Calculation and error bound of Min‐approximated bitwise log‐likelihood ratios of generalised M ‐ary PAM. Issue 3 (20th January 2020)

• Record Type: Journal Article
• Authors: Park, Sung‐Joon; Lee, Daniel C.
• Is Part Of: Journal of engineering. Volume 2020:Issue 3(2020)
• Page Start: 104
• Page End: 106
• Publication Date: 2020-01-20
• Subjects: computational complexity -- channel coding -- digital communication -- pulse amplitude modulation; channel coding -- spectral efficiency -- coding gain -- computationally efficient method -- ary PAM signals -- Min approximation -- computational complexity -- upper bounds -- approximation error -- Min‐approximated bitwise log‐likelihood ratios -- modern digital communication systems -- high‐order modulation; Engineering -- Periodicals; Engineering; Electronic journals; Periodicals; 620.005
• DOI: 10.1049/joe.2019.1056
• Languages: English
• ISSNs: 2051-3305

Abstract

Abstract : In modern digital communication systems, a high‐order modulation and advanced channel coding are often jointly used to increase the spectral efficiency and coding gain. In this work, the authors investigate a computationally efficient method for evaluating the bitwise log‐likelihood ratios of generalised M ‐ary pulse amplitude modulation (PAM) signals with the Min approximation. The proposed scheme is simple and can be applied to demodulate the M ‐ary PAM having an arbitrary symbol spacing and a bit stream mapping. The computational complexity and upper bounds of the approximation error are also provided for a better understanding of the proposed scheme.