This paper assumes two users and a two‐way relay network with the combination of 2×2 multi‐input multi‐output (MIMO) and nonorthogonal multiple access (NOMA). To achieve network reliability without sacrificing network throughput, network‐coded MIMO‐NOMA schemes with convolutional, Reed‐Solomon (RS), and turbo codes are applied. Messages from two users at the relay node are network‐coded and combined in NOMA scheme. Interleaved differential encoding with redundancy (R‐RIDE) scheme is proposed together with MIMO‐NOMA system. Quadrature phase‐shift keying (QPSK) modulation technique is used. Bit error rate (BER) versus signal‐to‐noise ratio (SNR) (dB) and average mutual information (AMI) (bps/Hz) versus SNR (dB) in NOMA and MIMO‐NOMA schemes are evaluated and presented. From the simulated results, the combination of MIMO‐NOMA system with the proposed R‐RIDE‐Turbo network‐coded scheme in two‐way relay networks has better BER and higher AMI performance than conventional coded NOMA system. Furthermore, R‐RIDE‐Turbo scheme in MIMO‐NOMA system outperforms the other coded schemes in both MIMO‐NOMA and NOMA systems.

中文翻译：

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双向中继网络中带有FEC代码的网络编码MIMO-NOMA系统

本文假设两个用户和一个双向中继网络，将2×2多输入多输出（MIMO）和非正交多址（NOMA）相结合。为了在不牺牲网络吞吐量的情况下实现网络可靠性，应用了具有卷积码，里德所罗门（RS）和Turbo码的网络编码MIMO-NOMA方案。来自中继节点上两个用户的消息经过网络编码，并以NOMA方案合并。提出了带冗余的交错差分编码（R-RIDE）方案以及MIMO-NOMA系统。使用正交相移键控（QPSK）调制技术。评估并提出了NOMA和MIMO-NOMA方案中的误码率（BER）与信噪比（SNR）（dB）和平均互信息（AMI）（bps / Hz）与SNR（dB）的关系。根据模拟结果 在双向中继网络中将MIMO‐NOMA系统与拟议的R‐RIDE‐Turbo网络编码方案相结合，比传统的编码NOMA系统具有更好的BER和更高的AMI性能。此外，MIMO-NOMA系统中的R-RIDE-Turbo方案优于MIMO-NOMA和NOMA系统中的其他编码方案。