基于Hamilton振子的混沌四进制数字通信系统设计及其仿真研究

发布时间：2018-06-27 22:10

本文选题：混沌四进制数字通信 + 相轨迹粗糙度分析　；参考：《哈尔滨工程大学》2016年博士论文

【摘要】：混沌信号的非周期、宽频带、不可预测以及易于产生等特点使得其在通信领域中得到了广泛应用。通常混沌通信系统的保密性要优于常规数字通信系统,但是其信息传输速率和误码率相对较差,加之混沌同步技术并未取得突破性进展,使得实际构建的混沌通信系统在信息传输效率、误码率等系统性能上无法与常规通信系统相匹敌,导致混沌通信研究一直处于理论研究阶段,不能进行实际工程应用;对现有混沌通信系统误码率性能评估主要依赖于混沌映射的类型,通过选择合适的混沌映射可以有效提升混沌通信系统的误码率性能;从信息传输效率上考虑混沌通信研究发展问题,现在混沌二进制通信研究较多,关于混沌多进制通信研究相对较少。当前混沌通信的研究趋势主要分为两个方向:第一个方向针对混沌同步技术进行研究突破以及继续研究经典混沌保密通信系统;第二方向随着混沌理论的不断发展,通过寻找新的混沌振子探索新的调制解调技术,为混沌通信理论的研究提供新的研究领域和实现方案。本文从第二个方向出发,以提高混沌通信系统的信息传输效率和误码率性能.为目的,开展了对时空混沌Hamilton振子在四进制数字通信领域应用的探索研究。本文在文献[107]中提出的Hamilton混沌多进制调制解调方法的基础上围绕时空混沌Hamilton振子应用于四进制数字通信中的主要技术实现问题展开讨论,重点研究了不同噪声下Hamilton混沌基带解调器的设计问题以及基于无线传输的Hamilton混沌四进制数字通信系统设计问题。具体开展的工作包括以下几个方面:(1)针对现有Hamilton混沌四进制数字通信系统信息传输效率低的问题,本文通过研究Hamilton混沌基带信号无线传输的频谱节省问题,在QAM射频调制下设计了支持以Nyquist率传输Hamilton混沌基带信息的四进制通信系统。该系统通过正交调制将双路Hamilton混沌调制信号合成一路进行信号传输,较AM调制方式节省了信道数量,提高了信息传输效率和频带利用率。在搭建Hamilton混沌QAM四进制数字通信系统时解决了本地载波恢复、Hamilton振子相轨迹重建、区域检测器(混沌解调器)实现、符号同步信号恢复等问题,并进行了仿真验证。最后讨论了 Hamilton混沌QAM四进制通信系统的硬件可实现性和复杂度,利用FPGA平台设计实现了 Hamilton混沌四进制调制解调模块,并结合现成射频调制解调芯片设计实现了 Hamilton混沌四进制通信系统,给出了硬件设计和测试结果。(2)针对Hamilton混沌基带解调方法易受信道噪声影响的问题,本文研究了白噪声以及彩色噪声两种信道噪声下区域分割解调器(Hamilton混沌基带解调器)边界设计方法,提出了基于曲线拟合和概率统计原理的两种区域分割解调器边界确定方法。以Hamilton混沌QAM四进制通信系统为基础,本文首先分析了加性高斯白噪声信道对Hamilton调制信号相轨迹形状影响规律,通过待解调混沌信号的概率密度函数分布关系给出了噪声与Hamilton调制信号相轨迹的定量关系,然后通过大概率事件置信区间给出了区域分割解调器的边界参考范围。其次运用曲线拟合法直接给出了信噪比与Hamilton调制信号相轨迹最大粗糙度的关系曲线,该方法的好处在于无需知道信道噪声概率分布特性即可给出区域分割解调器边界确定范围,对于非高斯分布的噪声也适用。最后给出了彩色噪声下区域分割解调器边界确定方法,主要设计思路为首先将彩色噪声进行白化处理,然后运用白噪声下的边界设计思路去指导设计区域分割解调器的边界范围。(3)针对彩色噪声下Hamilton混沌四进制通信系统白化器的实现问题,提出了一种发射机信号预失真处理和接收机信号预白化处理的设计方法。针对加性彩色噪声信道下Hamilton混沌四进制通信系统的设计问题,本文给出了预失真处理、白化处理、上下变频处理、区域分割解调器设计和符号同步电路等关键模块的设计方法,并设计了抗彩色噪声Hamilton混沌.QAM四进制通信系统,仿真结果表明该方法具有抗彩色噪声性能。最后对本文尚未解决和下一步的研究计划进行阐述。
[Abstract]:The non periodic, wideband, unpredictable and easy to produce chaotic signals make it widely used in the communication field. Generally, the confidentiality of chaotic communication systems is better than the conventional digital communication system, but its information transmission rate and error rate are relatively poor, and the chaotic synchronization technology has not made breakthrough progress. The chaotic communication system can not match the conventional communication system in the performance of information transmission efficiency, error rate and so on. The chaotic communication research has been in the stage of theoretical research and can not be applied to practical engineering. The performance evaluation of the existing chaotic communication system is mainly dependent on the type of chaotic mapping. Choosing the appropriate chaotic mapping can effectively improve the performance of the bit error rate of the chaotic communication system. The research and development of chaotic communication is considered from the information transmission efficiency. There are many researches on chaotic binary communication, and the research on chaotic multi system communication is relatively few. The main research trend of chaotic communication is divided into two directions: the first The direction of the chaos synchronization technology research breakthrough and continue to study the classical chaotic secure communication system; the second direction, with the continuous development of chaos theory, through the search for new chaotic oscillator to explore new modulation and demodulation technology, to provide new research field and implementation scheme for the research of chaotic communication theory. This paper from second directions In order to improve the information transmission efficiency and bit error rate performance of the chaotic communication system, an exploration and Research on the application of spatio-temporal chaotic Hamilton oscillator in the field of four digital communication is carried out. Based on the Hamilton chaotic multilevel modulation and demodulation method proposed in literature [107], the application of the spatio-temporal chaotic Hamilton oscillator is applied. The main technical realization of the four digital communication is discussed. The design of the Hamilton chaotic baseband demodulator under different noise and the design of the Hamilton chaotic four system digital communication