WO2016169213A1 - Procédé et dispositif d'acquisition d'informations de canal - Google Patents

Procédé et dispositif d'acquisition d'informations de canal Download PDF

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WO2016169213A1
WO2016169213A1 PCT/CN2015/090797 CN2015090797W WO2016169213A1 WO 2016169213 A1 WO2016169213 A1 WO 2016169213A1 CN 2015090797 W CN2015090797 W CN 2015090797W WO 2016169213 A1 WO2016169213 A1 WO 2016169213A1
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Prior art keywords
matrix
information
channel
terminal
base station
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PCT/CN2015/090797
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English (en)
Chinese (zh)
Inventor
肖华华
陈艺戬
李儒岳
鲁照华
李剑
徐俊
赵晶
唐红
王瑜新
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中兴通讯股份有限公司
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Publication of WO2016169213A1 publication Critical patent/WO2016169213A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals

Definitions

  • the embodiments of the present invention relate to, but are not limited to, the field of communications, and in particular, to a method and an apparatus for acquiring channel information.
  • a transmitting end and a receiving end use a plurality of antennas to obtain a higher rate in a spatial multiplexing manner.
  • an enhanced technology is that the receiving end feeds back the channel information of the transmitting end, and the transmitting end uses the transmitting precoding technology according to the obtained channel information, which can greatly improve the transmission performance.
  • SU-MIMO single-user multiple-input multiple-output
  • MIMO Multi-input Multi-output, multiple-input multiple-output
  • MU-MIMO multi-user MIMO
  • the feedback of channel information is mainly a feedback method using a simple single codebook, and the performance of MIMO transmit precoding technology is more dependent on the codebook feedback. Accuracy.
  • the eigenvector space of the channel matrix is quantized to form the codebook space
  • the transmitting end and the receiving end jointly save or generate the codebook in real time. (The transmitter and receiver are the same).
  • the receiving end is from the codebook space according to certain criteria. Select a codeword that best matches the channel implementation H And the code word
  • the serial number i (codeword serial number) is fed back to the transmitting end.
  • the codeword sequence number is referred to as a Precoding Matrix Indicator (PMI) in the codebook.
  • the transmitting end finds the corresponding precoding codeword according to the serial number i Thereby obtaining corresponding channel information, The feature vector information of the channel is indicated.
  • PMI Precoding Matrix Indicator
  • General code space It may also be divided into multiple codebooks corresponding to Ranks, and each Rank corresponds to a plurality of codewords to quantize the precoding matrix formed by the channel feature vectors under the Rank. Since the number of Rank and non-zero feature vectors of the channel are equal, in general, when the Rank is N, the codeword will have N columns. Therefore, the codebook space It can be divided into multiple subcodebooks according to the difference of Rank, as shown in Table 1.
  • the codebook is divided into multiple subcodes according to Rank.
  • the codewords to be stored when Rank>1 are in the form of a matrix, wherein the codebook in the LTE protocol is the feedback method of the codebook quantization used.
  • the precoding codebook and the channel information quantization codebook in LTE are used. The meaning is the same.
  • the vector can also be viewed as a matrix of dimension 1.
  • MIMO enhancement technology 3D beam Beamforming (BF) and MIMO of larger antennas can be defined as FD-MIMO technology.
  • FD-MIMO not only supports traditional horizontal beamforming, but also supports vertical beamforming
  • the antenna topology is changed from a traditional linear one-dimensional topology to a two-dimensional planar array.
  • the number of antennas is also greatly increased, so Feedback technology puts forward higher requirements
  • the change of the antenna topology will make the codebook need to be suitable for multiple antenna topologies, and the design will become more complicated.
  • the number of antennas will increase greatly, and the precoding dimension will increase rapidly.
  • the feedback overhead is very large, and the complexity of terminal side codeword selection is high.
  • An effective method in the related art is to use a dimensionality reduction technique to reduce the feedback dimension, thereby reducing overhead and complexity.
  • the basic principle of this method is as follows:
  • the all-dimensional channel is a matrix of Nr ⁇ Nt, and Nr is the number of receiving antennas.
  • Nt is relatively large
  • the channel matrix dimension is relatively large.
  • W1 is a matrix of Nt ⁇ M dimensions
  • W2 is a matrix of M ⁇ r, where r is the number of transmission layers, in general, transmission
  • the number of layers is less than or equal to the number of receiving antennas Nr.
  • M is an integer less than Nt.
  • the W1 information is understood to be a channel that does not change for a long time and is applicable to the portion of the channel information of the entire bandwidth.
  • W2 information is understood to be a channel that changes rapidly and may have different channel information between any subbands.
  • channel H can be reduced in dimension.
  • One method is:
  • Method A The base station transmits a full-dimensional CSI-RS (Channel State Information Reference Signal) pilot, and the full-dimensional CSI-RS pilot means that the terminal can obtain a full-dimensional channel matrix H based on its measurement.
