Uncoded performance analysis of coherent MFSK signals in wireless fading channels

In this paper, we analyze the error performance of coherent M-ary FSK (MFSK ) signals using the union bound which is an upper bound on the bit error pr obability over frequency-nonselective slow Nakagami and Rician fading chann els with additive white Gaussian noise (AWGN), respectively. Furthermore, t he performances of uncoded coherent and noncoherent signals are compared un der the fading channels. The error probability of noncoherent MFSK signals over slow and flat fading channels when AWGN is present can be derived and evaluated From the new probability density function (PDF) for the envelope of the received signals.