## FANDOM

186 Pages

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.