非理想传输通道对数字调制信号EVM的影响——理论、仿真和测量  

EVM caused by non ideal transmission channel-theory,simulation and measurement

作　　者：周峰[1] 张睿[1] 郭隆庆[1] 王南[1] 

机构地区：[1]工业和信息化部电信研究院信息产业部通信计量中心,北京100191

出　　处：《电子测量与仪器学报》2009年第S1期4-9,共6页Journal of Electronic Measurement and Instrumentation

摘　　要：数字调制信号的非理想传输通道广泛存在,包括一些射频传输线、无线信道,非理想通道导致数字调制信号失真,矢量误差幅度(EVM)是数字调制信号失真的关键指标。本文推导得出了一个新公式,可根据通道的频率响应特性和信号频谱,精确计算出非理想通道导致的EVM值,基于BPSK信号的仿真和测量实验证实了该公式的正确性。非理想通道导致的EVM值不仅是信号失真的指标,也可作为非理想通道对特定信号"损伤"的总体衡量指标,这发展了一种新的通过单一参量评价复杂传输通道的便捷方法。non-ideal channel is common in transmission of digital modulation signal,including wireless channel and RF transmission line.Non-ideal channel causes distortion of signal.Error vector magnitude(EVM) is a key index of distortion for digital modulation signal,if the frequency response of channel and frequency spectrum of signal is known;it's possible to estimate the EVM by an analytical equation this paper proposed.Measurement and simulation based on BPSK signal validates the equation.EVM caused by non-ideal channel is not only a distortion index of signal,but also a distortion index of'channel',so on it,a single value of EVM can evaluate a complex transmission channel.

关 键 词：非理想 通道 矢量误差幅度 失真 频谱 

分 类 号：TN761[电子电信—电路与系统]