基于SWIPT中继系统的信道容量性能分析

Performance Analysis of Channel Capacity Based on Relay System of SWIPT

在5G时代,无线携能通信(SWIPT)受到人们的广泛关注。本文在仅接收端知道信道状态信息(CSI)、收发两端均知道CSI两种情况下,分析了SWIPT中继系统的不同定义下的系统容量,设计了源端到目的端,源端到中继再到目的的两条路径的系统模型,将模型与SWIPT技术相结合。首先提出了综合信道条件给出了系统瞬时接收信噪比和不同类型的容量公式。其次对比了接收端已知CSI下的遍历容量和带中断概率的信道容量,通过预设不同的门限值对带中断概率的信道容量进行性能分析。随后,通过调整信道情况进行最大中断容量的门限值分析。最后,使用蒙特卡罗法进行数据仿真,得到遍历容量,注水功控法分配功率下的香农容量,最大中断容量和零中断容量的性能对比。仿真结果表明,在瑞利衰落下,利用SWIPT技术可以提高能量利用率和系统容量。

Simultaneous Wireless Information and Power Transfer(SWIPT)has attracted extensive attention by people in the era of 5G.This paper analyzes the system capacity of SWIPT relay system under different definitions when only the receiver knows the channel state information(CSI)and both the transmitter and the receiver know CSI.This paper designs a system model of source to destination and source to relay and then to destination,which combines with SWIPT technology.Firstly,the synthetic channel condition is proposed,and the instantaneous received signal-to-noise ratio and capacity formula of different type are given.Secondly,the ergodic capacity and capacity with outage are compared when CSI is known at the receiver,and the performance of the capacity with outage is analyzed by setting different thresholds.Subsequently,the threshold value of maximum outage capacity is analyzed by adjusting the channel condition.Finally,by using the Monte Carlo method to simulate the data with computer,the performance comparison of ergodic capacity was obtained,shannon capacity was got by the power adaptation policy named as water-filling,maximum outage capacity and zero-outage capacity.Computer simulation results show that SWIPT technology can improve the efficiency of utilizing energy and capacity of system in Rayleigh fading environment.