摘要
差分跳频(DFH)中用户数据对频率选择的约束性较弱。对此提出一种卷积编码的多序列跳频(CC-MSFH)系统,无需对发送信号进行调制,长度为N的编码数据分组从一簇2N个正交跳频序列中选出某个序列,并在该序列的当前频率上发送单频信号。相比DFH,CC-MSFH保持了信号健壮性,又使发送频率受跳频序列的强约束,因此,可以采用窄带接收来抑制异频干扰。计算和分析表明,在瑞利衰落信道中,CC-MSFH能够有效对抗部分频带干扰,在小信干比下误码率明显低于DFH。
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 S JR.
出处
《火力与指挥控制》
CSCD
北大核心
2014年第7期68-72,共5页
Fire Control & Command Control
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
multi-sequence frequency hopping, convolutional code, viterbi decoding, rayleigh fadingchannel, partial-band jamming
