载波提取环的设计与测量

• 作 者: 田议
• 出 处: 无线电通信技术
• 发表日期: 1981年09期
• 关键词: 载波提取 二倍频 参考信号 调相 作用图 相位误差 信噪比 捕捉带 环路 频偏

一、环路设计(一)载波提取环方案的确定与部件作用图1为载波提取环的方框图,相位参考信号是从接收到的2 PSK信号用二倍频的方法得到的,这样就消除了双向调制,再经二分频就可得到解调用的相干相位参考信号,这个信号将与接收到的调相信号同相或差180°。

First, the loop design (A) carrier extraction loop to determine the program and components Figure 1 is a block diagram of the carrier extraction loop, the phase reference signal is received from the 2 PSK signal obtained by the double frequency method, thus eliminating Bidirectional modulation, and then by the second frequency can be obtained by demodulation of the coherent phase reference signal, the signal will be received with the phase modulation signal in-phase or 180 ° difference.