Luby transform （LT） codes are proposed to suppress the effect of partial band noise jam- ming in frequency hopping （FH） communication systems. A decoding scheme for joint erasures of severely jammed symbols and er...Luby transform （LT） codes are proposed to suppress the effect of partial band noise jam- ming in frequency hopping （FH） communication systems. A decoding scheme for joint erasures of severely jammed symbols and error correction is proposed. If an uncorrectable error is detected, the receiver erases the jammed symbols and uses incremental redundancy to increase the error-correcting capability. The performance of LT codes, under power-oppressive partial band noise jamming （ PB- N J） with the additive white Gaussian noise （AWGN）, is evaluated via simulation. Even if the jam- mer spreads its high power over half of the hopping bandwidth, LT codes are shown to achieve a tar- get bit error probability of 10 -5, demonstrating their effectiveness as high-performance codes to im- prove the ability of FH systems to combat varying partial band noise jamming.展开更多
In this paper,we analyze the bit error ratio(BER) of fast frequency hopping(FFH) system with binary phase shift keying(BPSK) in high-mobility wireless channels.By taking into account partial band noise jamming and cha...In this paper,we analyze the bit error ratio(BER) of fast frequency hopping(FFH) system with binary phase shift keying(BPSK) in high-mobility wireless channels.By taking into account partial band noise jamming and channel estimation errors as Gaussian noise,both of maximal-ratio combining(MRC) and equal-gain combining(EGC) schemes are considered,and exact analytical BER expressions for MRC and EGC schemes are obtained.Especially,a closed-form BER expression for the MRC scheme is also presented in high signal-to-noise ratio region.Analytical and simulation results demonstrate that,the FFH/BPSK schemes suffer from performance degradation in the presence of channel estimation errors.The worst case jamming factor is shown to be inversely proportional to the signal to jamming ratio.With properly designed frequency hopping schemes and channel estimation schemes,the performance improvement is also observed as compared with the traditional noncoherent FFH/BFSK system.展开更多
基金Supported by the National Nature Science Foundation of China(61072048)
文摘Luby transform （LT） codes are proposed to suppress the effect of partial band noise jam- ming in frequency hopping （FH） communication systems. A decoding scheme for joint erasures of severely jammed symbols and error correction is proposed. If an uncorrectable error is detected, the receiver erases the jammed symbols and uses incremental redundancy to increase the error-correcting capability. The performance of LT codes, under power-oppressive partial band noise jamming （ PB- N J） with the additive white Gaussian noise （AWGN）, is evaluated via simulation. Even if the jam- mer spreads its high power over half of the hopping bandwidth, LT codes are shown to achieve a tar- get bit error probability of 10 -5, demonstrating their effectiveness as high-performance codes to im- prove the ability of FH systems to combat varying partial band noise jamming.
基金supported in part by GF Research Program of China(4010103020201-2)Program for New Century Excellent Talents in University(NCET-11-0058)the National Natural Science Foundation of China(61201126 and 61032002)
文摘In this paper,we analyze the bit error ratio(BER) of fast frequency hopping(FFH) system with binary phase shift keying(BPSK) in high-mobility wireless channels.By taking into account partial band noise jamming and channel estimation errors as Gaussian noise,both of maximal-ratio combining(MRC) and equal-gain combining(EGC) schemes are considered,and exact analytical BER expressions for MRC and EGC schemes are obtained.Especially,a closed-form BER expression for the MRC scheme is also presented in high signal-to-noise ratio region.Analytical and simulation results demonstrate that,the FFH/BPSK schemes suffer from performance degradation in the presence of channel estimation errors.The worst case jamming factor is shown to be inversely proportional to the signal to jamming ratio.With properly designed frequency hopping schemes and channel estimation schemes,the performance improvement is also observed as compared with the traditional noncoherent FFH/BFSK system.
