Performance Analysis of a Scheme Combined STBC with Beamforming in Spatial Correlated Channel

Many space time block code (STBC) schemes have been proposed to achieve reliable communications over independent and identical distributed (i.i.d.)fading channels. However, the fading of realistic wireless channel is spatial correlated. Recently Zhou-Giannakis and Jongren-Skoglund-Ottersten proposed a new design criterion and algorithm that combined the STBC with linear beamforming assuming the transmitter had perfect or partial feedback information from the receiver. In this paper, we apply the exponential correlation model to model channel spatial correlation and provide the theoretical bit-error probabilities (BEPs) of the robust scheme combing STBC with beamforming based on this model. Analytical and simulation results are presented to verify our theoretical analysis. The results also show that the performance gain obtained by this robust scheme increases evidently as the maximum Doppler frequency becomes larger.