构建DPSK调制与解调电路，并用示波器观察调制与解调前后的信号波形。

Construct DPSK modulation and demodulation circuits and observe the signals’ waveforms before and after modulation and demodulation using an oscilloscope.

第一条是原始的基带信号，第二条为2DPSK信号的波形，第3条为解调后的波形。可以看出第一条和第3条的波形相同，说明了仿真正确。

The first strip is the original baseband signal; the second is the waveform of 2DBSK signal; the third is the waveform after demodulation. It can be seen the first and the third are the same in waveform, thereby the simulation is correct.

图4-15可知，解调后的码元序列与发送的码元序列向比较延时了进两个码元时间，以致后面的两个码元无法在示波器中显示出来。但解调后所得到的码元序列与发送码元序列相比有发生码元的失真，从而得出用Simulink模块所设计的DBPSK解调器符合要求，同时DBPSK的调制波形也和发送码元相吻合，证明整个模型工作正常，满足设计的要求。

From Fig. 4-15 it can be seen that, the sequence of demodulated code-elements delays by approximately two code-element intervals as compared with the emitted sequence of code-elements, such that, the following two code-elements cannot be shown in oscilloscope. But a distortion has occurred to the code-elements in the regained sequence after demodulation compared to the emitted code-elements sequence, thereby it is concluded that the DBPSK demodulator designed by Simulink Module meets the demand, meanwhile the modulation waveform of DBPSK also matches that of the emitted code-elements, which proves that the entire module works in a normal state and meets the designing requirement.