Dual nonlinear diversity combining receiver for fast frequency hopped systems to combat partial-band noise jammer

Error probability analyses are performed for a BFSK system employing L hops/bit frequency-hopped spread-spectrum waveforms transmitted over a partial-band Gaussian noise jamming channel. A novel diversity combining receiver called DNDCR (dual nonliner diversity combining receiver) is presented in this paper. In DNDCR, the envelope detector sample for each dehopped signal is to be weighted by the inverse noise powers and then weighted by a soft-limiter prior to being accumulated in the combiner. The performance comparison under a worst-case partial noise jammer among different diversity combining technologies is given. It shown that a diversity gain for error rate improvement is realizable for dual nonlinear combining receivers.