Performance Analysis of Finite Rate Feedback MISO Systems in the Presence of Estimation Errors and Delay

In this paper, we analyze the performance of transmit beamforming on multiple input single output (MISO) Rayleigh fading channels with imperfect channel feedback. We characterize the feedback imperfections in terms of noisy channel estimation, feedback delay, and finite rate channel quantization. We develop a novel model that captures the above mentioned three forms of channel imperfections with particular emphasis on modeling the impact of delay more precisely. As opposed to some previous attempts at combining the three forms of imperfection, this modeling approach shows that feedback delay is of a different nature than channel estimation errors. The performance criteria considered is the average symbol error probability of M1 times M2 rectangular QAM constellation. We also present simulation results in support of the derived analytical expressions.