submodule 50112;
- the second orthogonal basis vector group determining unit 501 determines the group numbers of the second orthogonal basis vector group and the second orthogonal basis vector group in the following two ways:
- the group obtaining module 5011 in the second orthogonal basis vector group determining unit 501 is configured to group the predefined first base vector groups to obtain at least one set of orthogonal basis vector groups;
- the correlation coefficient calculation module 5012 in the second orthogonal basis vector group determining unit 501 is configured to traverse each codeword in any one of the orthogonal base vector groups, and calculate each of the code words and to be respectively Quantifying the correlation coefficient of each data layer channel feature vector;
- the first determining module 5013 in the second orthogonal basis vector group determining unit 501 determines the largest correlation coefficient among the correlation coefficients of each data layer channel feature vector according to the calculated correlation coefficient;
- the obtaining module 5014 in the second orthogonal basis vector group determining unit 501 is configured to calculate a sum of the maximum correlation coefficients to obtain a sum of first correlation coefficients;
- the second determining module 5015 in the second orthogonal basis vector group determining unit 501 determines that the largest group of the first correlation coefficients is the second group. And a set of orthogonal basis vectors, and determining a group number of the second orthogonal basis vector group.
- the group obtaining module 5011 is configured to group the predefined first base vector groups to obtain at least one set of orthogonal basis vector groups;
- the correlation coefficient calculation module 5012 is further configured to: traverse each codeword in any one of the orthogonal base vector groups, and respectively calculate a correlation between each of the codewords and a channel feature vector of an ith data layer to be quantized; a coefficient, and the calculated correlation coefficients of the ith data layer channel eigenvectors are arranged in descending order, where i is a positive integer, the i-th data layer Is any data layer in the transmission channel;
- the calculating module 5016 in the second orthogonal basis vector group determining unit 501 is configured to calculate a sum of the first K (i) correlation coefficients in the correlation coefficient in descending order according to the preset number of code words, where K ( i) refers to the preset number of code words; according to the method for calculating the sum of the correlation coefficients, respectively calculating the correlation coefficient of each of the code words and the channel feature vector of each data layer to be quantized, and calculating and presetting the code in descending order
- the number of words corresponds to the sum of the correlation coefficients of the number;
- the obtaining module 5014 is configured to calculate a sum of correlation coefficients of channel feature vectors of all data layers to be quantized, and obtain a sum of the second correlation coefficients;
- the second determining module 5015 is configured to determine, according to a sum of the second correlation coefficients of all the groups, a group in which the sum of the second correlation coefficients is a second orthogonal basis vector group, and determine the The group number of the second orthogonal basis vector group.
- the determining submodule 50111 in the group obtaining module 5011 is configured to respectively determine orthogonal base vector groups of at least two of the horizontal direction, the vertical direction, and the polarization direction according to the predefined first base vector group.
- the obtaining sub-module 50112 in the group obtaining module 5011 respectively selects one set from the orthogonal base vector groups in the at least two directions to form an orthogonal base vector group, and obtains at least one set of orthogonal basis vectors. group.
- the third orthogonal basis vector group determining unit 502 is configured to determine, according to the second orthogonal basis vector group, a third basis vector group corresponding to each data layer, where each In the third base vector group corresponding to the data layer, the number of vectors of at least one of the third base vector groups is greater than 1;
- the base vector quantity determining module 5021 in the third orthogonal basis vector group determining unit 502 is configured to determine the number of base vectors K (1) of the third base vector group corresponding to the i-th data layer;
- the calculating module 5022 is configured to calculate correlation coefficients of the respective codewords and the i-th channel feature vector according to the codewords in the second orthogonal basis vector group, and arrange the correlation coefficients in descending order;
- the third base vector group determining module 5023 determines that the codeword corresponding to the first K (i) of the descending order correlations is the third base vector group corresponding to the i-th data layer.
