Optimum jamming effects on frequency-hopping M-ary FSK (Frequency-Shift Keying) systems under certain ECCM (Electronic counter-countermeasures) receiver design strategies

The performance of M-ary frequency-shift-keying frequency-hopping systems using multiple hops per symbol waveform is derived and evaluated for the cases of worst-case partial-band noise jamming and worst-case partial-band tone jamming. The analyses include the effects of the jamming under certain ECCM receiver design strategies. The receiver design strategies include the convention square-law linear combiner and the several types of unconventional nonlinear combiners. The ECCM receiver design employing the nonlinear combiners are found to provide diversity gains whereas such gains are not realized under the conventional linear combining strategy.