| 摘要: |
| 结合短波差分跳频(DFH)信号的特点，分析了短波信道的多径、时延和多普勒效应对高速跳
频信号的影响，构建了基于Turbo码的G函数模型，并提出采用短时傅里叶变换(STFT)算法和
最大后验概率（MA
P）译码算法相结合的跳检测方法，进行跳频信号的跳检测。仿真结果表明：综合考虑短波
信道影响，采用该方法进行跳频信号检测，信噪比为6.8 dB时，误码率达到10-5，
可实现DFH信号的有效检测。 |
| 关键词: 差分跳频 短波信道 短时傅里叶变换 跳检测 |
| DOI：10.3969/j.issn.1001-893X. |
|
| 基金项目:湖北省教育厅科学研究计划资助项目（D20091503） |
|
| HF DFH Hop-detection Method Based on STFT |
| XIONG Jun-qiao |
| (College of Electrical and Electronic Engineering, Wuhan Institute of Technology
,Wuhan 430073, China) |
| Abstract: |
| According to the characteristic of short-wave or HF(High Frequency) DF
H（Differential Frequency Hopping) signal，the impact of the HF channel with mul
t
ipath, delay and the Doppler on the high-speed FH signal is analysed,the G funct
ion
model based on Turbo codes is established, and a new hop-detection method is pro
posed which combines with STFT(Short Time Fourier Transform) algorithm and maxim
um likelihood (MAP) decoding algorithm for detection of FH signals. The simulati
on results show that the bit error rate(BER) can reach 10-5 when the sig
nal-t
o-noise ratio(SNR) is 6.8 dB,and the effective detection of DFH signal is realiz
ed. |
| Key words: differential frequency hopping（DFH) HF channel short time Fourier transform(STFT) hop-detection |
《电讯技术》编辑部 