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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.
In order to improve the antiband interference performance of differential frequency hopping system, a noise normalized and combined differential frequency hopping receiver model is proposed. Two kinds of differential frequency hopping (FHF) signal detection methods are analyzed for symbol by symbol and sequence. Part of frequency bands Interference and background thermal noise.The numerical and simulation results show that the performance of the noise normalized combined differential frequency hopping receiver is better than the conventional differential frequency hopping receiver in the performance of anti-jamming. The worst part of the receiver frequency band The interference is full-band interference, which is much better than that of conventional differential frequency hopping receiver in the range of signal-to-interference ratio where the receiver performance is still very high under the worst-case frequency band interference. When the interference bandwidth is narrowed, the system performance advantage is more significant .