基于频谱感知的自适应跳频抗干扰通信系统的仿真研究

发布时间：2018-05-14 23:27

本文选题：随机矩阵理论 + 频谱感知　；参考：《电子科技大学》2014年硕士论文

【摘要】：随着通信对抗技术的发展,电磁环境日益恶劣,通信系统随时会遭到敌方的干扰和破坏,因此对电磁环境的侦察技术和通信系统的抗干扰技术成为了通信对抗技术的关键。本文主要针对频谱感知技术、跳频通信技术和自适应抗干扰技术这三方面,对自适应跳频抗干扰通信技术进行了深入的研究。干扰信号的频谱感知算法的研究。为了准确地认知干扰信号,针对噪声不确定性因素的影响,提出了一种新型频谱感知算法——基于矩阵特征值极值与能量比值(Range of Eigenvalue-Energy Detection,RE-ED)的频谱感知算法。本文根据随机矩阵理论(Random Matrix Theory,RMT),利用一种多定向天线接收方法,对接收信号采样协方差矩阵的特征值极差与平均能量进行了分析与研究,提出了RE-ED算法。通过对该算法进行仿真,结果表明,该算法较之传统频谱感知方法,不但有效地克服了噪声不确定度对判决的影响,而且在信噪比良好的情形下检测概率收敛于1。在应用中采用ED算法与RE-ED算法结合的方法,在信噪比恶化并且噪声不确定性影响的情形下保证了整体检测概率大于0.6。跳频通信模型的建立。为自适应抗干扰系统提供仿真平台,设计一个符合指标的跳频通信系统。首先,对跳频通信系统进行了详细分析,包括跳频系统的原理、数学模型以及主要特点。其次,对跳频系统的主要参数进行了分析,并针对后续自适应抗干扰系统的研究对跳频通信系统的提出了相应的指标要求。最后,对跳频系统进了建模和仿真分析,达到了系统设计的4项指标。自适应跳频抗干扰通信技术的系统仿真与实现。针对复杂的干扰信号,在跳频通信系统仿真平台之上提出了三种自适应抗干扰系统。首先,对常见的通信干扰系统进行了分类,并将干扰信号分为阻塞式干扰、宽带全频段干扰和跟踪式干扰三种干扰类型。其次,针对这三种干扰类型提出了对应的自适应抗干扰跳频通信系统,分别为扰隙自适应跳频抗干扰系统、功率自适应抗干扰系统和跳速自适应抗干扰系统。最后,对三种自适应抗干扰跳频通信系统分别进行了理论研究、参数分析以及建模仿真,并分别对仿真结果进行了分析总结。结果表明三种自适应跳频干扰系统频谱避免了被干扰频谱淹没,达到了成功抗干扰的通信效果。同时均使得误码率收敛于0.05以下,收敛率均大于85%,从而也反映了自适应抗干扰系统的抗干扰效果明显。
[Abstract]:With the development of communication countermeasure technology, the electromagnetic environment is getting worse and worse, and the communication system will be interfered and destroyed by the enemy at any time. Therefore, the reconnaissance technology of electromagnetic environment and the anti-jamming technology of communication system have become the key of communication countermeasure technology. In this paper, the spectrum sensing technology, frequency hopping communication technology and adaptive anti-jamming technology are studied deeply. Research on spectrum sensing algorithm of interference signal. A novel spectrum sensing algorithm based on the matrix eigenvalue extremum and energy ratio (range of Eigenvalue-Energy detection RE-ED) is proposed to accurately recognize the interference signal and to deal with the effect of noise uncertainty. In this paper, based on the random Matrix theory, a multi-directional antenna receiving method is used to analyze and study the eigenvalue range and average energy of the sampling covariance matrix of the received signal, and a RE-ED algorithm is proposed. The simulation results show that the proposed algorithm not only overcomes the influence of noise uncertainty on the decision, but also converges to 1 when the signal-to-noise ratio is good. In the application, Ed algorithm combined with RE-ED algorithm is used to ensure the overall detection probability greater than 0.6 under the condition of the deterioration of SNR and the influence of noise uncertainty. The establishment of frequency hopping communication model. To provide a simulation platform for adaptive anti-jamming system, a frequency hopping communication system is designed. Firstly, the FH communication system is analyzed in detail, including the principle, mathematical model and main features of FH system. Secondly, the main parameters of frequency hopping system are analyzed, and the corresponding index requirements of frequency hopping communication system are put forward for the study of subsequent adaptive anti-jamming system. Finally, the FH system is modeled and simulated, and four indexes of the system design are achieved. System simulation and implementation of adaptive frequency hopping anti-jamming communication technology. Based on the simulation platform of frequency hopping communication system, three adaptive anti-jamming systems are proposed for complex jamming signals. Firstly, the common communication jamming systems are classified, and the jamming signals are divided into three types: blocking jamming, wideband full-band jamming and tracking jamming. Secondly, the corresponding adaptive anti-jamming frequency hopping communication system is proposed for these three kinds of interference types, which are the interference gap adaptive frequency hopping anti-jamming system, the power adaptive anti-jamming system and the speed hopping adaptive anti-jamming system. Finally, three kinds of adaptive anti-jamming frequency hopping communication systems are studied in theory, parameter analysis and modeling and simulation, and the simulation results are analyzed and summarized respectively. The results show that the spectrum of the three adaptive frequency hopping jamming systems can avoid being swamped by the interference spectrum and achieve a successful anti-jamming communication effect. At the same time, the BER converges below 0.05, and the convergence rate is more than 850.This also reflects the anti-jamming effect of the adaptive anti-jamming system.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN975

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