Windowed Joint Detection and Decoding with IR-HARQ for Asynchronous SCMA Systems
Author:
Guan Mengsheng1ORCID, Zhu Min12, Bai Baoming1
Affiliation:
1. The State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China 2. Science and Technology on Communication Networks Laboratory, Shijiazhuang 050081, China
Abstract
To improve the decoding performance of asynchronous sparse code multiple access (SCMA) systems over additive white Gaussian noise (AWGN) channels, this paper proposes a novel windowed joint detection and decoding algorithm for a rate-compatible (RC), LDPC code-based, incremental redundancy (IR) hybrid automatic repeat quest (HARQ) scheme. Since incremental decoding can exchange information iteratively with the detections made at previous consecutive time units, we propose a windowed joint detection and decoding algorithm. The extrinsic information exchanging process is performed between the decoders and the previous w detectors at different consecutive time units. Simulation results show that the sliding-window IR-HARQ scheme for the SCMA system outperforms the original IR-HARQ scheme with a joint detection and decoding algorithm. The throughput of the SCMA system with the proposed IR-HARQ scheme is also improved.
Funder
National Key R&D Program of China National Natural Science Foundation of China
Subject
General Physics and Astronomy
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