摘要
Abstract
In the differential frequency hopping (DFH),the frequency selection in one hop is constrained by bits blocks in an actually loose way. To solve this,a novel convolutional-coded multi-sequence frequency hopping(CC-MSFH)system was proposed. In CC-MSFH,there is also no need to modulate the transmitted signal. A coded bits block of length N selected one hopping pattern from a bunch of 2N orthogonal hopping patterns,and a sinusoidal wave at the current frequency of the selected pattern is transmitted directly. By this means signals of CC-MSFH maintained robustness as of DFH, while frequency selection in CC-MSFH is additionally constrained more tightly by the hopping patterns. Hereby a narrow band receiver is applicable,so the system can be simplified and reject the out-band jamming more efficiently. Calculation and analysis indicates that CC-MSFH can rejected the partial-band jamming efficiently over Rayleigh fading channels. It has a significantly lower BER than DFH under low SJR.关键词
多序列跳频/卷积码/Viterbi译码/瑞利衰落信道/部分频带干扰Key words
multi-sequence frequency hopping/convolutional code/viterbi decoding/rayleigh fading channel/partial-band jamming分类
信息技术与安全科学
