基于滑动截获和信号相关的对流层散射频谱感知

米新平; 陈西宏; 刘强; 曹宇飞; 张爽; 宋新成

doi:10.13700/j.bh.1001-5965.2021.0255

基于滑动截获和信号相关的对流层散射频谱感知

doi: 10.13700/j.bh.1001-5965.2021.0255

1.
空军工程大学防空反导学院，西安 710051
2.
北京电子工程总体研究所，北京 100039

基金项目: 国家自然科学基金(61701525)

详细信息

通讯作者:
E-mail： dreamlq@163.com

中图分类号: TN911
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-17
- 录用日期: 2021-08-29
- 网络出版日期: 2021-09-15
- 整期出版日期: 2023-02-28

Tropospheric scattering spectrum sensing based on sliding interception and signal correlation

1.
Air and Missile Defense College，Air Force Engineering University，Xi’an 710051，China
2.
Beijing Institute of Electronic Engineering，Beijing 100039，China

Funds: National Natural Science Foundation of China (61701525)

More Information

Corresponding author: E-mail：dreamlq@163.com

摘要

摘要:
为提高对流层散射频谱感知的性能，提出了适应对流层散射多径衰落信道的频谱感知方案。针对对流层散射频谱感知性能低下的问题，在分集接收的基础上，分析对流层散射信道的时域扩散特性，提出滑动截获的方式截获信号，计算其最佳截获长度。同时，为降低噪声对检测性能的影响，利用信号的相关性，求出各截获窗内信号的相关矩阵，构造统计量，分别推导在Nakagami-m衰落信道模型下不同分集数时的检测概率和检测门限。通过仿真实验分析，验证在不同条件下所提频谱感知算法的性能，与传统算法相比，所提算法在对流层散射信道中适应性更好、性能更强。
- 对流层散射信道 /
- 频谱感知 /
- 时域扩散 /
- 相关矩阵 /
- 分集接收
Abstract:
To improve the performance of tropospheric scattering spectrum sensing, a spectral sensing scheme for tropospheric scattering multipath fading channels is presented. To solve the problem of poor perception of the tropospheric scattering spectrum, the time-domain diffusion characteristics of the tropospheric scattering channel are analyzed based on the distributed reception. The sliding intercept method is proposed to intercept the signal, and the optimal intercept length is calculated. Secondly, in order to reduce the influence of noise on the detection performance, the correlation matrix of signals in each intercept window is obtained by using the signal correlation, and the statistics are constructed. For various numbers of diversity in the Nakagami-m fading channel model, the detection probability and detection threshold are computed. Finally, the performance of the spectrum sensing algorithm under different conditions is verified by simulation analysis. Compared with traditional methods, this method has a better adaptability and better performance in tropospheric scattering channels.
- troposphere scattering channel /
- spectrum sensing /
- time domain diffusion /
- correlation matrix /
- diversified reception

HTML全文

图 1 对流层散射信道时域扩散图

Figure 1. Time domain diffusion map of tropospheric scattering channels

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图 2 对流层散射信道频谱感知方案

Figure 2. Spectrum sensing scheme for tropospheric scattering channels

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图 3 信号增益随截获窗长度变化的仿真曲线

Figure 3. Simulation curve of signal gain with intercept length

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图 4 接收机操作特性曲线

Figure 4. Receiver operating characteristic curves

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图 5 检测性能随信噪比的变化曲线

Figure 5. Variation curves of detection performance with signal-to-noise ratio

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图 6 理论结果和实际结果对比曲线

Figure 6. Comparison curves between theoretical and practical results

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图 7 不同算法检测性能比较

Figure 7. Comparison of detection performance of different algorithms

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