Performance Analyses of MRT/MRC in NOMA Full-Duplex Relay Networks With Residual Hardware Impairments

IF 5.3 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Mesut Toka;Eray Güven;Güneş Karabulut Kurt;Oğuz Kucur
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Abstract

This paper analyzes the performance of maximum-ratio transmission (MRT)/maximum-ratio combining (MRC) scheme in a dual-hop non-orthogonal multiple access (NOMA) full-duplex (FD) relay networks in the presence of residual hardware impairments (RHIs). The effects of channel estimation errors (CEEs) and imperfect successive interference cancellation are also considered to deal with a more realistic scenario. In the network, the base station and multiple users utilize MRT and MRC, respectively, while a dedicated relay operates in amplify-and-forward mode. Exact outage probability (OP) expression is derived for Nakagami-$m$ fading channels. Furthermore, tight lower bound and asymptotic expressions are also derived to provide further insights in terms of diversity order and array gain. The investigated network has been compared to half-duplex (HD)-NOMA and FD-orthogonal multiple access counterparts. The analytical results validated by simulations and test-bed implementations (by using software defined radios) demonstrate the importance of loop-interference cancellation process in the FD relay for the investigated system to perform better than HD-NOMA counterpart. Also, a performance trade-off between the MRT and MRC schemes is observed under CEE effects among users. Furthermore, it is shown that RHIs have a significant effect on the performance of users with lower power coefficients, however it does not change the diversity order. RHIs and CEEs have the most and least deterioration effects on the system performance, respectively.
带有残余硬件损伤的NOMA全双工中继网络中MRT/MRC的性能分析
本文分析了双跳非正交多址(NOMA)全双工(FD)中继网络中存在残余硬件损伤(RHIs)时最大比传输(MRT)/最大比合并(MRC)方案的性能。此外,还考虑了信道估计误差(cee)和不完全连续干扰对消的影响,以处理更现实的场景。在网络中,基站和多用户分别使用MRT和MRC,而专用中继以放大转发模式工作。导出了Nakagami-$m$衰落信道的精确中断概率(OP)表达式。此外,还推导了紧下界和渐近表达式,以提供有关分集顺序和阵列增益的进一步见解。将所研究的网络与半双工(HD)-NOMA和fd -正交多址对应物进行了比较。通过仿真和试验台实现(通过使用软件定义无线电)验证的分析结果表明,FD继电器中环路干扰消除过程对于所研究系统的性能优于HD-NOMA对应物的重要性。此外,在用户之间的CEE效应下,观察到MRT和MRC方案之间的性能权衡。此外,RHIs对功率系数较低的用户的性能有显著影响,但不会改变用户的分集顺序。RHIs对系统性能的影响最大,cee对系统性能的影响最小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.60
自引率
0.00%
发文量
25
审稿时长
10 weeks
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