Li Zhen, Yang Mingchuan, Wang Gang
Communication Research Center, Harbin Institute of Technology, Harbin 150001, China.
Science and Technology on Communication Networks Laboratory, Shijiazhuang 050002, China.
Sensors (Basel). 2021 Jun 23;21(13):4303. doi: 10.3390/s21134303.
In this paper, we investigated the performance of a two-way satellite-terrestrial DF relay network with asymmetric simultaneous wireless information and power transfer (SWIPT). In particular, selective physical-layer network coding (SPNC) was employed in the proposed network, improving the throughput performance. We derived the expressions of system average end-to-end throughput and single node detection (SND) occurrence probability. Furthermore, to observe the effects of the power splitting (PS) coefficient on the energy efficiency performance, the expressions of energy harvested in the physical-layer network coding (PNC) and SPNC protocol were also derived. Finally, theoretical analyses and Monte Carlo simulation results are presented to show: (i) SPNC protocol outperforms the conventional PNC protocol in the two-way satellite-terrestrial relay network with SWIPT in infrequent light shadowing (ILS), average shadowing (AS), and frequent heavy shadowing (FHS) Shadowed-Rician fading channels; (ii) as the channel state gets worse, SPNC protocol can achieve more performance improvement than PNC protocol; (iii) as the PS coefficient increases, the average end-to-end throughput performance increases progressively, and the average energy efficiency performance increases progressively within a certain range, while decreasing in the others.
在本文中，我们研究了具有非对称同时无线信息与功率传输（SWIPT）的双向卫星 - 地面解码转发（DF）中继网络的性能。具体而言，在所提出的网络中采用了选择性物理层网络编码（SPNC），提高了吞吐量性能。我们推导了系统平均端到端吞吐量和单节点检测（SND）发生概率的表达式。此外，为了观察功率分配（PS）系数对能量效率性能的影响，还推导了物理层网络编码（PNC）和SPNC协议中收集到的能量的表达式。最后，给出了理论分析和蒙特卡罗仿真结果，以表明：（i）在具有SWIPT的双向卫星 - 地面中继网络中，在稀疏轻阴影（ILS）、平均阴影（AS）和频繁重阴影（FHS）阴影莱斯衰落信道中，SPNC协议优于传统的PNC协议；（ii）随着信道状态变差，SPNC协议比PNC协议能实现更大的性能提升；（iii）随着PS系数增加，平均端到端吞吐量性能逐渐提高，平均能量效率性能在一定范围内逐渐提高，而在其他范围内降低。
