Gaussian and Fading Multiple Access using Linear Physical-layer Network Coding

This paper concerns with efficient communication over Gaussian and fading multiple-access channels (MACs). Existing orthogonal multiple-access (OMA) and power-domain nonorthogonal-OMA (NOMA) cannot achieve all rate-tuples in the MAC capacity region. Meanwhile, code-domain NOMA schemes usually requir...

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Veröffentlicht in:IEEE transactions on wireless communications Jg. 22; H. 5; S. 1
Hauptverfasser: Chen, Qiuzhuo, Yu, Fangtao, Yang, Tao, Liu, Rongke
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.05.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
coded modulation
Codes
Coding
compute-forward
Decoding
Domains
Fading
Fading channels
Information transfer
Iterative decoding
Iterative methods
Matrices (mathematics)
Messages
Modulation
multiple access
Network coding
NOMA
Nonorthogonal multiple access
Optimization
physical-layer network coding
Pulse amplitude modulation
Receivers
successive interference cancellation
ISSN:1536-1276, 1558-2248
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Zusammenfassung:This paper concerns with efficient communication over Gaussian and fading multiple-access channels (MACs). Existing orthogonal multiple-access (OMA) and power-domain nonorthogonal-OMA (NOMA) cannot achieve all rate-tuples in the MAC capacity region. Meanwhile, code-domain NOMA schemes usually require big-loop receiver-iterations for multi-user decoding, which is subject to high implementation cost and latency. This paper studies a linear physical-layer network coding multiple access (LPNC-MA) scheme that is capable of achieving any rate-tuples in the MAC capacity region without receiver iterations. For deterministic Gaussian MACs with M users, we propose to utilize q -ary irregular repeat accumulate (IRA) codes over finite integer fields/rings and q -ary pulse amplitude modulation ( q -PAM) as the underlying coded-modulation. The receiver sequentially computes M network coded (NC) messages of the M users. All users' messages are then recovered by solving the computed M NC messages via the inverse of the NC coefficient matrix. A joint nested code construction and extrinsic information transfer (EXIT) chart based code optimization method is developed, yielding near-capacity performance (within 0.7 and 1.1 dB the capacity limits for two and three users respectively). For fading MAC, we study the symmetric rate of LPNC-MA, and propose a pragmatic method for identifying the mutual information (MI) maximizing network coding coefficient matrix. Numerical results demonstrate that the frame error rate (FER) of the optimized LPNC-MA is within a fraction of dB the outage probability of fading MAC capacity. LPNC-MA remarkably outperforms NOMA-SIC and IDMA while avoiding the big-loop receiver iteration.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2022.3216002