Figure 5

A plot of the ergodic achievable rate as a function of the number of feedback bits for a random codebook when System SNR is 10 dB and round-robin scheduling is employed. The blue curves correspond to the case where the bit error probability is , whereas for the red curves . "Cent'' denotes the centralised framework and "Decent'' the decentralised one. It can be seen that with 16 bits we get relatively close to the performance of the perfect CSI case in the absence of feedback errors (black uppermost line).