THEPERFORMANCE OFDIRECT-SEQUENCE SYSTEMS INTHEPRESENCE OFJAMMERS*
Christian Weber, Gaylord K. Huth · 1982
Anenumeration ofthetypesofinterference per- tinent todirect-sequence systems isgiven.The candidates arecategorized asnarrowband orwide- band.Theperformance ofdirect-sequence (DS) sys- temsinthepresence ofa variety oftypesofin- terference isalsopresented. Whenthejammer has achoiceofparameters, theoptimal valueisthen determined. INTRODUCTION DSspreading inconjunction withPSKdatamodu- lation isperhaps themostcommonspread spectrum approach usedinpractice andiscertainly the mostfrequently analyzed. TheDStechnique is general anditsuseisnotlimited toanyparticu- larmodulation technique. Although NRZcoding of bothdataandDScodesisassumed, anyothercom- patible combination ofpossible formats canbe usedinpractice. Theperformance results pre- sented herecanbeextended ina straightforward manner toothermodulation techniques, datafor- matsandcodeformats. Thereceiver ina DSsystem mustacquire and track theDScode,generally before carrier track- inganddatademodulation takeplace.Weassume thatacquisition hasbeenaccomplished andtheDS receiver isoperating inthetrackmode. Weconsider theDSspread spectrum systemper- formance without coding inthepresence ofa vari- etyoftypesofinterference. Anenumeration of thetypesofinterference pertinent toDSsystems isgivenbelow.