反相对称调制(PISM)通信方法初探

Probe into the Phase Inversion Symmetrical Modulation (PISM) Based Communication

反相对称调制法(PISM)能有效降低接收机的噪声,能将淹没在噪声中的信号检测出来。反相对称调制法和其他降噪声方法的本质区别在于:利用窄带噪声包络间的相关性,对信号和噪声同时处理,尤其侧重于对噪声的处理。通过采用MATLAB对时分复用下反相对称—单边带(PIS—SSB)制式进行抗噪声性能的系统仿真,证实了这种新方法能够用较少的设备实现输出信噪比(SNR)的大幅度改善。

The PISM, which can reduce the noise of the receiver effectively, can detect the signal drowned in the noise. The essential distinctions between PISM and other noise reducing methods are： utilizing the correlation of narrow band noise envdope modulation, treating the signal and the noise simultaneously and laying stress on the treatment of the noise. The systematic emulation of anti-noise performance has been made for the phase inversion symmetry-single side band （PIS-SSB） modular under the time division multiplexing through adopting MATLAB, which verifies that this new method can improve the signal-to-noise ratio （SNR）of the output greatly with less equipment.