  • CSI-RS Channel State Information Reference Signal
  • W1 and W2 can be separately quantized according to H, which only requires long-term broadband feedback, and the W2 requires feedback of short-period sub-bands.
  • the acquisition of the W1 matrix has many seed methods, one of which is:
  • W 1 is an Nt ⁇ M matrix
  • each column of W 1 can be understood as a basic vector reflecting multipath direction and polarization information, which is obtained by Kronecker product from three DFT vectors.
  • the obtaining method may be: decomposing the channel H, decomposing into a plurality of the multipath weighted combinations, and selecting an effective multipath according to the weight magnitude information. Determining M column vectors in W1 according to the selected plurality of multipaths
  • W 1 is an Nt ⁇ M matrix It is the first M feature vectors of the channel statistics autocorrelation matrix R.
  • the channel R is obtained by statistically averaging the autocorrelation matrices of the channels on multiple subcarriers and multiple sub-frames, and R reflects the long-term statistical information of some channels.
  • the above W1 can be calculated by the terminal and fed back to the base station through the uplink channel as feedback information of the long period, or can be configured by the base station to the terminal.
  • the terminal obtains a dimensionality reduction matrix H ⁇ W1 according to the measured H and the determined W1.
  • the feedback of W2 can be performed using a 4-antenna or 8-antenna codebook.
  • Method B The basic principle is similar to Method A, but the base station does not transmit the full-scale CSI-RS pilot, but uses the FDD uplink and downlink channel statistics autocorrelation matrix R reciprocity, or some other measurement means to obtain and determine the W1 matrix, Then, W1 is used for virtualization of the antenna to the CSI-RS port, such that the Nt root antenna is virtualized into M CSI-RS ports through the W1 matrix. The terminal performs measurement and CSI feedback based on the M CSI-RS ports.
  • This method has similar performance to method A, except that the pilot overhead of this method is smaller, and the W1 matrix mainly depends on the base station.
  • the dimensionality reduction feedback technique in the related art has a good performance in theory, and since the antenna topology only affects W1, the feedback design of W2 can also adopt a relatively general design, but the disadvantage is that
  • the 4 antennas and 8 antennas of the protocol are constant modulus codebooks. Each weight in the precoding matrix is the same modulus value, which results in poor performance and cannot fully exploit the advantages of the dimensionality reduction feedback technique.
  • the embodiment of the invention provides a channel information acquisition method and device, which can solve the technical defect that the performance of the constant modulus codebook is poor when the dimensionality reduction feedback is used in the related art.
  • the embodiment of the invention provides a method for acquiring channel information, including:
  • the terminal obtains the measured channel Hp between the M ports of the base station and the terminal;
  • the terminal acquires weight magnitude information D, and the codeword matrix w is used in combination with the weight magnitude information D to jointly represent the quantization information of the channel Hp;
  • the terminal feeds back indication information and r information of the codeword matrix to the base station.
  • the weight magnitude information D is amplitude adjustment information of an element in the codeword matrix w.
  • codeword matrix w is a constant modulus codeword.
  • the weight magnitude information D information is one or more diagonal matrices.
  • the diagonal matrix diagonal elements have at least 2 different amplitudes.
  • the diagonal matrix diagonal element has at least one element that is 0.
  • the terminal obtains the same number of weight magnitude information D as the number of r, including D1, D2, ..., Dr, the D1, D2, ..., Dr information and r of w respectively
  • the weight magnitude information D is configured by the base station by using a downlink control channel.
  • the weight magnitude information D is determined by the terminal according to the channel measurement pilot, and the weight amplitude information D is fed back by the terminal to the base station.
  • the weight magnitude information is a singular value of the channel matrix Hp or a channel autocorrelation matrix Characteristic value.
  • the method further includes: when the base station sends the channel measurement pilot, performing precoding using the matrix P, and mapping the Nt physical antenna units to the M antenna ports, where the Nt and M are integers, M Less than or equal to Nt, wherein the matrix P is fed back by the terminal or obtained according to the uplink channel measurement result.
  • the method further includes that the base station obtains channel quantization information W of the channel Hf between the Nt physical antenna units and the terminal by using the matrix P, the weight magnitude information D, and the codeword matrix w information.
  • the base station obtains channel quantization information W of the channel Hf between the Nt physical antenna units and the terminal by using the matrix P, the weight magnitude information D, and the codeword matrix w information, including: the base station uses the matrix P, the weight magnitude information D1, D2 ... Dr and the codeword matrix w information obtain channel quantization information W of the channel Hf between the Nt physical antenna elements and the terminal.
  • the channel quantization information W P ⁇ [D1 ⁇ w(:,1)...Dr ⁇ w(:,r)], where ⁇ represents a matrix product operation.
  • the embodiment of the invention further provides a method for acquiring channel information, including:
  • the terminal obtains channel measurement information Hf;
  • the terminal further selects a codeword matrix from the r-codebook agreed by the base station and the terminal according to the measured channel measurement information Hf, to obtain a second matrix w, wherein the weight magnitude information D and the second matrix w together to characterize the quantization matrix or precoding matrix W of the channel Hf;
  • the terminal feeds back at least the indication information of the second matrix w.
