Regular APSK Constellation Design for Beyond 5G
Zhe Zhao, Chulong Liang, Xu Jin, Liguang Li, Ruiqi Liu · 2022 International Wireless Communications and Mobile Computing (IWCMC) · 2022
In this paper, we combine regular amplitude phase-shift keying (RAPSK) constellation with Gray mapping for link-level performance improvement. Under the criteria of the bit-interleaved coded modulation (BICM) mutual information (MI), we search for optimal Gray-mapped RAPSK (Gray-RAPSK) constellation with a given size. We design the labeling for Gray-RAPSK constellation based on bit-level MI. Simulation results show that shaping gains more than 0.5 dB are obtained for the 256-ary Gray-RAPSK constellation at the block error rate (BLER) of 10−2in the high spectral efficiency region. In addition, simulation results show that the error floor of low-density parity-check (LDPC) coding combined with Gray-RAPSK constellation is lower than that with quadrature amplitude modulation (QAM) constellation.