Anti-Jam Performance of Fast Frequency Hopped MFSK with Coding against Worst-Case Multitone Jamming

Fast frequency hopped (FFH) MFSK with coding can significantly improve anti-jam (AJ) performance against partial band jamming. Multitone (MT) jamming has been shown to be the most effective partial band jamming technique, particularly against higher order M-ary FSK modulation. The results of many jamming analyses performed on FFH MFSK against worst-case MT jamming differ due to simplifying assumptions and to the use of different analytical techniques. To resolve discrepancies in the analytic results, a digital simulation of a demodulator and a Viterbi decoder was developed, yielding a more accurate characterization of the nonlinearities in the demodulator, the soft decision decoding metrics, and the jammer tone configuration. Results for a specific 8-ary FSK with a rate ¿ and k = 7 convolutional code implementation are presented.