Statistic characteristics of M-ary FSK signal in the presence of Gaussian noise, intersymbol interference and Rayleigh fading

In this paper the receiver for the demodulation of M-FSK signals in the presence of Gaussian noise, intersymbol interference and Rayleigh fading is considered. The influence of the Gaussian noise, intersymbol iterference and Rayleigh fading to the communication systems can seriously degrade their performance.