摘要
推导了在脉冲干扰下无人机扩频遥测系统的误码率公式。提出了用吉尔伯特信道 ( Gi信道 )描述脉冲干扰下无交错编码的扩频系统的信道 ,用离散无记忆信道 ( DMC)描述脉冲干扰下的有交错扩频系统的信道。对比分析了脉冲干扰下的扩频系统采用 FEC前向纠错和不采用 FEC,以及采用 FEC与交错技术相结合3种情况时的系统误码率性能。最后通过数值计算分析 ,得到了一些有用的结论。
On off noise jamming is one of the most effective counterplots for spread spectrum (SS) systems. A common formula of the bit error rate of SS systems under on off jamming is given. In the presence of on off jamming, the coded SS telemetry system without interleaving can be described as a Gilbert channel model, while the coded SS telemetry system with interleaving as a DMC model. The performance of a combined coding and interleaving SS telemetry system is compared with that of a non coded and non interleaved system, as well as of a non interleaved but coded system. Analysis and numerical calculation results show that this combined coding and interleaving technology can greatly improve the performance of SS telemetry systems under on off jamming. Besides, these formulas and results also adapt to partial band jamming.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2001年第B06期38-42,共5页
Acta Aeronautica et Astronautica Sinica
