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Designing a Multiple Access Differential Frequency Hopping System with Variable Frequency Transition Function

Spread spectrum communication systems were, appeared as a result of increasing security requirements, and demands of users for multiple access (Peterson et al., 1995). Differential frequency hopping (DFH) was proposed in (Herrick and Lee, 1996) as a multiple access spread spectrum system that simultaneously provides anti-jammer, low probability of intercept properties and also allows, conferencing with high data rate (Mills et al., 2003). In this paper, we explain briefly why such multiple access DFH method is not appropriate practically and also it suffers from lack of required security. Then, we propose a simple multiple access DFH by which users may transmit messages to receiver reliably. Also, receiver needs less processing computations and memory spaces to track users simultaneously.