基于GSM-MBM的无线携能协作系统性能分析

Performance Analysis of GSM-MBM Based Wireless Energy Harvesting Cooperative System

为了提高无线携能(SWIPT)空间调制协作系统的信息传输效率,对系统中继端信号处理方式进行了改进,提出了基于广义空间媒介调制(GSM-MBM)的无线携能协作系统.在中继处激活多根天线,并在天线附近安装射频镜,通过激活不同射频镜的方式构建不同信道路径,以此来携带额外的信息比特.通过理论推导出系统传输效率、平均成对错误概率和能耗增益,并进行了蒙特卡罗仿真.仿真结果显示,与单输入多输出媒介索引调制-SWIPT、基于媒介空间调制-SWIPT系统相比,新方案不仅提高了传输效率,而且还降低了误码率和能耗;与空间调制-SWIPT系统相比,在相同传输效率下误码率略高,但所需的发射天线数大幅度降低,从而降低了系统实现的复杂性和成本.

To improve the efficiency in information transmission of the wireless energy harvesting(SWIPT)spatial modulation cooperative system,an improved signal processing method of the system relay is discussed and a wireless energy harvesting system based on generalized spatial modulation-media based modulation(GSM-MBM)is proposed accordingly.In the system,radio frequency mirrors are placed around transmit antenna elements to create distinct channel perturbations,which is specifically referred to as mirror activation patterns to carry additional information bits.Specifically,the system transmission rate and the average pairwise error probability and energy consumption gain are derived and the accuracy of the analytical derivations is verified by Monte Carlo simulations.The results show that in the proposed scheme,not only the transmission rate is improved,but also the bit error rate and energy consumption are decreased compared with single input multiple output-media based modulation-SWIPT,spatial modulation-media based modulation-SWIPT.The bit error rate is slightly higher that of the spatial modulation-SWIPT system under the same transmission rate.However,the required number of transmit antennas is largely reduced,so that the hardware complexity,form factor and cost are reduced.