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Table 1 The overhead comparison

From: R bits user selection switch feedback for zero forcing MU-MIMO based on low rate codebook

Scheme Initialization Quantized CSI Additional Totally feedback bits/period
Conventional 0 B 0 B
USS 0 B (l-1)*r B+(l-1)*r
RVQ N*M*16*2/q B 0 N*M*32/q+B