射频接收机非线性对分集与复用影响分析  

Effect analysis of diversity and multiplexing on nonlinearity RF receiver

作　　者：刘锡国 刘敏 赵志勇 刘传辉 张磊 LIU Xiguo;LIU Min;ZHAO Zhiyong;LIU Chuanhui;ZHANG Lei(Aviation Communication Teaching and Research Section,Naval Aeronautic University,Yantai 264001,China;State Key Laboratory of Signal and Information Processing of Shandong Province,Yantai 264001,China)

机构地区：[1]海军航空大学航空通信教研室,烟台264001 [2]信号与信息系统山东省重点实验室,烟台264001

出　　处：《电波科学学报》2022年第2期328-333,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(61701518);信号与信息系统山东省重点实验室经费资助项目。

摘　　要：分别从分单输入单输出系统(single-input single-output,SISO)与多输入多输出系统(multiple-input multiple-output,MIMO)研究了多天线系统中射频接收机非线性对通信系统性能的影响规律,发现原有对非线性分集与复用折中的定义不再适用于考虑射频接收机非线性情况,并给出了适用于考虑射频接收机非线性情况的新定义.通过复合信道建模推导了非理想情况下分集增益的定义和中断概率表达式,仿真了考虑射频接收机非线性时多天线系统分集增益与复用增益关系曲线,得出了考虑分集与复用折中时目标速率的增长规律.理论和仿真表明,传统的分集增益和复用增益的定义并不适用于考虑接收机非线性的实际情况,SISO系统中射频接收机非线性对分集与复用的折中影响与理想情况一样,MIMO系统中需要对原有的分集增益和复用增益进行修正才能得到分集与复用的最优折中.In order to analyze the influence of the nonlinearity of the radio frequency receiver in the multi-antenna system on the performance of the multi-antenna communication system,we study the single-input single-output(SISO)and multiple-input multiple-output(MIMO)systems.After the research,it is pointed out that the original definition of the compromise between nonlinear diversity and multiplexing is no longer applicable when considering the nonlinearity of radio frequency receivers,and the applicable definition and its physical meanings are given.Through composite channel modeling,the definition of diversity gain and the expression of outage probability under non-ideal conditions are theoretically deduced,and the relationship curve between diversity gain and multiplexing gain of multi-antenna system considering the nonlinearity of radio frequency receiver is obtained by simulation,and the relationship between diversity gain and multiplexing gain is obtained.The growth law of the target rate in the compromise with reuse.Theory and simulation show that the traditional definitions of diversity gain and multiplexing gain are not suitable for the actual situation of considering the nonlinearity of the receiver,and the compromise effect of the nonlinearity of the RF receiver in the SISO system on the diversity and multiplexing is the same as the ideal situation;in the MIMO system,the original diversity gain and multiplexing gain need to be modified to obtain the optimal compromise between diversity and multiplexing.

关 键 词：多天线系统 射频接收机 非线性 分集 复用 

分 类 号：TN9143[电子电信—通信与信息系统] TN83[电子电信—信息与通信工程]