Wireless Communications Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam.
Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City 700000, Vietnam.
Sensors (Basel). 2018 Oct 17;18(10):3501. doi: 10.3390/s18103501.
Non-orthogonal multiple access (NOMA) and energy harvesting (EH) are combined to introduce a dual-hop wireless sensor system. In particular, this paper considers a novel EH protocol based on time power switching-based relaying (TPSR) architecture for amplify-and-forward (AF) mode. We introduce a novel system model presenting wireless network with impacts of energy harvesting fractions and derive analytical expressions for outage probability and ergodic rate for the information transmission link. It confirmed that the right selection of power allocation for NOMA users can be performed to obtain optimal outage and ergodic capacity performance. Theoretical results show that, in comparison with the conventional solutions, the proposed model can achieve acceptable outage performance for sufficiently small threshold signal to noise ratio (SNR) with condition of controlling time switching fractions and power splitting fractions appropriately in considered TPSR protocol. We also examine the impacts of transmitting power at source, transmission rate, the other key parameters of TPSR to outage, and ergodic performance. Simulation results are presented to corroborate the proposed system.
非正交多址接入（NOMA）和能量收集（EH）相结合，引入了一种双跳无线传感器系统。具体来说，本文考虑了一种新颖的基于时分功率切换中继（TPSR）架构的 EH 协议，用于放大转发（AF）模式。我们引入了一种新的系统模型，提出了具有能量收集分数影响的无线网络，并推导出了信息传输链路的中断概率和遍历速率的解析表达式。结果证实，通过为 NOMA 用户进行适当的功率分配选择，可以获得最优的中断和遍历容量性能。理论结果表明，与传统解决方案相比，在所提出的模型中，通过适当控制 TPSR 协议中的时间切换分数和功率分割分数，可以在足够小的信噪比值（SNR）条件下实现可接受的中断性能。我们还研究了源发射功率、传输速率以及 TPSR 的其他关键参数对中断和遍历性能的影响。给出了仿真结果以验证所提出的系统。
