On the symbiotic nature of key antijamming and antiscintillation functions for MFSK and DPSK channels

The relationships between the detector, diversity combiner, and soft-decision generator are unique in the way they contribute to providing the antijamming (AJ) and antiscintillation (AS) capability. The primary focus of this work is on describing this symbiotic relationship. This is done with an approach that permits possible architectures for detection, diversity combining, and soft-decision generation to surface as the secondary focus. The soft-decision generators for DPSK (differential-phase-shift keying) and MFSK (M -ary frequency-shift keying) channels are discussed in detail, because such generators present a variety of implementation problems related to automatic gain control and jamming sensitivity