Pre-stage iteration of turbo-BLAST receiver in spatial correlation environments

Although recent theoretical investigations of the spatially correlated multi-input and multi-output (MIMO) antennas system show that it can offer linear capacity growth with increasing number of transmit and receive antennas, research on optimal receiver design of the correlated MIMO system is relatively insufficient. We propose pre-stage iteration turbo-BLAST (PSITB), an improved turbo-BLAST receiver structure. When there are more receive antennas than transmit antennas, the proposed structure can obtain much better BER performance than the original turbo-BLAST receiver by introducing a pre-stage inner information iteration. The simulation also shows that this structure can speed up the convergence of iterative decoding and detection by optimizing the initial point, and thus significantly reduces the computational complexity of the receiver.