  • the weight magnitude information D is amplitude adjustment information of an element in the second matrix w.
  • the second matrix w is a constant modulus codeword.
  • weight magnitude information D is one or more diagonal matrices.
  • the diagonal elements of the diagonal matrix have at least two different amplitudes.
  • the diagonal element of the diagonal matrix has at least one element that is 0.
  • the determining, by the terminal, the weight magnitude information D includes: the base station and the terminal agree to divide the value of the RI into X groups, each group includes different RI values, and the terminal determines according to the RI value r In the RI group, the terminal obtains the weight magnitude information D corresponding to the RI group according to the RI group.
  • the quantization matrix or precoding matrix W P ⁇ D ⁇ w of the channel Hf, where ⁇ represents a matrix product operation.
  • the terminal obtains the same number of D information as the number of r, D1, D2, ..., Dr, and the D1, D2, ..., Dr information is used in combination with the r columns of w, respectively.
  • a quantization matrix or precoding matrix W that collectively characterizes the channel Hf.
  • the quantization matrix or precoding matrix of the channel Hf is W ⁇ P ⁇ [D1 ⁇ w(:,1)...Dr ⁇ w(:,r)].
  • the weight magnitude information D is configured by the base station by using a downlink control channel.
  • the weight magnitude information D is determined by the terminal according to the channel measurement pilot, and the terminal feeds back the weight magnitude information D to the base station.
  • the first matrix P is configured by the base station by using a downlink control channel, and the base station and the terminal agree to divide the value of the RI into Y groups, and the base station allocates a corresponding first matrix P for different RI groups.
  • the first matrix P is fed back by the terminal, and the base station and the terminal agree to divide the value of the RI into Y groups, and the base station and the terminal agree on the first matrix P quantization feedback used by the respective RI group.
  • Codebook 1, codebook 2, ... codebook Y, the codebook 1 ... codebook Y are not identical.
  • the terminal at least feeding back the indication information of the second matrix w, includes:
  • the terminal feeds back the indication information of the second matrix w and the r information to the base station;
  • the terminal feeds back an indication of the first matrix P, the weight magnitude information D, and the second matrix w to the base station. information;
  • the terminal feeds back the weight magnitude information D and the second matrix w to the base station.
  • Indication information
  • the terminal feeds back the weight magnitude information P and the base station to the base station.
  • the indication information of the second matrix w is provided.
  • the embodiment of the present invention further provides a device for acquiring channel information, where the device is disposed at a terminal, and the device includes:
  • a channel acquisition module configured to obtain a measured channel Hp between the M ports of the base station and the terminal;
  • the amplitude acquisition module is set to obtain the weight magnitude information D;
  • the sending module is configured to feed back the indication information and the r information of the codeword matrix to the base station.
  • the weight magnitude information D is amplitude adjustment information of an element in the codeword matrix w.
  • codeword matrix w is a constant modulus codeword.
  • the weight magnitude information D information is one or more diagonal matrices.
  • the diagonal matrix diagonal elements have at least 2 different amplitudes.
  • the diagonal matrix diagonal element has at least one element that is 0.
  • the amplitude obtaining module is configured to obtain the same number of weight magnitude information D as the number of r when r is greater than 1, including D1, D2, ..., Dr, D1, D2, ...
  • the weight magnitude information D is configured by the base station by using a downlink control channel.
  • the sending module is further configured to feed back the weight magnitude information D to the base station.
  • the D information is a singular value of the channel matrix Hp or a channel autocorrelation matrix Characteristic value.
  • An embodiment of the present invention further provides a base station, including
  • a first module configured to perform precoding using a matrix P when transmitting channel measurement pilots, wherein the matrix P is fed back by a terminal or obtained according to an uplink channel measurement result;
  • the second module is configured to map the channel measurement pilot precoded using the matrix P by Nt physical antenna units to M antenna ports, where Nt and M are integers, and M is less than or equal to Nt.
  • the matrix P, the weight magnitude information D, and the codeword matrix w information are used to obtain channel quantization information W of the channel Hf between the Nt physical antenna elements and the terminal.
  • the matrix P, the weight magnitude information D1, D2, ..., Dr, and the codeword matrix w information are used to obtain channel quantization information W of the channel Hf between the Nt physical antenna elements and the terminal.
  • the channel quantization information W P ⁇ [D1 ⁇ w(:,1)...Dr ⁇ w(:,r)], where ⁇ represents a matrix product operation.
  • the embodiment of the invention further provides a device for acquiring channel information, which is disposed on a terminal, and the device includes:
  • a measurement information acquisition module configured to obtain channel measurement information Hf
  • a determining module configured to determine the first matrix P and the weight magnitude information D, wherein the first matrix P, the weight magnitude information D is determined by the terminal according to the configuration of the base station or the channel information Hf measured by the terminal;
  • the codeword matrix obtaining module is configured to: according to the measured channel measurement information, select a codeword matrix from the r-codebook agreed by the base station and the terminal, to obtain a second matrix w, wherein the weight magnitude information D and The second matrix w collectively characterizes the quantization matrix or precoding matrix W of the channel Hf;
  • the feedback module is configured to at least feed back indication information of the second matrix w.
