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Iterative multiuser detector-decoding for nonbinary LDPC coded multicarrier MFSK systems

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  • Her-Chang Tsai

    (Institute of Computer and Communication, National Cheng-Kung University)

Abstract

This paper investigates an iterative multiuser detection for nonbinary low density parity check (LDPC) coded multicarrier multiple level frequency shift keying system to increase system performance under specific signal-to-noise ratio and data rate. We propose three-level hard-limited detection probabilities over both additive white Gaussian noise (AWGN) channels and Rayleigh fading channels. During multiuser detection (MUD) process, the hard-limited detection probabilities are computed in advanced and stored in tables. By using table looking up, the MUD soft outputs can be computed efficiently. We test the reliability of soft outputs from nonbinary LDPC channel decoder for all users. If the soft output exceeds a reliability threshold, the user is declared as a reliable user. For each symbol, we count the number of reliable users on it, and, use this information to update the soft output of MUD during the iterative multiuser detection and decoding process, which cancel multiple access interference iteratively. Numerical results show that the performances of three-level hard-limited systems outperform two-level hard-limited systems over AWGN channels and Rayleigh fading channels.

Suggested Citation

  • Her-Chang Tsai, 2019. "Iterative multiuser detector-decoding for nonbinary LDPC coded multicarrier MFSK systems," Telecommunication Systems: Modelling, Analysis, Design and Management, Springer, vol. 70(2), pages 309-320, February.
    • Handle: RePEc:spr:telsys:v:70:y:2019:i:2:d:10.1007_s11235-018-0520-7
    DOI: 10.1007/s11235-018-0520-7
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    Cited by:

    1. Komal Arora & Jaswinder Singh & Yogeshwar Singh Randhawa, 2020. "A survey on channel coding techniques for 5G wireless networks," Telecommunication Systems: Modelling, Analysis, Design and Management, Springer, vol. 73(4), pages 637-663, April.

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