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Table 4 Bit cost of the frequency selective standard complaint FB methods

From: Adaptive CSI and feedback estimation in LTE and beyond: a Gaussian process regression approach

Feedback scheme Bit cost
Wideband 2·(4·N U )
Subband level 2·(4+2·qN U
User-selected \(2 \cdot (4 + 2 +\lceil log_{2} {N_{\tiny {PRB}}^{\tiny {DL}} \choose \tiny {M}} \rceil)\cdot N_{U} \)