  • the weight magnitude information D is amplitude adjustment information of an element in the second matrix w.
  • the second matrix w is a constant modulus codeword.
  • weight magnitude information D is one or more diagonal matrices.
  • the diagonal elements of the diagonal matrix have at least two different amplitudes.
  • the diagonal element of the diagonal matrix has at least one element that is 0.
  • the determining module determines the weight magnitude information D, the determining module determines, according to the RI value r, the RI group, and obtains the weight magnitude information corresponding to the RI group according to the RI group, where The terminal and the base station agree to divide the value of the RI into X groups, and each group contains different RI values.
  • the quantization matrix or precoding matrix W P ⁇ D ⁇ w of the channel Hf, where ⁇ represents a matrix product operation.
  • the determining module obtains the same number of D information as the number of r, D1, D2, ..., Dr, the D1, D2, ..., Dr information respectively and r columns of w
  • a quantization matrix or precoding matrix W for jointly characterizing the channel Hf is combined.
  • the quantization matrix or precoding matrix of the channel Hf is W ⁇ P ⁇ [D1 ⁇ w(:,1)...Dr ⁇ w(:,r)].
  • the weight magnitude information D is configured by the base station by using a downlink control channel.
  • the feedback module is further configured to feed back the weight magnitude information D to the base station.
  • the first matrix P is configured by a base station by using a downlink control channel, and The station and the terminal agree to divide the value of the RI into Y groups, and the base station allocates a corresponding first matrix P for different RI groups.
  • the feedback module is further configured to feed back the first matrix P, where the base station and the terminal agree to divide the value of the RI into Y groups, and the base station and the terminal agree on respective RI groups.
  • the codebook 1, the codebook 2, the ... codebook Y used for the first matrix P quantization feedback, the codebook 1 ... codebook Y are not identical.
  • the feedback module is configured to:
  • the feedback module feeds back the indication information of the second matrix w and the r information to the base station; when the first matrix P, When the weight magnitude information D is determined by the determining module according to the measured channel measurement information Hf, the feedback module feeds back the indication information of the first matrix P, the weight magnitude information D, and the second matrix w to the base station;
  • the first matrix P is determined by the determining module according to the configuration of the base station, and when the weight magnitude information D is determined by the determining module according to the measured channel measurement information Hf, the feedback module feeds back the weight magnitude information to the base station.
  • Denotation information of the D and the second matrix w when the first matrix P is determined by the determining module according to the measured channel measurement information Hf, when the weight magnitude information D is determined by the determining module according to the base station configuration,
  • the feedback module feeds back the indication information of the weight magnitude information P and the second matrix w to the base station.
  • the embodiment of the invention further provides a computer readable storage medium storing program instructions, which can be implemented when the program instructions are executed.
  • FIG. 1 is a flowchart of a method for acquiring channel information according to an embodiment of the present invention
  • FIG. 2 is a flowchart of another method for acquiring channel information according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of an apparatus for acquiring channel information according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of another apparatus for acquiring channel information according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • a base station includes, but is not limited to, a plurality of wireless communication devices such as a macro base station, a micro base station, and a wireless access point.
  • Terminals include, but are not limited to, data cards, mobile phones, notebook computers, personal computers, tablets, personal digital assistants, Bluetooth and other terminals, as well as relay, remote devices, wireless access points and other wireless communication devices.
  • the channel rank includes but is not limited to: the number of data transmission layers, the number of data transmission streams, the number of data streams, the number of data layers, the channel Rank, RI, rank, and the like.
  • FIG. 1 is a flowchart of a method for acquiring channel information according to an embodiment of the present invention. The method shown in Figure 1 includes:
  • Step 101 The terminal performs channel measurement on the channel measurement pilot (CSI-RS) of the M ports, and obtains the measured channel Hp between the M ports of the base station and the terminal;
  • CSI-RS channel measurement pilot
  • Step 103 The terminal acquires weight magnitude information D.
  • the codeword matrix w is combined with the weight magnitude information D to jointly represent the quantization information of the channel Hp.
  • Step 104 The terminal feeds back indication information and r information of the codeword matrix to a base station.
  • the method provided by the embodiment of the present invention overcomes the problem of using the constant modulus codebook in the related art by transmitting the weight magnitude D information of the codebook matrix W, and provides conditions for changing the value of the codebook, so that when the dimensionality feedback is used Performance is guaranteed.
  • FIG. 2 is a flowchart of another method for acquiring channel information according to an embodiment of the present invention.
