直扩MSK通信链路的仿真程序。PN码采用m序列，周期可自行改动。接收端解扩解调同时进行。亲测可用。(Simulation program of DSSS MSK communication link. PN code uses m sequence, the cycle can be changed by itself. Simultaneous demodulation and demodulation are carried out at the receiver. Pro test ava