中文摘要：

反相对称调制（PISM）与普通双边带（DSB）调制相结合可在同一载频上同时传输2路不同的信号，而在接收端采用2种解调方法可以分别接收到这2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1倍。另外PISM—DSB对它台干扰也有一定的抑制作用。本文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 Phase-Inversion Symmetric Modulation and DSB are combined in communication system. But they can be separated in the sink if two demodulations are used. The using of channel may be improved to double. Also the system of PISM - DSB can restrain the interference of others. The paper discusses the theory of PISM- DSB. We are satisfied with the simulations that have been made for it.