  • the method shown in Figure 2 includes:
  • Step 201 the terminal performs channel measurement according to the channel measurement pilot, and obtains channel measurement information Hf;
  • Step 203 The terminal determines the first matrix P and the weight magnitude information D, where the first matrix P and the weight magnitude information D are determined by the terminal according to the configuration of the base station or the channel measurement information Hf measured by the terminal;
  • Step 204 The terminal further selects a codeword matrix from the r-codebook agreed by the base station and the terminal according to the measured channel measurement information Hf, to obtain a second matrix w, where the weight magnitude information D and The second matrix w collectively characterizes the quantization matrix or precoding matrix W of the channel Hf;
  • Step 205 The terminal feeds back at least the indication information of the second matrix w to the base station.
  • step 205 includes:
  • the terminal feeds back the indication information of the second matrix w and the r information to the base station;
  • the terminal feeds back an indication of the first matrix P, the weight magnitude information D, and the second matrix w to the base station. information;
  • the terminal feeds back the weight magnitude information D to the base station, and the second matrix w Indication information;
  • the terminal feeds back the weight magnitude information P and the second matrix w to the base station. Instructions.
  • the method provided by the embodiment of the present invention overcomes the problem of using the constant modulus codebook in the related art by transmitting the weight magnitude D information of the codebook matrix W, and provides conditions for changing the value of the codebook, so that when the dimensionality feedback is used Performance is guaranteed.
  • a transmission network having at least one base station and at least one terminal.
  • the base station has N TX transmit antennas (or arrays or ports, hereinafter referred to as antennas/arrays/ports).
  • the terminal has an N RX antenna/array/port.
  • Step 1 The base station transmits a beam pilot that is activated by the first precoding matrix P;
  • the first precoding matrix P is a complex matrix of N TX ⁇ N C , where N TX >N C ⁇ 1.
  • the columns and columns of P are mutually orthogonal.
  • P is an N TX ⁇ N C matrix
  • each column of P can be understood as a fundamental vector reflecting multipath direction and polarization information, and is performed by three DFT (Discrete Fourier Transform) vectors. Ronecke got it.
  • the obtaining method may be: decomposing the channel H, decomposing into a plurality of the multipath weighted combinations, and selecting an effective multipath according to the weight magnitude information. And determining N C column vectors in P according to the selected plurality of multipaths.
  • the channel rank fed back by the terminal is equal to 1
  • at least one of the diagonal elements in the D matrix is unequal to the other elements.
  • the elements on the diagonal of D are equal.
  • the base station needs to indicate the D matrix to the terminal.
  • the channel rank is 1 or the rank is greater than 1, but all the data streams use the same D matrix, only one D matrix needs to be calculated, which can be obtained by one of the following methods.
  • Steps a) to c) are the same as method 1, wherein step d) can also be replaced by the following method: eigenvalue decomposition of the R matrix, obtaining the largest N c eigenvalues, and diagonalizing it to form a D matrix.
  • Steps a) to c) are the same as method 1, wherein step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements and diagonally Form a D matrix.
  • Step 2 The terminal receives the beam pilot and feeds back the second precoding matrix W according to the beam pilot.
  • W may be a codebook of the LTE standard.
  • Embodiment 2 The D matrix is acquired at the base station, and the channel Rank is greater than 1, and each Rank uses a different D matrix.
  • a transmission network having at least one base station and at least one terminal.
  • the base station has N TX transmit antennas/array/ports.
  • the terminal has an N RX antenna/array/port.
  • Step 1 The base station transmits a beam pilot that is activated by the first precoding matrix P;
  • the first precoding matrix P is a complex matrix of N TX ⁇ N C , where N TX >N C ⁇ 1.
  • the columns and columns of P are mutually orthogonal.
  • P is an N TX ⁇ N C matrix
  • each column of P can be understood as a fundamental vector reflecting multipath direction and polarization information, which is obtained by Kronecker product from three DFT vectors.
  • the obtaining method may be: decomposing the channel H, decomposing into a plurality of the multipath weighted combinations, and selecting an effective multipath according to the weight magnitude information. And determining N C column vectors in P according to the selected plurality of multipaths.
  • the channel rank fed back by the terminal is equal to 1
  • at least one of the diagonal elements in the D matrix is unequal to the other elements.
  • each rank has a D matrix.
  • P 1, i is the i th data P 1 on the matrix layer
  • P 1 matrix on the different data layers may be different.
  • the base station needs to indicate the D matrix to the terminal.
  • the channel rank is greater than 1 and the different data streams use different D matrices, more than one D matrix needs to be calculated, which can be obtained by one of the following methods.
  • H UL (i, k) H UL (i, k) H ;
  • R d) eigenvalue decomposition
  • U a matrix and ⁇ is a diagonal matrix, then the matrix consisting of the first N c rows and N c columns of ⁇ is the D matrix;
  • Step d) can also be replaced by the following method, eigenvalue decomposition of the R matrix, obtaining the largest N c eigenvalues, and diagonalizing it to form a D matrix;
  • Step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements, and diagonalized to form a D matrix.
