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Optimal power adaptive decode-and-forward cooperative device-to-device communication policies
IET Communications ( IF 1.6 ) Pub Date : 2020-04-30 , DOI: 10.1049/iet-com.2019.0529
Rahul Sharma 1 , Sainath Bitragunta 1
Affiliation  

Cooperative device-to-device (D2D) wireless systems use relays such as amplify-and-forward (AaF) and decode-and-forward (DaF). The AaF relay is simple to implement but amplifies noise as well. Conventional DaF relay does decoding and acts as a regenerative relay, hence deliver better noise performance. In this study, the authors generalise the cooperative D2D model by designing power adaptive decode-and-forward relays. In it, the probabilistically selected relay subject to an average relay transmit power constraint does decoding and jointly adapt its gain and transmit power as a function of the channel gains to the destination link. For the proposed cooperative D2D system model, the authors derive the optimal relaying policies which set relay gains to (i) minimise the fading averaged symbol error rate; (ii) maximise fading averaged spectral efficiency and (iii) maximise fading averaged energy efficiency. Then they present a comprehensive performance analysis of the optimal policies. The mathematical analysis includes derivations of exact expressions and their upper bound expressions. To further extend the FAvSER analysis, they investigate diversity order in an insightful scaling regime. Then they present extensive numerical results to validate the derived analytical expressions and to show that the proposed optimal relaying policies outperform the benchmark policies.

中文翻译:

最佳功率自适应解码转发协作设备间通信策略

协作的设备到设备(D2D)无线系统使用中继,例如放大转发(AaF)和解码转发(DaF)。AaF继电器易于实现,但也会放大噪声。传统的DaF中继可以解码并充当再生中继,因此可提供更好的噪声性能。在这项研究中,作者通过设计功率自适应解码转发中继来概括协作D2D模型。在其中,受平均中继器发射功率约束的概率选择的中继器进行解码,并根据到达目标链路的信道增益共同调整其增益和发射功率。对于提出的协作式D2D系统模型,作者得出了最佳中继策略,该策略将中继增益设置为(i)最小化衰落平均符号错误率;(ii)最大化衰落平均频谱效率,以及(iii)最大化衰落平均能量效率。然后,他们对最佳策略进行了全面的性能分析。数学分析包括精确表达式及其上限表达式的推导。为了进一步扩展FAvSER分析,他们研究了具有洞察力的缩放机制中的多样性顺序。然后,他们给出了广泛的数值结果,以验证所得出的解析表达式,并表明所提出的最佳中继策略优于基准策略。他们以有洞察力的扩展机制研究多样性顺序。然后,他们给出了广泛的数值结果,以验证所得出的解析表达式,并表明所提出的最佳中继策略优于基准策略。他们以有洞察力的扩展机制研究多样性顺序。然后,他们给出了广泛的数值结果,以验证所得出的解析表达式,并表明所提出的最佳中继策略优于基准策略。
更新日期:2020-04-30
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