基于瑞利多徑衰落信道的信號(hào)包絡(luò)頻譜感知

周義明; 李英順; 田小平

doi:10.11999/JEIT190065

基于瑞利多徑衰落信道的信號(hào)包絡(luò)頻譜感知

doi: 10.11999/JEIT190065

北京石油化工學(xué)院信息工程學(xué)院北京 102600

詳細(xì)信息

作者簡(jiǎn)介:
周義明：男，1976年生，講師，研究方向?yàn)闊o線通信、信號(hào)處理、FPGA

李英順：女，1971年生，教授，研究方向?yàn)樾盘?hào)檢測(cè)與處理、故障識(shí)別

田小平：男，1973年生，副教授，研究方向?yàn)闊o線通信、信號(hào)處理、室內(nèi)定位

通訊作者:
周義明　zhouyiming@bipt.edu.cn

中圖分類號(hào): TN911
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2019-01-24
- 修回日期: 2019-09-05
- 網(wǎng)絡(luò)出版日期: 2020-01-20
- 刊出日期: 2020-06-04

Spectrum Sensing Based on Signal Envelope of Rayleigh Multi-path Fading Channels

Information Engineering College, Beijing Institute of Petrochemical Technology, Beijing 102600, China

摘要

摘要:
為提高信號(hào)采樣值之間的相關(guān)性和降低噪聲對(duì)感知性能的影響，該文提出基于信號(hào)包絡(luò)自相關(guān)矩陣的頻譜感知算法。首先對(duì)采樣信號(hào)等間隔時(shí)長(zhǎng)截取，以相鄰間隔的采樣值計(jì)算信號(hào)自相關(guān)性，并構(gòu)造出近似自相關(guān)矩陣。其次依據(jù)矩陣次對(duì)角線元素性質(zhì)構(gòu)造了統(tǒng)計(jì)量。分別計(jì)算了該統(tǒng)計(jì)量的檢測(cè)概率分布函數(shù)與虛警概率分布函數(shù)，分析了頻譜感知算法的檢測(cè)性能，算法優(yōu)化了信號(hào)相關(guān)性的計(jì)算，降低了噪聲對(duì)感知性能的影響。最后通過仿真驗(yàn)證了不同參數(shù)對(duì)檢測(cè)概率和虛警概率的影響，并提出了進(jìn)一步提高檢測(cè)性能的措施。
- 頻譜感知 /
- 瑞利信道 /
- 信號(hào)包絡(luò) /
- 相關(guān)矩陣
Abstract:
In order to improve the correlation between signal samplings and reduce the influence of noise on sensing performance, a spectrum sensing algorithm based on signal envelope autocorrelation matrix is proposed in the paper. Firstly, the sampling signals are intercepted at equal intervals, the signal autocorrelations are calculated by means of the adjacent interval samples, and an approximate autocorrelation matrix is constructed. Secondly, the statistic is constructed according to the properties of the sub-diagonal elements of the matrix. The detection probability distribution function and the false alarm probability distribution function of the statistic are calculated respectively. The detection performances of the spectrum sensing algorithm are analyzed. The algorithm optimizes the calculation of signal correlation and reduces the impact of noise on detection performance. Finally, the effects of different parameters on detection probability and false alarm probability are verified by simulation, and some measures are proposed to improve detection performance.
- Spectrum sensing /
- Rayleigh channels /
- Signal envelope /
- Correlation matrix

HTML全文

圖 1 不同包絡(luò)噪聲功率比條件下檢測(cè)概率與虛警概率的關(guān)系

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圖 2 不同信號(hào)相關(guān)系數(shù)對(duì)檢測(cè)概率的影響

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圖 3 包絡(luò)噪聲功率比與檢測(cè)概率在不同相關(guān)系數(shù)下的對(duì)應(yīng)關(guān)系

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圖 4 包絡(luò)檢測(cè)、能量檢測(cè)和統(tǒng)計(jì)協(xié)方差檢測(cè)的檢測(cè)性能比較

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圖 5 實(shí)際感知與理論感知在不同信噪比條件下的效果比較

下載: 全尺寸圖片幻燈片

參考文獻(xiàn)(16)

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