  • the D matrix on the i-th data layer can multiply the above-mentioned D matrix by a different phase rotation, which is:
  • H UL (i, k) H UL (i, k) H ;
  • the singular values of different data layer selections are at least one different. For example, in two layers, the first layer selects the previous N C singular values, while the second layer selects N C +1 to 2N C singular values.
  • Step d) can also be replaced by the following method: eigenvalue decomposition of the R matrix, taking N C eigenvalues of the R matrix, and diagonalizing them to form a matrix is a D matrix.
  • different data layers select at least one different feature value. For example, in two layers, the first layer selects the N C eigenvalues from the previous pair, and the second layer selects the C eigen values from N C +1 to 2 N.
  • Step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements, and diagonalized to form a D matrix.
  • the values selected by different data layers are at least one different. For example, in two layers, the first layer selects the previous N C values, and the second layer selects the values from N C +1 to 2N C.
  • Step d) can also be replaced by the following method: eigenvalue decomposition of the R matrix, obtaining the largest N c eigenvalues, and diagonalizing it to form a D matrix.
  • Step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements, and diagonalized to form a D matrix.
  • Step 2 The terminal receives the beam pilot and feeds back the second precoding matrix W according to the beam pilot.
  • W may be a codebook of the LTE standard.
  • a transmission network having at least one base station and at least one terminal.
  • the base station has N TX transmit antennas/array/ports.
  • the terminal has an N RX antenna/array/port.
  • Step 1 The base station transmits a beam pilot that is activated by the first precoding matrix P;
  • the first precoding matrix P is a complex matrix of N TX ⁇ N C , where N TX >N C ⁇ 1.
  • the columns and columns of P are mutually orthogonal.
  • the norm of each column element of P is equal.
  • P is an N TX ⁇ N C matrix
  • each column of P can be understood as a fundamental vector reflecting multipath direction and polarization information, which is obtained by Kronecker product from three DFT vectors.
  • the obtaining method may be: decomposing the channel H, decomposing into a plurality of the multipath weighted combinations, and selecting an effective multipath according to the weight magnitude information. And determining N C column vectors in P according to the selected plurality of multipaths.
  • Step 2 The base station transmits a non-beam pilot
  • the non-beam pilot refers to a period in which no pilot is transmitted when the pilot is transmitted, and a period in which the non-beam pilot is transmitted is greater than a period of the beam pilot.
  • Step 3 The terminal receives the beam pilot and the non-beam pilot, and feeds back the second precoding matrix W according to the beam pilot and the non-beam pilot.
  • W 1 is a codebook of the LTE standard.
  • the channel rank is equal to 1, at least one of the diagonal elements in the D matrix is unequal to the other elements.
  • the elements on the diagonal of D are equal.
  • the terminal needs to feed back the D matrix to the base station when the channel rank is equal to one.
  • the channel rank is 1 or the rank is greater than 1, but all the data layers use the same D matrix, only one D matrix needs to be calculated, which can be obtained by one of the following methods.
  • Step d) can also be replaced by the following method: eigenvalue decomposition of the R matrix, obtaining the largest N c eigenvalues, and diagonalizing it to form a D matrix.
  • Step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements, and diagonalized to form a D matrix.
  • Step a) measuring the power P i , i 1, ..., N c of the beam pilot port and forming it into a diagonal matrix is a D matrix;
  • Embodiment 4 The D matrix is acquired at the terminal, and the channel Rank is greater than 1 or different ranks use different D matrices.
  • a transmission network having at least one base station and at least one terminal.
  • the base station has N TX transmit antennas/array/ports.
  • the terminal has an N RX antenna/array/port.
  • Step 1 The base station transmits a beam pilot that is activated by the first precoding matrix P;
  • the first precoding matrix P is a complex matrix of N TX ⁇ N C , where N TX >N C ⁇ 1.
  • the columns and columns of P are mutually orthogonal.
  • the norm of each column element of P is equal.
  • P is an N TX ⁇ N C matrix
  • each column of P can be understood as a fundamental vector reflecting multipath direction and polarization information, which is obtained by Kronecker product from three DFT vectors.
  • the obtaining method may be: decomposing the channel H, decomposing into a plurality of the multipath weighted combinations, and selecting an effective multipath according to the weight magnitude information. Determining N C column vectors in P according to the selected plurality of multipaths
  • Step 2 The base station transmits a non-beam pilot
  • the non-beam pilot refers to a period in which no pilot is transmitted when the pilot is transmitted, and a period in which the non-beam pilot is transmitted is greater than a period of the beam pilot.
  • Step 3 The terminal receives the beam pilot and the non-beam pilot, and feeds back the second precoding matrix W according to the beam pilot and the non-beam pilot.
  • W 1 is a codebook of the LTE standard.
  • the channel rank is greater than 1, there is one D matrix for each rank.
  • P 1, i is the i th data P 1 on the matrix layer
  • P 1 matrix on the different data layers may be different.
  • the terminal needs to feed back the D matrix to the base station.
