A Suboptimal Maximum-Likelihood Receiver for FFH/BFSK Systems With Multitone Jamming Over Frequency-Selective Rayleigh-Fading Channels

Maximum-likelihood (ML) receivers have been investigated for the fast frequency-hopped binary frequency-shift-keying (FFH/BFSK) spread-spectrum communications system with the worst case of the band multitone jamming and the additive white Gaussian noise over frequency-selective Rayleigh-fading channels. A suboptimal ML diversity-combining receiver has been theoretically analyzed based upon an approximation of the natural logarithm of the modified Bessel function under a correlated two-path frequency-selective channel model. The performance of the receiver compared with that of other diversity-combining receivers, in terms of the bit error rate, has been scrutinized. Computer simulations confirm that our numerical analysis is valid, and the proposed suboptimal ML receiver outperforms other receivers.