Bit-Interleaved Coded Modulation (BICM), non-uniform Amplitude Phase Shift Keying (APSK), mutual information, geometrical shaping
Traditional Amplitude Phase Shift Keying (APSK) consists of rings with points uniformly spaced. By giving up this uniform-spacing feature, we propose an APSK optimization method based on the uniform APSK with Gray labeling (Gray-APSK). The aim of the optimization is to maximize the Generalized Mutual Information (GMI) of Bit-Interleaved Coded Modulation (BICM) for the targeted code rate and channel. We show that our optimized non-uniform APSK could offer further performance gain compared with the conventional uniform Gray-APSK and considerably outperforms the traditional quadrature amplitude modulation at the targeted SNR and channel.
Tsinghua University Press
Keqian Yan, Kewu Peng, Fang Yang et al. Non-Uniform APSK Optimization for BICM Systems. Tsinghua Science and Technology 2015, 20(2): 175-181.