Bit-Interleaved Coded Modulation With Mismatched Decoding Metrics
Bit-Interleaved Coded Modulation (BICM) has become the de facto coding standard for communication systems. Recently, BICM has been cast as a mismatched decoding scheme due to the assumption of independent bit metrics. In addition to this inherent mismatch, practical demodulators may produce mismatched decoding metrics because of implementation constraints, such as clipping and metric approximation to reduce computational complexity. In this paper, the authors investigate BICM with such metrics. In line with recent works on this topic, they adopt the Generalized Mutual Information (GMI) as the pertinent performance measure.