【正文】 超寬帶調(diào)制技術(shù)研究 [畢業(yè)論文 ] 目錄 摘要 ...................................................................................................................................................1 ABSTRACT........................................................................................................................................3 第一章 緒論 .......................................................................................................................................4 超寬帶的概念 ........................................................................................................................4 超寬帶的技術(shù)特點(diǎn) .................................................................................................................4 超寬帶技術(shù)的優(yōu)勢(shì) ...................................................................................................... 4 超寬帶技術(shù)的劣勢(shì) ....................................................................................................... 5 目前國(guó)內(nèi)外在超寬帶通信領(lǐng)域的研究和開發(fā)現(xiàn)狀 ...................................................................6 論文的主要內(nèi)容 ....................................................................................................................8 第二章 UWB 無線電通信系統(tǒng)概述 .....................................................................................................9 UWB 通信基本原理 ................................................................................................................9 UWB 系統(tǒng)基本結(jié)構(gòu) .............................................................................................................. 10 功率限制和輻射掩蔽 ........................................................................................................... 11 UWB 系統(tǒng)的廣泛應(yīng)用 .......................................................................................................... 13 第三章 UWB 系統(tǒng)的調(diào)制技術(shù) .......................................................................................................... 15 UWB 調(diào)制方式概述 .............................................................................................................. 15 跳時(shí)脈位調(diào)制 THPPM ...............................................................................................15 脈幅調(diào)制 PAM............................................................................................................16 二相調(diào)制 BPSK .........................................................................................................17 開關(guān)鍵控 OOK...........................................................................................................18 偽混沌跳時(shí)調(diào)制 PCTH ...............................................................................................18 M 狀態(tài) Walsh 碼調(diào)制 ..................................................................................................18 基本解調(diào)方法概述 ................................................................................................................ 19 包絡(luò)檢測(cè) ...................................................................................................................19 相關(guān) /匹配濾波器接收 ..................................................................................................19 RAKE 接收 .................................................................................................................20 差分相干 ...................................................................................................................20 1 第四章 PPMUWB 與 BPSKUWB 調(diào)制技術(shù)的仿真 ........................................................................... 21 PPMUWB 仿真與分析 ......................................................................................................... 21 BPSKUWB 仿真與分析 ....................................................................................................... 25 第五章 總結(jié) ..................................................................................................................................... 35 致謝 ...................................................................................................................... 錯(cuò)誤 !未定義書簽。 參考文獻(xiàn) .......................................................................................................................................... 36 摘要 超寬帶 （ UWB） 脈沖通信是一種與其它技術(shù)有很大不同的無線通信技術(shù) ,它具有通信容量大、輻射功率密度低、抗多徑干擾、 結(jié)構(gòu)簡(jiǎn)單和保密性好等優(yōu)點(diǎn)。利用 UWB 脈沖通信是對(duì)無線頻譜資源的利用進(jìn)行新的探索，它解決了困擾傳統(tǒng)無線技術(shù)多年的有關(guān) 傳播方面的重大問題。這項(xiàng)新興技術(shù)對(duì)方興未艾的無線接入技術(shù)是一個(gè)有力的支持，因此需要深入研究并掌握這項(xiàng)技術(shù)。 為了更好地了解超寬帶通信系統(tǒng)，本文先概括地介紹了超寬帶無線通信的基礎(chǔ)知識(shí)，比如超寬帶通信的基本原理、超寬帶的基本脈沖波形以及超寬帶信號(hào)的調(diào)制技術(shù)等等。本文著重分析了 跳時(shí)脈位 調(diào)制 THPPM、脈幅調(diào)制 PAM、二相調(diào)制 BPSK、開關(guān)鍵控 OOK、偽混沌跳時(shí)調(diào)制 PCTH 和 M 狀態(tài) Walsh 碼調(diào)制及基本解調(diào)方法，并且介紹了這些調(diào)制方法的特點(diǎn) 。在有了上述理論依據(jù)的基礎(chǔ)上，就可以通過 MATLAB 軟件進(jìn)行仿真，以此來驗(yàn)證理論的正確性。 本文主要對(duì) PPM 和 BPSK 進(jìn)行了仿真，對(duì)已調(diào)信號(hào)的功率譜進(jìn)行了分析。 關(guān)鍵字： 超寬帶 脈沖位置調(diào)制 二相調(diào)制 功率譜 2 3 ABSTRACT UltraWideband (UWB) pulse munication is a very different munication technique from others. It has characteristics of high system capacity, low power spectral densities, exception multipath immunity, simple structure and low probability of detection. The UWB pulse munication is a new exploration of radio spectrum, and it resolves the important problem of radio propagation. For its strong support to wireless input, we should study it. In order to understand UWB telemunication better, the basis knowledge of UWB wireless munication is introduced in the first of this dissertation, such as the theory of UWB, basis impulse waveform, modulation technology of UWB and so on. This dissertation analyses the mothods of THPPM, PAM, BPSK, OOK, PCTH and M state Walsh code modulation, and introduces the basic characteristics of the modulation method. In the above theory basis, through the MATLAB software can be simulated, in order to verify the correctness of the theory. This dissertation focuses on the simulations of PPM and BPSK, and analyzes the power spectrum about the modulated signal. Keywords: UWB PPM BPSK Power Spectrum 4 第一章 緒論 近年來，超寬帶 （ UWB, UltraWideband）