Simplified Soft Demapping Algorithm for Gray-APSK

Jiachen HUANG  Changyong PAN  Kewu PENG  Liwen FAN  Jian SONG  

IEICE TRANSACTIONS on Communications   Vol.E96-B   No.7   pp.1814-1818
Publication Date: 2013/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.1814
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment for Communications
Gray-APSK,  soft demapping,  simplified algorithm,  

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Amplitude phase shift keying (APSK) constellation with Gray mapping was proposed recently. Inspired by the simplified soft demapping for regular Gray-QAM, a simplified soft demapping algorithm for Gray-APSK is proposed in this paper. Compared with conventional soft demapping schemes, its complexity is greatly reduced with only a little SNR loss, which is validated by the complexity analysis and FPGA compilation results.