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.

See Also Edit

Reference Sites Edit

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