摘要
在同步解调中,本地载波的频率和相位必须与发送端载波同步,当本地载波存在频率或相位误差时,会使解调输出信号产生失真。以双边带调幅(DSB)信号和单边带调幅(SSB)信号为例,采取定量分析的方法,详细讨论了频率误差和相位误差所产生的失真问题,通过对它们的失真进行比较与分析,得出了一条重要结论:频率误差和相位误差在DSB中所产生的失真比在SSB中更为严重。
In synchronous demodulation, frequency and phase of a local carrier must be synchronous with sending station, distortion will be caused in output signals of demodulation as frequency error and phase error occur in the local carrier. By taking double side band amplitude modulation (DSB) and single side band amplitude modulation (SSB) as examples, the problems of distortion resulted from frequency error and phase error are discussed in detail with a quantitative analysis, through distortion contrast between them, an important conclusion that the distortion caused by frequency error and phase error is more serious in DSB than in SSB is reached.
出处
《江汉石油学院学报》
EI
CSCD
北大核心
2003年第3期131-132,共2页
Journal of Jianghan Petroleum Institute
关键词
同步解调
本地载波
频率误差
相位误差
失真
synchronous demodulation
local carrier
frequency error
phase error
distortion
