{"title":"Spread spectrum signals with low probability of chip rate detection","authors":"D. Reed, M. Wickert","doi":"10.1109/MILCOM.1988.13428","DOIUrl":null,"url":null,"abstract":"Spread spectrum signals are considered which use spreading codes chosen to give a low probability of chip rate detection. Pulse shaping and pseudorandom amplitude weighting are used to defeat the interceptor who uses a nonlinear circuit to generate a tone at the chip rate. It is shown that a combination of these techniques can, ideally, defeat any such circuit. The use of quantized multilevel symbols is shown to give performance approaching that of Gaussian symbols. A four-level symbol set is shown to be able to defeat quadratic and fourth-power circuits.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"23","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"军事通信技术","FirstCategoryId":"1093","ListUrlMain":"https://doi.org/10.1109/MILCOM.1988.13428","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 23
Abstract
Spread spectrum signals are considered which use spreading codes chosen to give a low probability of chip rate detection. Pulse shaping and pseudorandom amplitude weighting are used to defeat the interceptor who uses a nonlinear circuit to generate a tone at the chip rate. It is shown that a combination of these techniques can, ideally, defeat any such circuit. The use of quantized multilevel symbols is shown to give performance approaching that of Gaussian symbols. A four-level symbol set is shown to be able to defeat quadratic and fourth-power circuits.<>