Performance analysis of receive diversity technique for wireless systems using partial channel knowledge

In this paper, we consider Single Input Multiple Output (SIMO) systems with Maximum Ratio Combining(MRC) and Equal Gain Combining (EGC). We assume spatially independent and timely correlated Rayleigh flat fading channels, modeled by AR2 processes. We consider a frame of N+2 symbols, where Channel State Information at Receiver (CSIR) is available in the beginning for two consecutive symbols, also called as partial CSIR. Using this CSIR, we predict CSIR for the remaining N symbols and detect them. For this partially coherent systems, we have derived closed-form expressions of BER for BPSK constellation. We have also presented simulation results and verified our analytical expressions. We have shown the effects of frame size N, time varying condition of channel by doppler frequency ω_d on BER. We have compared performance of the SIMO systems with SISO system and shown significant improvement in BER over SISO systems.