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A Novel Resource Allocation for SWIPT-NOMA Enabled AF Relay Based Cooperative Network
Wireless Personal Communications ( IF 2.2 ) Pub Date : 2021-02-20 , DOI: 10.1007/s11277-021-08150-7
V. Narasimha Nayak , Kiran Kumar Gurrala

In this work, a novel resource allocation scheme is proposed to find the optimal time-switching and power-splitting factors in a SWIPT assisted non-orthogonal multiple access (NOMA) relay network with combined time switching and power splitting protocol. The system model consists of a source node broadcasting a multiplexed NOMA signal to the far and near user via an amplify-and-forward energy harvesting relay node in a Rayleigh-flat-fading channel environment. Here, effective SNR maximization at both the near and far users is formulated as an optimization problem under total transmit power constraint and to deal with this both the Lagrangian multiplier approach and differential-evolution algorithm have been exploited. Furthermore, performance study is presented about the comparison of proposed scheme with the fixed allocation scheme in terms of outage probability under the impact of distinct target rates, relay locations, and channel conditions. Finally, the simulation results signify the performance improvement in the system with the optimal values obtained from the proposed scheme over the fixed time and power splitting factors.



中文翻译:

基于SWIPT-NOMA的AF中继基于协作网络的新型资源分配

在这项工作中,提出了一种新颖的资源分配方案,以在结合了时间切换和功率分配协议的SWIPT辅助非正交多址(NOMA)中继网络中找到最佳的时间切换和功率分配因子。系统模型由一个源节点组成,该源节点在瑞利平坦衰落信道环境中通过放大和转发能量收集中继节点向远近用户广播多路复用NOMA信号。在此,将近和远用户的有效SNR最大化公式化为总发射功率约束下的优化问题,并针对此问题采用了拉格朗日乘数法和差分进化算法。此外,针对不同目标速率,中继位置和信道条件影响下的中断概率,提出了将提议的方案与固定分配方案进行比较的性能研究。最后,仿真结果表明,在固定的时间和功率分配因子上,采用所提出的方案获得的最优值可以改善系统的性能。

更新日期:2021-02-21
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