Performance analysis of FFH-FDMA satellite communication system using partial processing Dehop-Rehop Transponder (DRT) under jamming

This paper presents simulation results which illustrate the performance of a fast frequency hopped - frequency division multiple access (FFH-FDMA) satellite communication system using a partial processing dehop-rehop transponder (DRT) under jamming. In the simulated system, convolutional coded symbols (using rates 1/2 or 1/4) are hopped with time diversity to enhance the anti-jamming (AJ) capacity. This study examines the combined effect of time diversity and channel coding under the influence of TWTA nonlinearity, jammer strength and up/down link channel noises on the end-to-end bit error rate (BER) of the DRT system. The simulated results show that under the considered jamming environments of partial band noise jamming (PBNJ) and band multi-tone jamming (BMTJ), excessive TWTA input back-off (IBOF) does not necessarily enhance the performance; rather, it greatly degrades the BER, particularly when channel noise is non-negligible. It was also verified that under the same conditions, time diversity and convolutional coding must be carefully combined to avoid possible degradation in FH-FDMA satellite channel.