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The spectral efficiency of digital feedback single-user beamforming is given by

$ R_{SU} = E \left[ \log_2(1 + P || \mathbf{h}||^2 cos^2( \angle (h, \hat{h}))) \right] \approx E \left[ \log_2(1 + P || \mathbf{h}||^2 ( 1 - 2^{-\frac{B}{M-1}}) \right] $

where $ \mathbf{h} $ is the channel vector, $ \mathbf{h} $ is quantized digital feedback channel vector, $ P $ is SNR, $ M $ is the number of transmit antennas, and $ B $ is the number of feedback bits.


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