STBC CDMA system simulation in MIMO channels with correlative model

In this contribution, Space-Time Block Coding (STBC) Code Division Multiple Access (CDMA) system is simulated to investigate the effect of spatial correlation of Multiple-input multiple-output (MIMO) wireless channels. In practical situations the MIMO antennas are spatially correlated, due to the lack of spacing between them or weak scattering. The correlative model is considered for MIMO channel and simulation results declare that spatial correlation degrades the performance of STBC CDMA system. However, having some information about the channel of each active user at the transmitter, a linear precoder can be exploited, in conjunction with the coding block, to mitigate the effect of correlation in multiuser system which has not been addressed before. In order to design this precoder, the equations of STBC CDMA system, are reconfigured in this paper. Simulation results illustrate that despite the number of interfering users, the anti-correlation precoder could mitigate the performance degradation produced in correlative model. © 2009 IEEE.