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An Improved EPA-Based Receiver Design for Uplink LDPC Coded SCMA System

Chai, Lingyun and Liu, Zilong and Xiao, Pei and Maaref, Amine and Bai, Lin (2022) 'An Improved EPA-Based Receiver Design for Uplink LDPC Coded SCMA System.' IEEE Wireless Communications Letters, 11 (5). pp. 947-951. ISSN 2162-2337

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Abstract

Sparse code multiple access (SCMA) is an emerging paradigm for efficient enabling of massive connectivity in future machine-type communications (MTC). In this letter, we conceive the uplink transmissions of the low-density parity check (LDPC) coded SCMA system. Traditional receiver design of LDPC-SCMA system, which is based on message passing algorithm (MPA) for multiuser detection followed by individual LDPC decoding, may suffer from the drawback of the high complexity and large decoding latency, especially when the system has large codebook size and/or high overloading factor. To address this problem, we introduce a novel receiver design by applying the expectation propagation algorithm (EPA) to the joint detection and decoding (JDD) involving an aggregated factor graph of LDPC code and sparse codebooks. Our numerical results demonstrate the superiority of the proposed EPA based JDD receiver over the conventional Turbo receiver in terms of both significantly lower complexity and faster convergence rate without noticeable error rate performance degradation.

Item Type: Article
Uncontrolled Keywords: Receivers; Parity check codes; Complexity theory; Detectors; Uplink; Electronic mail; Receiving antennas; Joint detection and decoding (JDD) receiver; sparse code multiple access (SCMA); expectation propagation algorithm (EPA)
Divisions: Faculty of Science and Health
Faculty of Science and Health > Computer Science and Electronic Engineering, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 07 Sep 2022 10:40
Last Modified: 23 Sep 2022 19:52
URI: http://repository.essex.ac.uk/id/eprint/33431

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