  • the channel rank is 1 or the rank is greater than 1, but all the data layers use the same D matrix, only one D matrix needs to be calculated, which can be obtained by one of the following methods.
  • Step d) can also be replaced by the following method: eigenvalue decomposition of the R matrix, obtaining the largest N c eigenvalues, and diagonalizing it to form a D matrix.
  • Step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements, and diagonalized to form a D matrix.
  • Step a) measuring the power P i , i 1, ..., N c of the beam pilot port and forming it into a diagonal matrix is a D matrix;
  • the channel rank is greater than 1 and the different data streams use different D matrices, more than one D matrix needs to be calculated, which can be obtained by one of the following methods.
  • Step d) can also be replaced by the following method: eigenvalue decomposition of the R matrix, obtaining the largest N c eigenvalues, and diagonalizing it to form a D matrix.
  • Step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements, and diagonalized to form a D matrix.
  • the D matrix on the i-th data layer can multiply the above-mentioned D matrix by a different phase rotation, which is:
  • N C represent the jth rotation phase of the i th data layer. It is obtained by the terminal based on channel or multipath information.
  • the singular values of different data layer selections are at least one different. For example, in two layers, the first layer selects the previous N C singular values, while the second layer selects N C +1 to 2N C singular values.
  • Step d) can also be replaced by the following method: eigenvalue decomposition of the R matrix, taking N C eigenvalues of the R matrix, and diagonalizing them to form a matrix is a D matrix.
  • different data layers select at least one different feature value. For example, in two layers, the first layer selects the N C eigenvalues from the previous pair, and the second layer selects the C eigen values from N C +1 to 2N.
  • Step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements, and diagonalized to form a D matrix.
  • the values selected by different data layers are at least one different. For example, in two layers, the first layer selects the previous N C values, and the second layer selects the values from N C +1 to 2N C.
  • Step d) can also be replaced by the following method: eigenvalue decomposition of the R matrix, obtaining the largest N c eigenvalues, and diagonalizing it to form a D matrix.
  • Step d) can also be replaced by the following method, and the diagonal elements of the R matrix are obtained and sorted to obtain the largest N c elements, and diagonalized to form a D matrix.
  • FIG. 3 is a structural diagram of an apparatus for acquiring channel information according to an embodiment of the present invention.
  • the device is disposed at a terminal, and the device includes:
  • the channel obtaining module 301 is configured to obtain the channel Hp between the measured M ports of the base station and the terminal;
  • the amplitude obtaining module 302 is configured to obtain the weight magnitude information D;
  • the sending module 304 is configured to feed back the indication information and the r information of the codeword matrix to the base station.
  • the weight magnitude information D is amplitude adjustment information of elements in the codeword matrix w.
  • the codeword matrix w is a constant modulus codeword.
  • the weight magnitude information D information is one or more diagonal matrices.
  • At least one element of the diagonal matrix diagonal element has 0.
  • the value of the rank RI is divided into X groups, and each group includes a value of a different rank RI.
  • the amplitude obtaining module obtains the weight magnitude information D, and the amplitude acquiring module obtains the rank RI according to the rank RI.
  • the value r determines the rank RI group in which the rank RI group obtains the weight magnitude information D corresponding to the rank RI group.
  • the amplitude obtaining module is configured to obtain the same number of weight magnitude information D as the number of r when r is greater than 1, including D1, D2, ... Dr, and the D1, D2, ..., Dr information are respectively
  • the weight magnitude information D is configured by the base station through the downlink control channel.
  • the weight magnitude information D is determined by the terminal according to the channel measurement pilot, and the sending module is further configured to feed back the weight magnitude information D to the base station.
  • the D information is a singular value of the channel matrix Hp or is a channel autocorrelation matrix. Characteristic value.
  • the embodiment further provides a base station, as shown in FIG. 5, including a first module 501 and a second module 502, where
  • the first module 501 is configured to perform precoding using a matrix P when transmitting a channel measurement pilot, where the matrix P is fed back by a terminal or obtained according to an uplink channel measurement result;
  • the second module 502 is configured to map the channel measurement pilots precoded using the matrix P by Nt physical antenna units to M antenna ports, where Nt and M are integers, and M is less than or equal to Nt.
  • the matrix P, the weight magnitude information D, and the codeword matrix w information are used to obtain channel quantization information W of the channel Hf between the Nt physical antenna elements and the terminal.
  • the channel quantization information W P ⁇ D ⁇ w, where ⁇ represents a matrix product operation.
  • the matrix P, the weight magnitude information D1, D2, ..., Dr, and the codeword matrix w information are used to obtain channel quantization information W of the channel Hf between the Nt physical antenna elements and the terminal.
  • the channel quantization information W P ⁇ [D1 ⁇ w(:,1)...Dr ⁇ w(:,r)], where ⁇ represents a matrix product operation.
