摘要
本文介绍了2PSK与2DPSK调制解调的基本原理,采用Systemview软件构建2PSK与2DPSK调制解调仿真系统,通过Systemview分析窗口分析接收方载波反相和不反相时信号在这两个仿真系统中的波形变化,直观地显示了2PSK信号的"反相工作"现象和2DPSK信号消除"反相工作"的原因:2DPSK解调输出为2PSK解调输出的差分译码,当接收方载波反相时,2PSK解调输出电平与正常解调输出完全相反("反相工作"现象),但它们电平改变的位置相同,因此通过差分译码后得到的2DPSK的解调输出与正常解调输出相同。
The paper introduces the basic principles of modulation and demodulation for 2PSK and 2DPSK and builds their simulation system on System View. By using the analysis window of System View, we can analyze waveform changes in the two simulation systems when carrier wave is in phase and out of phase, which intuitively show the reason of ＂reverse phase work＂ in 2PSK system and the reason that 2DPSK system can remove ＂reverse phase work ＂ ： The 2DPSK demodulator output is the differential decoding of the 2PSK demodulator output. The 2PSK demodulation output when the receiver carrier out of phase is completely contrary to that when the receiver carrier is in phase（this is ＂reverse phase work＂ in 2PSK）, and their electrical level changes are in the same position. Therefore, after differential decoding of 2PSK demodulator output, 2DPSK demodulation output when the receiver carrier out of phase is as same as that when the receiver carrier is in phase.
出处
《电子设计工程》
2016年第11期78-80,83,共4页
Electronic Design Engineering
