發(fā)布時間：2018-06-27 22:10

  本文選題：混沌四進制數字通信 + 相軌跡粗糙度分析�。� 參考：《哈爾濱工程大學》2016年博士論文

【摘要】：混沌信號的非周期、寬頻帶、不可預測以及易于產生等特點使得其在通信領域中得到了廣泛應用。通�；煦缤ㄐ畔到y(tǒng)的保密性要優(yōu)于常規(guī)數字通信系統(tǒng),但是其信息傳輸速率和誤碼率相對較差,加之混沌同步技術并未取得突破性進展,使得實際構建的混沌通信系統(tǒng)在信息傳輸效率、誤碼率等系統(tǒng)性能上無法與常規(guī)通信系統(tǒng)相匹敵,導致混沌通信研究一直處于理論研究階段,不能進行實際工程應用;對現(xiàn)有混沌通信系統(tǒng)誤碼率性能評估主要依賴于混沌映射的類型,通過選擇合適的混沌映射可以有效提升混沌通信系統(tǒng)的誤碼率性能;從信息傳輸效率上考慮混沌通信研究發(fā)展問題,現(xiàn)在混沌二進制通信研究較多,關于混沌多進制通信研究相對較少。當前混沌通信的研究趨勢主要分為兩個方向:第一個方向針對混沌同步技術進行研究突破以及繼續(xù)研究經典混沌保密通信系統(tǒng);第二方向隨著混沌理論的不斷發(fā)展,通過尋找新的混沌振子探索新的調制解調技術,為混沌通信理論的研究提供新的研究領域和實現(xiàn)方案。本文從第二個方向出發(fā),以提高混沌通信系統(tǒng)的信息傳輸效率和誤碼率性能.為目的,開展了對時空混沌Hamilton振子在四進制數字通信領域應用的探索研究。本文在文獻[107]中提出的Hamilton混沌多進制調制解調方法的基礎上圍繞時空混沌Hamilton振子應用于四進制數字通信中的主要技術實現(xiàn)問題展開討論,重點研究了不同噪聲下Hamilton混沌基帶解調器的設計問題以及基于無線傳輸的Hamilton混沌四進制數字通信系統(tǒng)設計問題。具體開展的工作包括以下幾個方面:(1)針對現(xiàn)有Hamilton混沌四進制數字通信系統(tǒng)信息傳輸效率低的問題,本文通過研究Hamilton混沌基帶信號無線傳輸的頻譜節(jié)省問題,在QAM射頻調制下設計了支持以Nyquist率傳輸Hamilton混沌基帶信息的四進制通信系統(tǒng)。該系統(tǒng)通過正交調制將雙路Hamilton混沌調制信號合成一路進行信號傳輸,較AM調制方式節(jié)省了信道數量,提高了信息傳輸效率和頻帶利用率。在搭建Hamilton混沌QAM四進制數字通信系統(tǒng)時解決了本地載波恢復、Hamilton振子相軌跡重建、區(qū)域檢測器(混沌解調器)實現(xiàn)、符號同步信號恢復等問題,并進行了仿真驗證。最后討論了 Hamilton混沌QAM四進制通信系統(tǒng)的硬件可實現(xiàn)性和復雜度,利用FPGA平臺設計實現(xiàn)了 Hamilton混沌四進制調制解調模塊,并結合現(xiàn)成射頻調制解調芯片設計實現(xiàn)了 Hamilton混沌四進制通信系統(tǒng),給出了硬件設計和測試結果。(2)針對Hamilton混沌基帶解調方法易受信道噪聲影響的問題,本文研究了白噪聲以及彩色噪聲兩種信道噪聲下區(qū)域分割解調器(Hamilton混沌基帶解調器)邊界設計方法,提出了基于曲線擬合和概率統(tǒng)計原理的兩種區(qū)域分割解調器邊界確定方法。以Hamilton混沌QAM四進制通信系統(tǒng)為基礎,本文首先分析了加性高斯白噪聲信道對Hamilton調制信號相軌跡形狀影響規(guī)律,通過待解調混沌信號的概率密度函數分布關系給出了噪聲與Hamilton調制信號相軌跡的定量關系,然后通過大概率事件置信區(qū)間給出了區(qū)域分割解調器的邊界參考范圍。其次運用曲線擬合法直接給出了信噪比與Hamilton調制信號相軌跡最大粗糙度的關系曲線,該方法的好處在于無需知道信道噪聲概率分布特性即可給出區(qū)域分割解調器邊界確定范圍,對于非高斯分布的噪聲也適用。最后給出了彩色噪聲下區(qū)域分割解調器邊界確定方法,主要設計思路為首先將彩色噪聲進行白化處理,然后運用白噪聲下的邊界設計思路去指導設計區(qū)域分割解調器的邊界范圍。(3)針對彩色噪聲下Hamilton混沌四進制通信系統(tǒng)白化器的實現(xiàn)問題,提出了一種發(fā)射機信號預失真處理和接收機信號預白化處理的設計方法。針對加性彩色噪聲信道下Hamilton混沌四進制通信系統(tǒng)的設計問題,本文給出了預失真處理、白化處理、上下變頻處理、區(qū)域分割解調器設計和符號同步電路等關鍵模塊的設計方法,并設計了抗彩色噪聲Hamilton混沌.QAM四進制通信系統(tǒng),仿真結果表明該方法具有抗彩色噪聲性能。最后對本文尚未解決和下一步的研究計劃進行闡述。
[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.
【學位授予單位】：哈爾濱工程大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN914.3

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