  • the apparatus provided by the embodiment of the present invention overcomes the problem of using the constant modulus codebook in the related art by transmitting the weight magnitude D information of the codebook matrix W, and provides conditions for changing the value of the codebook, so that when the dimensionality feedback is used Performance is guaranteed.
  • FIG. 4 is a structural diagram of another apparatus for acquiring channel information according to an embodiment of the present invention.
  • the device shown in Figure 4 includes:
  • the measurement information obtaining module 401 is configured to perform channel measurement according to the channel measurement pilot to obtain channel measurement information Hf;
  • the determining module 403 is configured to determine the first matrix P and the weight magnitude information D, wherein the first matrix P, the weight magnitude information D is determined by the terminal according to the base station configuration determination or the channel information Hf measured by the terminal;
  • the code matrix obtaining module 404 is configured to select a codeword matrix from the r-codebook agreed by the base station and the terminal according to the measured channel measurement information, to obtain a second matrix w, wherein the weight magnitude information D And a quantization matrix or precoding matrix W that characterizes channel information together with the second matrix w;
  • the feedback module 405 is configured to at least feed back indication information of the second matrix w.
  • the feedback module 405 is configured to:
  • the feedback module feeds back the indication information of the second matrix w and the r information to the base station; when the first matrix P, The weight magnitude information D is determined by the determining module according to the measured channel measurement information Hf Determining, the feedback module feeds back indication information of the first matrix P, the weight magnitude information D, and the second matrix w to the base station; when the first matrix P is determined by the determining module according to the configuration of the base station, the weight When the amplitude information D is determined by the determining module according to the measured channel measurement information Hf, the feedback module feeds back the indication information of the weight magnitude information D and the second matrix w to the base station; when the first matrix P is The determining module determines, according to the measured channel measurement information Hf, when the weight magnitude information D is determined by the determining module according to the configuration of the base station, the feedback module feeds back the weight magnitude information P and the second matrix w to the base station. Instructions.
  • the weight magnitude information D is amplitude adjustment information of elements in the second matrix w.
  • the second matrix w is a constant modulus codeword.
  • the weight magnitude information D is one or more diagonal matrices.
  • the diagonal elements of the diagonal matrix have at least two different amplitudes.
  • At least one element of 0 is present in the diagonal element of the diagonal matrix.
  • the determining module determines the weight magnitude information D, the determining module determines the RI group in which the RI group is located according to the RI value, and obtains the weight magnitude information corresponding to the RI group according to the RI group, wherein the terminal and the terminal The base station agrees to divide the value of the RI into X groups, each group containing different RI values.
  • the determining module obtains the same number of D information as the number of r, D1, D2, ... Dr, and the D1, D2, ... Dr information is combined with the r columns of w for common Characterizing the quantized information of the channel Hf.
  • the quantization information of the channel Hf is W ⁇ P ⁇ [D1 ⁇ w (:, 1) ... Dr ⁇ w (:, r)].
  • the weight magnitude information D is configured by the base station through the downlink control channel.
  • the weight magnitude information D is determined by the determining module according to the channel measurement pilot, and the feedback module is further configured to feed back the weight magnitude information D to the base station.
  • the first matrix P is configured by the base station by using a downlink control channel, and the base station and the terminal agree to divide the value of the RI into Y groups, and the base station allocates a corresponding first matrix P for different RI groups.
  • the feedback module is further configured to feed back the first matrix P, wherein the base station and the terminal agree to divide the value of the RI into Y groups, and the base station and the terminal agree to use the respective RI group for
  • the first matrix P quantizes the fed back codebook 1, codebook 2, ... codebook Y, the codebook 1 ... codebook Y is not identical (the incompleteness means at least one codebook and other codes) This is different, that is, not all the same).
  • the apparatus provided by the embodiment of the present invention overcomes the problem of using the constant modulus codebook in the related art by transmitting the weight magnitude D information of the codebook matrix W, and provides conditions for changing the value of the codebook, so that when the dimensionality feedback is used Performance is guaranteed.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • each device/function module/functional unit in the above embodiment When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the embodiment of the present invention overcomes the problem of using the constant modulus codebook in the related art by transmitting the weight magnitude D information of the codebook matrix W, and provides conditions for changing the value of the codebook, so that the performance is guaranteed in the dimensionality reduction feedback.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant l'acquisition d'informations de canal. Le procédé comprend les étapes suivantes : un terminal acquiert un canal mesuré Hp entre M ports et le terminal ; le terminal acquiert des d'informations d'amplitude de poids D ; selon le canal mesuré Hp, le terminal détermine qu'un rang RI du canal est égal à r, et choisit une matrice de code w dans un livre de codes désigné par une station de base et le terminal dont le rang est r, et la matrice w et les informations d'amplitude de poids D sont utilisées conjointement pour caractériser des informations quantitatives sur le canal Hp ; et le terminal retourne à la station de base les informations d'indication et les informations de rang de la matrice de code.
PCT/CN2015/090797 2015-04-20 2015-09-25 Procédé et dispositif d'acquisition d'informations de canal WO2016169213A1 (fr)

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