Method and apparatus for transmitting channel state information in wireless communication system
摘要
說明書
It may be possible to perform subsampling using only 8th to 15th codewords instead of 0th to 7th in Table 5 using the same principle. Due to the same subsampling principle, only an index is different but codebook performance is not changed.
As another method, a 4-bit payload may be transmitted in type 5 report so as to enhance reception decoding probability. In this case, a joint encoding method of RI and the subsampled W1 may be applied to Table 6 below. A total of 9 hypotheses are present and thus can be represented in 4 bits, and an index of RI and W for each hypothesis is shown in Table 6 below. For example, 0th hypothesis refers to RI=1 and W1 index 0 and first hypothesis refers to RI=1 and W1 index 2. W1 codebook for ranks 3 and 4 is an identity matrix, and thus separate signaling for W1 is not required.
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