Soft-limiter RAKE receivers for coded DS/DPSK over pulse jammed multipath-fading channels

Two soft-limiter RAKE receivers that use a combination of antenna and multipath diversity are evaluated for direct-sequence differential phase shift keyed (DS/DPSK) signaling over a pulse jammed multipath-fading channel. One receiver uses predetection selective (antenna) combining and postdetection equal gain (multipath) combining, and the other uses postdetection equal gain combining only. In either case. the postdetection diversity combiner output is soft-limited prior to decoding. It is shown that for increasing levels of diversity the soft-limiter becomes more effective, resulting in a receiver performance that approaches a maximum likelihood soft-decision receiver with perfect jammer state information