NNC-DFH接收机抗部分频带干扰性能分析

Performance analysis of antijamming of partial-band in NNC-DFH receivers

为改善差分跳频系统的抗部分频带干扰性能,提出了一种噪声归一化合并差分跳频接收机模型,并针对逐符号检测和序列检测2种差分跳频信号检测方法,分析了部分频带干扰及背景热噪声下系统的误符号性能.数值和仿真结果表明:噪声归一化合并差分跳频接收机的抗部分频带干扰性能优于常规差分跳频接收机;接收机的最坏部分频带干扰为全频带干扰,在最坏部分频带干扰下,接收机性能仍在很大的信干比区间内大幅优于常规差分跳频接收机,当干扰带宽变窄时,系统性能优势更为显著.

To improve the rejecting partial-band noise jamming （PBNJ） performance of differential fre- quency hopping （DFH） systems, a NNC （noise-normalization combing）-DFH receiver model was put forward. Symbol error rate performance of this receiver employing both symbol-by-symbol detection and sequence detection were analyzed respectively under partial-band jamming with background ther- mal noise considered. Numerical and simulation results show that NNC-DFH receiver is superior to conventional DFH receiver in rejecting. The worst-case partial-band jamming to this receiver is full- band jamming and there is still remarkable performance improvement for a large range of signal to jamming ratio when this receiver and conventional receiver are all worst-case jammed. Performance improvement gets more significant with the reduction of jamming signal bandwidth.