Optimum diversity and coding for frequency-hopped multiple access spread-spectrum communication over Rayleigh faded channel subject to pulse-burst jamming

This paper presents the results of using optimum diversity and coding over a Raleigh faded frequency-hopped multiple access communication system subject to pulse-burst lamming with infinite power. Empirical relations are obtained for the required bandwidth expansion and maximum number of users as a function of the jammer duty cycle. It is particularly shown that codes must be carefully chosen to match the channel for various values of the jammer duty cycle. The maximum number of users must be severely reduced as the jammer duty cycle increases to allow for coding redundancy. Two modes of operations are suggested for such systems in which a single user or multiple users are given access, depending on the jamming state of the channel