基于认知无线电的跳频图案设计方法的研究

发布时间：2018-05-09 07:41

本文选题：跳频图案 + 认知无线电　；参考：《电子科技大学》2015年硕士论文

【摘要】：跳频图案是跳频通信系统性能好坏、抗干扰能力强弱的决定性因素,是跳频频率变化的规律。常规跳频通信的过程中,跳频图案使得跳频信号在很宽的带宽范围内均匀连续地占用每个信道,没有考虑周围电磁环境的影响,是一种“盲跳频”的方式,若是在跳频带宽范围内有干扰信号的存在,将会导致接收端的误码,严重影响跳频通信的质量。认知无线电技术是一种智能化的管理和利用频谱资源的技术,为解决频谱资源紧缺、解决干扰等提供了良好的思路。本文在深入理解认知无线电技术的原理和分析跳频信号的特点之后,将认知无线电技术应用于跳频图案的设计。频谱感知技术是认知无线电技术的核心,本文将其作为研究的首要环节。本文在综合分析了频域频谱感知的方法后,研究了一种基于小波阈值去噪的多窗口谱估计感知方法。通过实验分析比较,本文研究的方法具有最优的分辨率和检测性能。本文采用这种方法对通信环境(特指跳频通信环境)进行分析,区分出频谱空洞与干扰信号存在的频段。跳频信号的信息获取作为本文研究的第二环节,用于对跳频信号进行深入的认知分析。本文通过时频分析以及多频点的参数平滑算法获取了跳频图案的存在性信息、相关参数信息以及跳频信号的调制规律。通过实验证明,这些算法有良好的性能。差分跳频图案设计方法的研究作为本文研究的第三环节,本文深入分析比较了各种差分跳频图案的设计方法,明确了跳频图案设计的思路与性能检测的方法。在完成了以上环节的研究后,本文研究了一种非连续频段的跳频图案设计方法。本文详细阐述了设计的原理,设计的结构以及具体的工作流程,对设计出的跳频图案进行了汉明相关性、随机性、一维均匀性、二维连续性、抗干扰性的检测。通过实验分析,本文设计的跳频图案具有优良的性能,证明了将认知无线电技术应用于跳频图案设计的可行性,为今后的工程设计提供了参考。
[Abstract]:Frequency hopping pattern is the decisive factor of the performance of frequency hopping communication system and the rule of frequency hopping frequency change. In the process of conventional frequency-hopping communication, the frequency hopping pattern causes the frequency hopping signal to occupy every channel uniformly and continuously in a wide bandwidth, without considering the influence of the surrounding electromagnetic environment, so it is a kind of "blind frequency hopping" method. If the interference signal exists in the frequency hopping bandwidth, it will lead to the error of the receiver and seriously affect the quality of the frequency hopping communication. Cognitive radio technology is a kind of intelligent management and utilization of spectrum resources technology, which provides a good way to solve the shortage of spectrum resources and interference. After deeply understanding the principle of cognitive radio technology and analyzing the characteristics of frequency hopping signal, this paper applies cognitive radio technology to the design of frequency hopping pattern. Spectrum sensing is the core of cognitive radio technology. After synthetically analyzing the spectrum sensing method in frequency domain, a multi-window spectrum estimation sensing method based on wavelet threshold de-noising is studied in this paper. Through experimental analysis and comparison, the method studied in this paper has the best resolution and detection performance. In this paper, this method is used to analyze the communication environment (especially frequency hopping communication environment) and to distinguish the frequency band between the frequency gap and the interference signal. As the second step of this paper, the information acquisition of frequency hopping signal is used for deep cognitive analysis of frequency hopping signal. In this paper, the existence information of frequency hopping pattern, the related parameter information and the modulation law of frequency hopping signal are obtained by time-frequency analysis and multi-frequency parameter smoothing algorithm. Experiments show that these algorithms have good performance. As the third step of this paper, the design method of differential frequency hopping pattern is studied, and the design method of different frequency hopping pattern is analyzed and compared, and the train of thought of frequency hopping pattern design and the method of performance testing are clarified. After the above research, a design method of frequency hopping pattern in discontinuous frequency band is studied in this paper. In this paper, the principle, structure and working flow of the design are described in detail. The frequency hopping pattern is detected by hamming correlation, randomness, one-dimensional uniformity, two-dimensional continuity and anti-interference. Through experimental analysis, the FH pattern designed in this paper has excellent performance, which proves the feasibility of applying cognitive radio technology to FH pattern design, and provides a reference for future engineering design.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN914.41

【参考文献】