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.
出处
《电子测量与仪器学报》
CSCD
2009年第S1期4-9,共6页
Journal of Electronic Measurement and Instrumentation
关键词
非理想
通道
矢量误差幅度
失真
频谱
non-ideal
channel
EVM
distortion
frequency spectrum