- a calculating unit 503 Calculating, according to the third base vector group corresponding to each data layer, a calculating unit 503, respectively calculating a second level codeword of each data layer; the calculating unit 503 is specifically configured to: according to the orthogonal basis vector group corresponding to the ith data layer Calculating a second-level codeword corresponding to the ith data layer; calculating a second-level codeword corresponding to each data layer according to the method for calculating the second-level codeword;
- the calculating unit 503 calculates the corresponding portion of the ith data layer a second codeword x (i ) , where v e (i) is a channel feature vector of the ith data layer, and G (i ) is a matrix of all vectors in the third base vector group corresponding to the ith data layer.
- the sending unit 504 is configured to send, to the base station, a group number of the second orthogonal basis vector group, a third base vector group corresponding to each of the data layers, and a second level codeword corresponding to each of the data layers, so that The base station can synthesize a plurality of codewords.
- the sending unit 504 is further configured to: use the second orthogonal basis vector group
- the group number and the third base vector group corresponding to the respective data layers are sent to the base station, so that the base station can synthesize the multi-layer codeword.
- the sending unit 504 is specifically configured to: send a first feedback message to the base station, where the first feedback message includes a group number of the second orthogonal basis vector group and a third base vector group corresponding to each of the data layers Sending a second feedback message to the base station, where the second feedback message includes a second level codeword corresponding to each of the data layers;
- the first feedback message and the second feedback message are sent to the base station in at least one transmission manner; or the first feedback message and the second feedback message are simultaneously sent to the base station.
- the third base vector groups corresponding to the respective data layers are orthogonal to each other and intersect with each other to be empty.
- An apparatus for feeding back channel state information according to an embodiment of the present invention, where a second orthogonal basis vector group determining unit and a third orthogonal basis vector group respectively determine a second orthogonal basis vector group and a third corresponding to each data layer
- the orthogonal basis vector group, the recalculating unit respectively calculates the second level codewords of the respective data layers
- the sending unit sets the group number of the second orthogonal basis vector group and the third orthogonal basis vector group corresponding to the respective data layers
- the respective data layer second level codes are sent to the base station, so that the base station can synthesize the multi-layer codewords.
- the ULA DFT codeword only involves horizontally one dimension, and only uses a single layer codeword technique.
- the antenna array is multi-dimensional and the codeword vector is in multiple dimensions, The technique provided is not applicable.
- the channel state information can be fed back under the multi-layer data transmission of the synthesized codebook in the multi-dimensional antenna array, and the feedback bit amount is reduced.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12858736.7A EP2824847B1 (en) | 2011-12-23 | 2012-12-18 | Channel status information feedback method and device |
JP2014547695A JP5878646B2 (ja) | 2011-12-23 | 2012-12-18 | チャネル状態情報をフィードバックするための方法及び装置 |
US14/310,905 US9455856B2 (en) | 2011-12-23 | 2014-06-20 | Method and apparatus for feeding back channel state information |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN201110439303.XA CN103178888B (zh) | 2011-12-23 | 2011-12-23 | 一种反馈信道状态信息的方法及装置 |
CN201110439303.X | 2011-12-23 |
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CN109478955A (zh) * | 2016-08-11 | 2019-03-15 | 华为技术有限公司 | 一种反馈参数上报方法和装置 |
CN107888323B (zh) * | 2016-09-29 | 2020-01-17 | 电信科学技术研究院 | 一种信道状态信息的传输方法和设备 |
CN108023617B (zh) * | 2016-11-04 | 2023-06-27 | 华为技术有限公司 | 信道状态信息csi的反馈方法、接收方法、用户设备和网络设备 |
CN106685589B (zh) * | 2016-11-30 | 2019-12-17 | 上海华为技术有限公司 | 一种反馈信号状态的方法,基站以及终端 |
CN108288983B (zh) * | 2017-01-09 | 2022-01-28 | 中兴通讯股份有限公司 | 信道状态信息的反馈、确定方法及装置 |
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US9455856B2 (en) | 2016-09-27 |
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