Abstract
Fast frequency hopping (FFH) is commonly used as an antijamming communication method. In this paper, we propose efficient adaptive jamming suppression schemes for binary phase shift keying (BPSK) based coherent FFH system, namely, weighted equal gain combining (W-EGC) with the optimum and suboptimum weighting coefficient. We analyze the bit error ratio (BER) of EGC and W-EGC receivers with partial band noise jamming (PBNJ), frequency selective Rayleigh fading, and channel estimation errors. Particularly, closed-form BER expressions are presented with diversity order two. Our analysis is verified by simulations. It is shown that W-EGC receivers significantly outperform EGC. As compared to the maximum likelihood (ML) receiver in conventional noncoherent frequency shift keying (FSK) based FFH, coherent FFH/BPSK W-EGC receivers also show significant advantages in terms of BER. Moreover, W-EGC receivers greatly reduce the hostile jammers’ jamming efficiency.
Highlights
As a powerful antijamming method, fast frequency hopping (FFH) is widely used in military applications
In the presence of jamming, various diversity combining schemes have been proposed for noncoherent frequency shift keying (FSK) based FFH, including maximum likelihood (ML) combining [1,2,3,4,5,6,7], FFT based combining schemes [8], linear combining (LC) [9], self-normalization combining [10], noise-normalization combining [11], product combining [12,13,14,15,16,17], and clipped combining [18, 19]
We extended the study of [20] to the Rayleigh fading channels with imperfect channel state information (CSI) [22], where we analyzed the bit error ratio (BER) of FFH/binary phase shift keying (BPSK) with maximum ratio combining (MRC) and equal gain combining (EGC)
Summary
As a powerful antijamming method, fast frequency hopping (FFH) is widely used in military applications. In the presence of jamming, various diversity combining schemes have been proposed for noncoherent frequency shift keying (FSK) based FFH, including maximum likelihood (ML) combining [1,2,3,4,5,6,7], FFT based combining schemes [8], linear combining (LC) [9], self-normalization combining [10], noise-normalization combining [11], product combining [12,13,14,15,16,17], and clipped combining [18, 19]. Among the noncoherent FFH/FSK combining schemes, ML combining yields the best BER performance in the presence of jamming. Kang and Teh [20] studied the bit error ratio (BER) of coherent FFH/BPSK with partial band noise jamming (PBNJ) and AWGN channel. The authors considered coherent ML combining, LC combining, and harddecision majority-vote combining, which significantly outperform various noncoherent FFH/FSK diversity combining schemes in terms of BER. W-EGC receivers reduce the hostile jammer’s efficiency, by forcing the jammer to take full-band jamming to achieve the worst case jamming
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