《数据通信》系统设计 - 用System - View仿真实现2PSK解析

图20 2PSK含误码率检测模拟调制与相干解调系统组成

图20 2PSK含误码率检测组成

图符23前面连接原PN序列，设定延迟时间为一个码元长度（Delay = 50.e-6 sec）

图符参数设定如下： (Token 23) (Token 24) Operator: Delay Comm: BER Rate Interpolating Delay = 50.e-6 sec Output 0 = Delay t25 Output 1 = Delay - dT No. Trials = 500 bits Threshold = 500.e-3 v Offset = 10.e-9 sec Output 0 = BER t30 Output 1 = Cumulative Avg t28 Output 2 = Total Errors Rate = 400e+3 Hz Gain = -8 dB Gain Units = dB Power Global Link Active Action = Go To Next Loop Memory = Retain all samples Threshold = 500.e-3 Input from t24 Output Port 0 (Token 25、26) Operator: ReSample (Token 29) Operator: Gain (Token 30) Sink: Cndtnl Stop 误码率曲线如下图：