Abstract:

On off noise jamming is one of the most effective counterplots for spread spectrum (SS) systems. A common formula of the bit error rate of SS systems under on off jamming is given. In the presence of on off jamming, the coded SS telemetry system without interleaving can be described as a Gilbert channel model, while the coded SS telemetry system with interleaving as a DMC model. The performance of a combined coding and interleaving SS telemetry system is compared with that of a non coded and non interleaved system, as well as of a non interleaved but coded system. Analysis and numerical calculation results show that this combined coding and interleaving technology can greatly improve the performance of SS telemetry systems under on off jamming. Besides, these formulas and results also adapt to partial band jamming.

Key words: spr ead spectrum, on-off jamming, err or cor rection coding, inter leaving, bit er ror r ate