On LLR Clipping in BICM-IDD Non-Coherent MIMO Communications

In this letter a method is proposed for improving the performance of a BICM non-coherent MIMO communication system with iterative demapping and decoding. This method is based on adapting the clipping thresholds of the log-likelihood ratios of the demapper and the decoder to the channel realizations observed by each block. The method is particularly suited for systems in which the data blocks are relatively short and for systems in which list demapping is employed at the receiver.