Iterative interference cancellation and ordered array processing for groupwise space time trellis coded (GSTTC) systems

In this paper, an iterative interference cancellation (IIC) scheme is proposed for the ordered zero-forcing (ZF) algorithm to regain the signal energies lost during the interference suppression (IS) process in groupwise space lime trellis coded (GSTTC) systems. Both hard decision and soft decision based IIC are studied. With hard decision based IIC, significant improvement over the ordered ZF algorithm is achieved and a performance comparable to that of the complex ordered maximum SNR (MaxSNR) algorithm is reached. With soft decision IIC, the proposed scheme can even outperform the ordered MaxSNR algorithm and provides a better performance-complexity tradeoff in systems with large number of antennas and simple space time trellis codes.