Performance of diversity combining and coding for DS/DPSK over a worst case pulse jammed multipath-fading channel

The effectiveness of antenna and spread-spectrum diversity is evaluated for DS/DPSK (direct sequence/differential phase-shift keying) signaling over a worst-case pulse-jammed multipath-fading channel. Two diversity combining techniques are proposed. One uses predetection selective combining followed by postdetection equal gain combining, and the other uses postdetection equal gain combining only. The use of coding with hard and soft decision decoding is also considered. It is shown that the proposed diversity techniques can provide a significant improvement in the performance of coded antijam systems operating over jammed multipath-fading channels