多序列跳频系统及其在瑞利衰落信道下性能分析  

Multi-Sequence Frequency Hopping System and its Performance over Rayleigh Fading Channel

作　　者：赵寰[1] 全厚德[1] 崔佩璋[1] 

机构地区：[1]军械工程学院信息工程系,石家庄050003

出　　处：《信号处理》2013年第8期1077-1083,共7页Journal of Signal Processing

基　　金：总装备部军内科研项目([2011]811)

摘　　要：差分跳频中,用户数据对频率选择的约束性比较弱。对此本文提出多序列跳频(MSFH)系统,其发送频率不仅是用户数据的函数,也受同步跳频序列严格约束,因此可以采用窄带接收更好地抑制带外干扰。具体地,数据分组从一簇相互正交的跳频序列中选出一个序列,该序列的当前频率由射频端直接发送,而无需对发送信号进行调制。得到了瑞利衰落信道中,未编码和采用卷积编码-硬/软判决Viterbi译码时MSFH符号误码率性能。计算和仿真表明,在相同编码增益下,MSFH误码率低于常规跳频系统;与差分跳频译码复杂度相当时,MSFH性能亦具有一定优势。In the differential frequency hopping （DFH） system, the frequency selection process was constrained by in-formation data in an actually loose way. To improve this, an innovative frequency hopping scheme, the multi-sequence fre-quency hopping （MSFH） was proposed. In MSFH, the transmitted frequency was constrained not only by the information data, but also strictly by the synchronized hopping patterns. By this means a narrow band receiver was applicable, so the system could reject the out-band jamming more efficiently. Specifically, in MSFH, a bit block selected a hopping pattern from a bunch of orthogonal hopping patterns, and a sinusoidal wave at the current frequency of this pattern was transmitted directly without modulation. The sign error rate （SER） performances of MSFH with no coding and with eonvolutional cod-ing and hard/soft Viterbi decoding were investigated over Rayleigh fading channels. Calculation and simulation indicate that, the MSFH has lower SER versus the conventional FH-2FSK under the same coding gain, and it also outperforms the DFH of a comparable decoding complexity.

关 键 词：多序列跳频 卷积码 VITERBI译码 瑞利衰落信道 

分 类 号：TN92[电子电信—通信与信息系统]