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基于最大后验概率准则的宽带航空通信频域干扰检测算法
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TN919.4

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A Jamming Detection Algorithm Based on Maximum Posterior Probability in Frequency Domain for Broadband Aeronautical Communications
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    摘要:

    航空通信频段资源有限,航空宽带通信系统将不可避免地受到窄带通信系统的干扰。提出了一种基于最大后验概率准则的频域干扰检测算法,并结合频率阈值切除算法实现精确的干扰抑制。建立了基于最大后验概率准则的干扰检测算法的算法结构,并从假设检验理论出发,推导了检测阈值的设定公式。另外,对比了单载波频域均衡与正交频分复用在窄带干扰下的性能,挖掘了单载波频域均衡的性能优势,为其在宽带航空通信的潜在应用提供了理论和实验支撑,并将所提的频域干扰检测算法应用于单载波频域均衡。仿真结果表明,在干扰带宽占信号带宽分别为20%、10%和5%的条件下,与传统的基于均值、方差和中位数的干扰检测算法相比,算法在低干信比和高干信比下(-20~20 dB)均取得了更低的误码率。

    Abstract:

    In view of the problems that frequency band resources of aviation communication are limited, and aviation broadband communication system is inevitably interfered with narrowband communication system, a jamming detection algorithm is proposed in frequency domain based on the maximum posterior probability criterion to achieve accurate jamming suppression in combination with the frequency threshold excision algorithm. In this paper, the algorithm structure of the jamming detection algorithm based on the maximum posterior probability criterion is established, and the formula of the detection threshold is derived from the hypothesis testing theory. In addition, the performance of single carrier frequency domain equalization is compared to that of the orthogonal frequency division multiplexing under narrowband jamming, and the performance advantages of single carrier frequency domain equalization are explored, providing theoretical and experimental support for its potential application in broadband aviation communication. And then, the proposed jamming detection algorithm is applied to single carrier frequency domain equalization. The simulation results show that this algorithm achieves yet a lower error rate at both low and high jamming-to-signal ratio (-20~20 dB) in comparison with the traditional jamming detection algorithms based on mean, variance, and median under conditions of the interference bandwidth being occupied 20%, 10% and 5% in the signal bandwidth respectively.

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王鹏, 向新, 赖建萍, 董鹏宇, 梁源, 王瑞.基于最大后验概率准则的宽带航空通信频域干扰检测算法[J].空军工程大学学报,2025,26(3):2-8

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  • 在线发布日期: 2025-06-04
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