M-FSK signal recognition in fading channels for cognitive radio

This paper proposes a novel algorithm for the recognition of M-ary frequency shift keying (M-FSK) signals in fading channels. By using the number and position of the first-order cycle frequencies (CFs), requirements for the recovery of carrier, waveform, and symbol timing information, and the estimation of signal and noise power are avoided. Furthermore, receive spatial diversity can be utilized to enhance the signal recognition performance. The effectiveness of the algorithm is shown through simulations.