混沌电路在自供能系统和无线通信中的应用

发布时间：2019-07-06 07:11

【摘要】：本文主要研究了混沌电路在自供能系统中的应用,同时对混沌无线通信的信号滤波进行理论研究。主要内容如下:1.对混沌电路的功率特性进行理论研究。首先以蔡氏电路为主要研究对象分析电路中各元件在不同系统参数下瞬时功率的研究。分别对电路稳态、周期态和混沌态等状态下的瞬时功率进行数值模拟,理想情况下,蔡氏系统在不同状态下的功率平均值不随系统动力学状态的改变而改变。同时电路中非线性元件的功率为负值,即包含了电源为电路系统提供电能。同时,我们对蔡氏系统的电路元件平均功率同时随多个参数的变化用二维图形表示出来,并采用这种研究方法研究了不同的混沌电路,对比不同电路在功率消耗方面的特征。通过理论研究和数值模拟我们发现,混沌信号产生电路中非线性元件的特性会影响其功率特性,这为设计不同输出要求的自供能混沌信号发生器提供了理论基础。2.混沌信号在无线通讯中的滤波器特性研究。无线通信系统,与有线通信相比,信号的传输会受到环境的影响,如多径传播、时延扩展、衰落特性和多普勒效应等。近期发现,混沌信号在发射、传播中受无线物理媒介影响,但是在接收过程中,对特殊设计的滤波器,混沌信号在传播过程中的Lyapunov指数不改变,从而保持了混沌信号的动力学性质。基于此理论,我们选择线性高、低通滤波器对蔡氏系统中的z(t)滤波前后的功率谱进行理论研究,利用混沌系统Lyapunov指数谱,研究了滤波器截止频率对混沌信号影响规律。
文内图片：

图片说明：植入式摩擦纳米发电机驱动心脏起搏器工作流程图[32]
[Abstract]:In this paper, the application of chaotic circuit in self-energy supply system is studied, and the signal filtering of chaotic wireless communication is studied theoretically. The main contents are as follows: 1. The power characteristics of chaotic circuits are studied theoretically. Firstly, Chua's circuit is taken as the main research object to analyze the instantaneous power of each component in the circuit under different system parameters. The instantaneous power in the steady state, periodic state and chaotic state of the circuit is simulated respectively. Ideally, the average power of Chua's system in different states does not change with the change of the dynamic state of the system. At the same time, the power of nonlinear elements in the circuit is negative, that is to say, the power supply provides power for the circuit system. At the same time, we express the average power of the circuit elements of Chua's system with the variation of multiple parameters at the same time, and use this research method to study different chaotic circuits, and compare the characteristics of power consumption of different circuits. Through theoretical research and numerical simulation, we find that the characteristics of nonlinear elements in chaotic signal generation circuit will affect its power characteristics, which provides a theoretical basis for the design of self-energy chaotic signal generators with different output requirements. 2. Research on filter characteristics of chaotic signal in Wireless Communication. Compared with wired communication, signal transmission in wireless communication system is affected by environment, such as multi-path propagation, delay spread, fading characteristics and Doppler effect. Recently, it is found that chaotic signals are affected by wireless physical media in transmission and propagation, but in the process of receiving, the Lyapunov index of chaotic signals does not change in the process of propagation, thus maintaining the dynamic properties of chaotic signals. Based on this theory, we select linear high and low pass filter to study the power spectrum before and after z (t) filtering in Chua's system, and use the Lyapunov exponential spectrum of chaotic system to study the influence of filter cutoff frequency on chaotic signal.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN92;O415.5

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