Partial band noise jamming rejection with S-CFFH/16-QAM optimum and suboptimum maximum-likelihood receivers over rayleigh fading channels with imperfect CSI

The recently proposed subset-based coherent fast frequency hopping (S-CFFH) scheme enables reliable channel estimation for FFH over fading channel. With S-CFFH/16-QAM, we propose the optimum and suboptimum maximum-likelihood (ML) receivers in the presence of partial band noise jamming (PBNJ), frequency-selective Rayleigh fading, and Gaussian channel estimation errors. We analyze the bit error ratio (BER) of the suboptimum ML receiver, whose BER performance is nearly the same as the optimum ML receiver. The analyses are verified by simulations. It is shown that, the proposed ML receivers significantly outperform the maximum ratio combining (MRC) and the equal gain combining (EGC). Furthermore, as compared with the conventional non-coherent FFH/BFSK, the S-CFFH/16- QAM shows better BER performance and a much higher spectral efficiency.