Low complexity post-ordered iterative decoding for generalized layered space-time coding systems

In this paper we refer to the combination of BLAST and space-time coding (STC) for multi-input multi-output systems as generalized layered space-time coding (GLST). A post-ordered decoding algorithm is introduced based on the generalization of the original BLAST ordering detection algorithm. The performance is analyzed through comparison to that of pre-ordered decoding with and without power allocation. Interleavered GLST with a new iterative process is also proposed. It can efficiently exploit full receive antenna diversity and thus significantly improve the system overall performance. Due to hard interference cancellation (IC) and ML decoder in the iterations, the new iterative decoding is much less complex than conventional turbo processing where soft IC and MAP decoder were applied