基于cSVB算法的DME脉冲干扰抑制方法

doi:10.12305/j.issn.1001-506X.2024.08.35

Abstract

Abstract:

To solve the problem that the distance measure equipment (DME) signal seriously interferes with the forward link receiver of L-band digital aviation communication system (L-DACS), a DME pulse interference suppression method based on correlated sparse variational Bayesian (cSVB) algorithm is proposed. In this method, the empty subcarrier information of the orthogonal frequency division multiplexing (OFDM) receiver of L-DACS system is used to construct the compressed sensing equation of the received signal. Then, three-level Bayesian signal modeling is carried out according to the cSVB algorithm. Finally, two variant algorithms are selected to reconstruct DME interference signal and remove it from the received signal in the time domain. Theoretical analysis and simulation results show that the proposed interference suppression method can make full use of prior information and further reduce the normalized mean square error of DME interference signal estimation, effectively improve the error performance of L-DACS system, and enhance the transmission reliability.

Key words: L-band digital aviation communication system (L-DACS), distance measure equipment (DME), block sparse Bayesian, variational Bayesian inference

CLC Number:

TN973.3

Dongxia LI, Jiani WANG, Xiangqing PENG, Haitao LIU, Lei WANG. DME pulse interference suppression method based on cSVB algorithm[J]. Systems Engineering and Electronics, 2024, 46(8): 2877-2885.

Figures/Tables 8

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References 30

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参数	取值
传输带宽/MHz	0.498 05
子载波间隔/Hz	9 765.625
循环前缀/μs	17.6
OFDM符号周期/μs	102.4
有用子载波数	50
编码	卷积编码、交织编码
调制方式	正交相移键控
信道模型	AWGN/多径信道
DME干扰源数	1
DME载波偏移量/kHz	500
信干比/dB	-7
多径数目	8

[1]	Dongxia LI, Qiuyu CHEN, Lei WANG, Haitao LIU. DME pulse interference suppression method based on BSBL-BO algorithm [J]. Systems Engineering and Electronics, 2021, 43(9): 2649-2656.
[2]	ZHANG Yongshun, ZHU Weigang, JIA Xin, WANG Manxi. NBI detection and parameter estimation in DSSS communications based on BSBL [J]. Systems Engineering and Electronics, 2019, 41(4): 889-897.
[3]	LI Dong-xia, LI Si, LIU Hai-tao. Cyclostationarity of carrier offset distance measure equipment signals [J]. Systems Engineering and Electronics, 2016, 38(8): 1935-1938.
[4]	LI Dong-xia, CUI Yan-min, LIU Hai-tao, LI Si. Distance measure equipment impulse interference mitigation method based on JADE [J]. Systems Engineering and Electronics, 2016, 38(2): 423-427.

DME pulse interference suppression method based on cSVB algorithm

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