无线衰落信道模拟方法及仪器研制  

Simulation method for fading channel and emulator development

作　　者：周生奎[1] 戴秀超 朱秋明[1,2] 刘星麟[1] 廖志忠 

机构地区：[1]南京航空航天大学雷达成像与微波光子技术教育部重点实验室,南京210016 [2]中国空空导弹研究院,洛阳471009

出　　处：《电子测量与仪器学报》2015年第7期988-994,共7页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(基金号61172077);航空科学基金(基金号20120152001);中国博士后科学基金(2013M5416614);中央高校基本科研业务费青年科技创新基金(NS2015046)资助项目

摘　　要：信道模拟器是近年来无线通信系统测试与性能评估中的新型测量仪器,研究了包含路径损耗、阴影衰落、多径衰落和信道噪声多种因素的无线信道模型,提出了一种基于谐波叠加原理且易于硬件实现的复合衰落信道实时模拟方法,并据此研制了中频信道模拟器原理样机。实测和分析结果表明,模拟器输出信道衰落分布与理论值非常吻合,统计方差的相对偏差约为0.06%,而自相关特性和多普勒功率谱也均与设计值吻合,可用于实验室模拟真实传播环境对无线信号的随机失真影响。Channel emulator is a novel instrument for wireless communication system test and performance evaluation. Firstly,the statistical channel model is studied,which includes propagation path loss,shadow fading,multipath fading and channel noise. Then,a new real-time generation method for composite fading channel based on sum of sinusoids( So S) theory is presented,which is easy to realization for hardware. Based on the proposed method,a prototype of channel emulator on intermediate frequency band is developed. The results of experimental tests and statistical analysis show that the output fading envelope distribution is very close to the theoretical one and the average relative difference is about 0. 06%. The auto-correlation characteristic and Doppler power spectrum of output fading also agree well with the theoretical ones. So it can be used to simulate the random distortion on the propagation signals caused by real environment in the lab.

关 键 词：信道模型 信道模拟器 多径阴影衰落 谐波叠加 

分 类 号：TN92[电子电信—通信与信息系统]