The effects of jamming on control policies for frequency-hopped slotted ALOHA

A performance analysis of the effects of interference due to jamming on transmission control policies for slotted Aloha with frequency-hopped code division multiple access is presented. Both static and dynamic control schemes are considered. With static control, the transmission probability is fixed, while dynamic control adaptively varies the transmission probabilities as a function of the network backlog as well as the interference level due to jamming. Dynamic control is shown to provide a considerable performance improvement over static control when the interference level is unknown or time varying. Performance is evaluated using both analytical and simulation models. A numerical performance evaluation is given for a network of 250 users and a spread factor (number of hopping positions) of 100 where the other systems parameters are varied.<
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