Affiliation of Author(s):School of Electronics information Engineering

Teaching and Research Group:Future commun. and networking promotion Group

Journal:IEEE Transactions on Wireless Communications （subject to Minor Revision）

Place of Publication:US

Funded by:National Key R&D program

Key Words:multiple access, compute-forward, network coding, NOMA

Abstract: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 ratetuples 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 physicallayer 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) message sequences, where the previously computed message sequence is used as side information in computing subsequent ones. 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 and LPNC-MA remarkably outperforms NOMA-SIC and IDMA in high spectral efficiency regime, while avoiding the big-loop receiver iteration.

Indexed by:Journal paper

First-Level Discipline:Information and Communication Engineering

Document Type:J

Translation or Not:no

Date of Publication:2022-10-03

Included Journals:SCI

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