Abstract:

The conventional slow-hopping-rate frequency-hopping/frequency-shift-keying (FH/FSK) is threatened by follower jamming (FJ). On the other hand, the differential frequency hopping (DFH) can resist FJ efficiently, but its bit error rate rises significantly under partial band jamming (PBJ). To enhance the FJ rejection capability of the slow-hopping-rate FH/FSK without the expense of PBJ rejection capability, the proposed multi-sequence frequency hopping (MSFH) mode makes the data channel and the complementary channel hop on their respective frequency sequences, which will lure the follower jammer out of aiming at the complementary channel, thus mitigating the effect of FJ. Besides, the narrowband front end is employed in the MSFH receiver, which will resist PBJ more efficiently than the wide-band receiver of DFH. In the Rayleigh fading channel, the anti-jamming performance of the convolutional coded MSFH is evaluated. Numerical and simulation results show that, the MSFH generally outperforms FH/FSK by 5~10 dB when under the worst-case FJ, and also outperforms DFH notably when under PBJ.