中文摘要：

反相对称调制（PISM）与普通双边带（DSB）调制相结合可以在同一载频上同时传输两路不同的信号,而在接收端采用两种解调方法可以分别接收到这两路不同的信号.将这一方法用于实际通信系统中会使信道利用率提高一倍.另外,PISM-DSB对他台干扰也有一定的抑制作用.论述了这一方法的基本原理,并对它进行了计算机仿真,得到了满意的结果.

英文摘要：

Two signals can be transmitted simultaneously on the same carrier frequency if PISM （phase-inversion symmetric modulation） and DSB （double-side-band） are combined in the communication system, and adopting two modulator approaches can receive the two different signals respectively on the receiving end. The application of this method in the real communication system can make the utilization ratio of the channel be doubled. And the PISM-DSB also can restrain the interference of the other stations. This paper discusses the basic principle of PISM-DSB, and makes computer simulation for it and obtains the satisfied results.