Layered Encoding for 16- and 64-QAM Iterative MIMO Receivers

In this paper a novel layered encoding scheme is proposed at the transmitter which allows the iterative receiver to operate with higher-order modulations. In addition, soft output combining, inherent to the iterative receiver architecture, is optimized in this paper as as to maximize the mutual information transfer at each iteration. It is shown that, in conjunction with the layered encoding scheme, the iterative receiver again outperforms the APP-based receiver, at a lower computational complexity.