system based on wireless transmission are studied. The specific work includes the following aspects: (1) the existing Hamilton chaos The problem of low information transmission efficiency in the four band digital communication system is studied. By studying the spectrum saving problem of the Hamilton chaotic baseband signal wireless transmission, this paper designs a four band communication system which supports the information of the Hamilton chaotic baseband with the Nyquist rate under the radio frequency modulation. The system uses orthogonal modulation to modulate the dual Hamilton chaotic modulation. Signal transmission is carried out all the way, which saves the number of channels and improves the efficiency of information transmission and bandwidth utilization compared with the AM modulation mode. When building a Hamilton chaotic QAM four system digital communication system, the local carrier recovery, the Hamilton oscillator phase trajectory reconstruction, the region detector (chaotic demodulator) implementation, and the symbol synchronization signal recovery are solved. In the end, the hardware realization and complexity of the Hamilton chaotic QAM four system are discussed, and the Hamilton chaotic four system modulation and demodulation module is realized by using the FPGA platform, and the Hamilton chaotic four system communication system is designed and implemented with the ready-made RF modulation and demodulation chip. Hardware design and test results. (2) in view of the problem that the Hamilton chaotic baseband demodulation method is easily affected by the channel noise, this paper studies the boundary design method of the region segmentation demodulator (Hamilton chaotic baseband demodulator) under the white noise and the color noise, and puts forward two regions based on the principle of curve fitting and probability statistics. The method of boundary determination of domain division demodulator. Based on Hamilton chaotic QAM four communication system, this paper first analyzes the influence of the additive Gauss white noise channel on the phase trajectory shape of the Hamilton modulation signal, and gives the phase path of the noise and the Hamilton modulation signal through the probability density function distribution of the chaotic signal to be demodulated. The boundary reference range of the region segmentation demodulator is given through the confidence interval of the large probability event. Secondly, the curve fitting method is used to direct the relationship curve of the maximum roughness of the phase trajectory of the signal to noise ratio and the Hamilton modulation signal. The advantage of this method is that the probability distribution characteristic of the noise of the channel signal can be given without knowing the probability distribution characteristic of the channel noise. The domain division demodulator boundary determination range is also suitable for the non Gauss distribution noise. Finally, the boundary determination method of the region segmentation demodulator under the color noise is given. The main design idea is to whiten the color noise first, and then use the boundary design idea under white noise to guide the boundary of the design of the region segmentation demodulator. (3) (3) a design method of predistortion processing of transmitter signal and pre whitening of receiver signal is proposed in view of the realization of the whitening device of Hamilton chaotic four system communication system under color noise. The predistortion processing is given in this paper for the design of Hamilton chaotic four system communication system under additive color noise channel. The design of the key modules such as the whitening processing, up and down conversion processing, the design of the region division demodulator and the symbol synchronization circuit, and the design of the anti color noise Hamilton chaotic.QAM four system communication system. The simulation results show that the method has the performance of anti color noise. Finally, the research plan which has not been solved and the next step is explained. Say.
【学位授予单位】：哈尔滨工程大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN914.3

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