Joint Coding Rate and Modulation Format Optimization for 8QAM Constellations Using BICM Mutual Information
15 June 2015
We compare the BICM mutual information of different 8-QAM constellations and we show that Circular-8QAM is attractive for high coding rates while quadrature optimized Rect-8QAM provides best performance for low coding rates. Both formats are shown to outperform Star-8QAM. Results are confirmed by 41.6 Gbaud experimental transmissions.
