IMPLEMENTATION OF A DS-SPREADSPECTRUMINTERCEPTRECEIVERWITHAN ADAPTIVENARROW-BAND INTERFERENCEEXCISERUSINGTRANSFORMDOMAINPROCESSINGAND TIM1E WEIGHTING JohnGevargizandP. Das Elec.,Comp.andSys.Engrg.Dept. RensselaerPolytechnicInstitute
L. B. Milstein · 1986
Thispaperdescribesdetectionof DS-BPSK signalsin thepresenceof narrowbandinterference (CW)wheretransformdomainprocessing is employed fordetectionandexcisionof thenarrowband interference.Thereceiverrejectstheinterferenceby performinga real-timeFouriertransformationfollowedby trackingand excision.This, in turn,is followedby inversetransformation andenergydetection.To furtherimprovethe narrowbandinterferenceexcision,thereceived signalis timeweighted.Usingweighting togetherwithexcision,one obtainsabout12 dB additional reductionof theinterference power at theoutputof thereceiveroverandabove whatonewouldachieveby usingthesystem withoutweighting.