Multi-user multi-input multi-output feedback method and equipment
A multiple-input multiple-output, user equipment technology, applied in the field of communication, can solve problems such as low performance of MU-MIMO, and achieve the effect of improving performance and good flexibility
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Embodiment 1
[0043] The feedback method in the multi-user multi-input multi-out provided by the embodiment of the present invention is illustrated by taking LTE-A (LTE Advanced Evolution) as an example, the base station can have up to 8 transmit antennas, and can be configured in a dual-polarized manner . That is, 4 transmit antennas form a group and are configured in one polarization mode; the other 4 antennas form another group and are configured in another polarization mode. In LTE-A, the dual-polarization configuration mode of 8 transmit antennas of the base station provides the possibility of supporting two-layer transmission for each user, that is, each polarization mode supports one layer.
[0044] When using a rank-2 precoding matrix for transmission, such as figure 1 As shown, the method steps include:
[0045] S101. Among all the precoding matrices of rank 1, obtain the precoding matrix index PMI of rank 1 with the largest channel quality information CQI, where the PMI is the p...
Embodiment 2
[0064] The feedback method in the multi-user multiple-input multiple-output provided by the embodiment of the present invention assumes that one user supports the codeword mapping mode of two-layer transmission and the corresponding CQI reporting mode. When one codeword or two codewords are used to map to two layer, and when using a rank 2 precoding matrix for transmission, such as figure 2 As shown, the method steps include:
[0065] S201. Obtain a rank-1 precoding matrix index PMI with the largest CQI among all rank-1 precoding matrices, where the PMI is a precoding matrix index of a first precoding matrix. Here, for the method of obtaining the maximum CQI, reference may be made to the obtaining method in Embodiment 1.
[0066] S202. Obtain the corresponding CQI1 of the first precoding matrix transmission of rank 1 according to the PMI.
[0067] S203. Obtain the CQI2 of the second precoding matrix transmission of rank 2 according to the PMI. Wherein, the second precoding...
Embodiment 3
[0074] The feedback method in the multi-user multiple-input multiple-output provided by the embodiment of the present invention assumes that one user supports the codeword mapping mode of two-layer transmission and the corresponding CQI reporting mode. When one codeword or two codewords are used to map to two layer, and when using a rank 2 precoding matrix for transmission, such as Figure 6 As shown, the method steps include:
[0075] S601. Obtain a rank-1 precoding matrix index PMI with the largest CQI among all rank-1 precoding matrices, where the PMI is a precoding matrix index of a first precoding matrix. Specifically, such as Figure 7 As shown, is a rank 2 precoding matrix, which contains two column vectors. It is assumed that the number of precoding codewords included in the precoding codebook matrix is K, and the number of transmitting antennas is Nt. That is, for a rank-2 precoding matrix, there are K precoding matrices in total, and each precoding matrix is a...
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