卷积编码多序列跳频及抗部分频带干扰性能分析  

Convolutional-Coded Multi-Sequence Frequency Hopping System and Performance under Partial-Band Jamming

作　　者：赵寰[1] 全厚德[1] 张弛[1] 

机构地区：[1]军械工程学院,石家庄050003

出　　处：《火力与指挥控制》2014年第7期68-72,共5页Fire Control & Command Control

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.

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 

分 类 号：TN92[电子电信—通信与信息系统]