Frequency hopped spread spectrum systems with Reed Solomon coding and practical jammer state estimation

Abstract

The authors examine the performance of frequency-hopped spread spectrum transmission with Reed Solomon coding, parallel errors and erasures decoding, and with the Viterbi ratio threshold technique used as a practical jammer estimator. The decoded symbol error rate is evaluated under conditions of worst-case partial band noise and worst-case multitone jamming plus background noise. In general, it is found that, with the appropriate choice of threshold for the Viterbi jammer state estimator, most of the substantial performance gains promised by perfect jamming state analysis can be realized. With partial band noise jamming and a signal-to-noise ratio (SNR) of greater than 8 dB, an optimum threshold will bring the performance to within 1 dB of perfect jamming state estimation performance. With multitone jamming and an SNR of 8 dB, the system performance comes within about 3 dB. >