Multi-flow space division multiplexing data retransmission method and device
A data retransmission and division multiplexing technology, which is applied in the data retransmission field of multi-stream space division multiplexing, can solve problems such as lower system performance, poor channel quality, and data transmission errors, so as to improve system performance and improve accuracy Effect
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no. 1 example
[0067] see figure 2 , the figure shows a multi-stream space division multiplexing data retransmission method, the specific steps are as follows:
[0068] Step S201 , the transmitter determines the layer mapping relationship of the retransmitted data block during retransmission, and retransmits the retransmitted data block according to the determined layer mapping relationship of the retransmitted data block.
[0069] The above-mentioned layer mapping relationship of the retransmitted data block during retransmission is the layer mapping relationship of the retransmitted data block updated by the transmitting end during retransmission.
[0070] Step S202, the transmitting end determines the mapping relationship of the precoding matrix column order corresponding to the retransmission data block during retransmission, and retransmits the retransmission data block according to the determined precoding matrix corresponding to the retransmission data block.
[0071] The above prec...
no. 2 example
[0085] see image 3 , the figure shows a data retransmission method suitable for multi-data layer space division multiplexing, and the specific steps are as follows:
[0086] Step S301, data initial transmission.
[0087] It should be noted that the initial data transmission in this embodiment is the same as that in the existing system. The transmitter will N 0 data blocks are mapped to r (0) layer, here N 0 greater than or equal to 1, r (0) greater than or equal to 2. Define that the i-th data block is mapped to the to No. layers, i=0,...,N 0 -1, It should be noted that the number of modulation symbols contained in each layer is the same. The total number of layers r (0) It can be determined by the RI contained in the channel state information (CSI) fed back by the receiving end. According to the PMI (Precoding Matrix Indication) information contained in the CSI, the transmitting end, at rank r (0) Select the corresponding precoding matrix in the codebook Pr...
Embodiment approach 1
[0096] It should be noted that this method only changes the layer mapping relationship between data blocks, and the data blocks are still mapped according to the order of the data layer number, and this method assumes that the total number of data blocks remains unchanged during retransmission.
[0097] The method of circularly shifting data blocks in sequence is adopted. Assuming that the i-th data block needs to be retransmitted, its data is divided into layer. Update the mapping relationship of the retransmitted data block to map the i-th data block that needs to be retransmitted to the to No. layer, where δ n It is a non-zero integer, indicating the displacement during the nth retransmission, which can be greater than zero or less than zero, n=1,2,...,r (n) Indicates the total number of layers mapped by all data block layers at the nth retransmission, Indicates the sum of layers mapped to all data blocks before the i-th data block at the nth retransmission, and sa...
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