最优低碰撞区跳频序列集的研究

发布时间：2018-05-08 13:27

本文选题：跳频序列 + 汉明相关　；参考：《西华大学》2017年硕士论文

【摘要】：随着时代的进步和科技的不断发展,人们对通信的要求越来越高。跳频多址扩频系统由于它的抗干扰性、安全性、多址性等众多优点被广泛应用于军事电台通信、移动通信、现代雷达和声纳回声定位系统等。通常情况下,在码分多址环境中,我们希望发射机之间的相互干扰水平尽可能低。当有两个或多个发射机在同一个频率点上同时传输信号时容易发生相互之间的干扰,而相互干扰的程度和所用的跳频序列的汉明相关性紧密相连。因而,设计具有良好的汉明相关特性的跳频序列是研究跳频技术必不可少的内容。2003年西南交大叶文霞和范平志等人首次提出低碰撞区/零碰撞区(Low Hit Zone/Zero Hit Zone,LHZ/NHZ)跳频序列的概念,该概念被应用于准同步通信系统,LHZ/NHZ跳频序列的汉明相关值的大小对于准同步通信系统抗多址干扰的能力具有重要意义。因此,LHZ/NHZ跳频序列集的设计成为研究跳频通信的重要内容之一。在本文中我们基于交织技术,给出了一类具有新参数的最优低碰撞区跳频序列集。对于给定的跳频序列,通过改变基序列集和选择适当的移位序列集可以构造出具有不同参数的低碰撞区跳频序列集,新序列集关于LHZ/NHZ跳频序列汉明相关理论界最优。本文主要研究最优低碰撞区跳频序列集的设计。(1)分析了已有的跳频序列集理论界各参数之间的约束关系。跳频序列理论界主要包含以下参数:频隙集个数、跳频序列的序列长度、跳频序列的序列个数、跳频序列的低碰撞区和汉明相关等,针对跳频序列的常用理论界,包括常规跳频序列最大汉明相关函数及其理论界,平均汉明相关函数及其理论界,部分汉明相关函数及其理论界和低碰撞区跳频序列集最大汉明相关函数及其理论界,平均汉明相关函数及其理论界,部分汉明相关函数及其理论界,分析了在这些理论界限制的情况下参数间的约束关系。这些理论界的参数关系图对跳频序列的构造提供了指导意义。(2)介绍了本文用于构造跳频序列的交织技术理论,研究和分析了基于交织技术构造最优低碰撞区跳频序列集的方法,并给出了序列参数对比分析及性能分析。(3)研究了基于交织技术构造最优低碰撞区跳频序列集的方法,通过研究分析前人所用到的交织技术,提出了一种新的交织方式,并采用该方法得到了一类低碰撞区跳频序列集,新序列集具有新的参数并关于周期汉明相关函数达到最优,另外给出了序列参数对比,构造实例及性能分析。(4)对本文的工作进行了总结并对未来工作予以展望。
[Abstract]:With the progress of the times and the continuous development of science and technology, the demand for communication is getting higher and higher. The frequency hopping multiple access spread spectrum system has been widely used in military radio communication, mobile communication, modern radar and sonar echo location system because of its anti-interference, security, multiple access and so on. In general, the system is in the code division multiple access environment. We hope that the level of mutual interference between transmitters is as low as possible. When two or more transmitters transmit signals at the same frequency point at the same time, it is easy to interfere with each other, and the degree of mutual interference is closely connected with the Hamming correlation of the frequency hopping sequence. Therefore, the design has good Hamming correlation. Frequency hopping sequence is an essential part of frequency hopping technology. The concept of Low Hit Zone/Zero Hit Zone (LHZ/NHZ) frequency hopping sequence is first proposed by Ye Wenxia and Fan Pingzhi in.2003 and zero collision zone (LHZ/NHZ) in Southwest Jiaotong University. This concept is applied to the quasi synchronous communication system. The magnitude of the Hamming value of the LHZ/ NHZ frequency hopping sequence is quasi identical. The ability of the step communication system to resist multiple access interference is of great significance. Therefore, the design of the LHZ/NHZ frequency hopping sequence set is one of the most important contents in the study of frequency hopping communication. In this paper, we give a class of optimal low collision zone frequency hopping sequences with new parameters based on interleaving technology. And the selection of appropriate shift sequence sets can construct a set of low collision frequency hopping sequences with different parameters. The new sequence set is the best for the LHZ/NHZ frequency hopping sequence. This paper mainly studies the design of the frequency hopping sequence set in the optimal low collision region. (1) the constraints of the existing parameters of the frequency hopping sequence set are analyzed. The theory of frequency hopping sequence mainly includes the following parameters: the number of frequency gap set, the sequence length of the frequency hopping sequence, the sequence number of frequency hopping sequence, the low collision region of the frequency hopping sequence and the correlation of Hamming, etc., for the frequency hopping sequence, including the maximum Hamming correlation function and its theoretical circle of the frequency hopping sequence, and the average Hamming correlation function and its theory The theorists, some hingling correlation functions and their theoretical circles and the largest Hamming correlation function and its theoretical circle, the average hingling correlation function and its theoretical circle, some Hamming correlation functions and their theoretical circles, analyze the constraint relations between the parameters in these theorists, and the parametric relation diagrams of these theorists. It provides guiding significance for the construction of frequency hopping sequence. (2) this paper introduces the interleaving technique theory used in the construction of frequency hopping sequence, studies and analyzes the method of constructing the optimal frequency hopping sequence set based on interleaving technology, and gives the comparison and analysis of sequence parameters and performance analysis. (3) the optimal low collision based on interleaving technology is studied. The method of frequency hopping sequence set, through the study and analysis of the interleaving technology used by predecessors, presents a new interleaving method, and uses this method to get a class of frequency hopping sequences of low collision regions. The new sequence sets have new parameters and the correlation function of the periodic Hamming is optimal. Furthermore, the comparison of the sequence parameters is given and an example is constructed. Performance analysis. (4) the work of this paper is summarized and future work is prospected.

【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN914.41

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