本文選題：M序列 + FFT　； 參考：《東北石油大學(xué)》2014年碩士論文

【摘要】：現(xiàn)代通信系統(tǒng)發(fā)展的主要方向要建設(shè)一個(gè)遠(yuǎn)距離、大容量，具有較好傳輸質(zhì)量且保密性強(qiáng)的適合于現(xiàn)代社會經(jīng)濟(jì)發(fā)展的通信網(wǎng)絡(luò)。擴(kuò)頻通信以其獨(dú)有的特點(diǎn)恰好迎合了現(xiàn)代經(jīng)濟(jì)發(fā)展的需要，具有非常廣闊的應(yīng)用前景。擴(kuò)頻通信的核心思想就是利用犧牲傳輸信號帶寬的方法實(shí)現(xiàn)低信噪比條件下信號的可靠傳輸。但是擴(kuò)頻通信的一個(gè)缺點(diǎn)就是傳輸同樣的信息條件下輸送更多的比特流，并且對于信號的捕獲和解擴(kuò)過程會帶來麻煩。 本文在擴(kuò)頻通信理論的基礎(chǔ)上，，研究了擴(kuò)頻信號的捕獲方法和相關(guān)技術(shù)，并使用MATLAB工具對信號的產(chǎn)生和捕獲進(jìn)行了仿真分析。具體研究工作如下： 1.根據(jù)擴(kuò)頻通信的基本理論，研究了擴(kuò)頻信號的產(chǎn)生原理和產(chǎn)生過程，并且深入分析了軟件實(shí)現(xiàn)偽碼序列的方法（包括M序列和Gold序列）。 2.分析了擴(kuò)頻信號偽碼的自相關(guān)和互相關(guān)特性，并深入研究了偽碼同步技術(shù)。 3.針對高動態(tài)的GPS擴(kuò)頻衛(wèi)星通信信號進(jìn)行研究，掌握GPS中所使用的偽碼序列的具體碼序列，并研究了GPS接收機(jī)的接收過程。 4.在掌握了高動態(tài)擴(kuò)頻信號的完整理論的基礎(chǔ)上，深入研究了FFT擴(kuò)頻信號的快速捕獲技術(shù)，并利用MATLAB工具進(jìn)行了仿真研究。
[Abstract]:The main direction of the development of modern communication system is to build a communication network with long distance, large capacity, good transmission quality and strong confidentiality, which is suitable for the development of modern society and economy. Because of its unique characteristics, spread spectrum communication meets the needs of modern economic development and has a very broad application prospect. The core idea of spread spectrum communication is to realize the reliable transmission of signal under low SNR by sacrificing the bandwidth of transmission signal. But one of the disadvantages of spread spectrum communication is that it can transport more bit streams under the same information condition, and it will bring trouble to signal acquisition and despreading. Based on the spread spectrum communication theory, this paper studies the acquisition method and related technology of spread spectrum signal, and simulates the signal generation and acquisition with MATLAB tool. The specific research work is as follows: 1. According to the basic theory of spread spectrum communication, the generating principle and process of spread spectrum signal are studied, and the method of software realizing pseudo code sequence (including M sequence and Gold sequence) is analyzed. 2. The autocorrelation and cross-correlation characteristics of spread spectrum signal pseudo codes are analyzed, and the pseudo code synchronization technology is studied. 3. The high dynamic GPS spread spectrum satellite communication signal is studied, the specific code sequence of the pseudo code sequence used in GPS is grasped, and the receiving process of GPS receiver is studied. 4. On the basis of mastering the complete theory of high dynamic spread spectrum signal, the fast acquisition technology of FFT spread spectrum signal is deeply studied, and the simulation research is carried out by using MATLAB tool.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN914.42

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