@article{Yan2015, 
author = {Keqian Yan and Kewu Peng and Fang Yang and Jian Song},
title = {Non-Uniform APSK Optimization for BICM Systems},
year = {2015},
journal = {Tsinghua Science and Technology},
volume = {20},
number = {2},
pages = {175-181},
keywords = {Bit-Interleaved Coded Modulation (BICM), non-uniform Amplitude Phase Shift Keying (APSK), mutual information, geometrical shaping},
url = {https://www.sciopen.com/article/10.1109/TST.2015.7085630},
doi = {10.1109/TST.2015.7085630},
abstract = {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.}
}