Abstract
Spread Spectrum has been the topic of study and research in military communication circles for decades. For military purposes, it is used for jamming, anti-jamming, anti-interference and high resolution ranging.There is a growing interest in utilizing spread spectrum systems for civilian applications such as mobile radio communication, packet radio, radio telephony, amateur radio, universal timing, and some specialized application in satellites.Two important techniques are of interest; direct sequence spread spectrum and frequency hopping spread spectrum. These two techniques will produce some interference with conventional amplitude modulation (AM) and frequency modulation (FM) systems. Therefore, one can consider four interference cases: (1) Direct sequence interferences to AM systems. (2) Direct sequence interference to FM systems. (3) Frequency hopping interference to AM systems. (4) Frequency hopping interference to FM systems. Frequency hopping interference to FM systems is going to be the worst case.Therefore, the mathematical modeling and simulation of frequency hopping interference to FM systems is considered in this study. The idea of interleaving and overlaying is defined and proposed for solving this interference problem.
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