【正文】 認(rèn)知無線電實(shí)驗(yàn)終端的軟件設(shè)計(jì)和OFDM 導(dǎo)頻輔助信道估計(jì)算法的實(shí)現(xiàn) Software Design of Cognitive Radio Experimental Terminal and Implementation of OFDM PSAM Channel Estimation A thesis submitted to Xi’an Jiaotong University in partial fulfillment of the requirements for the degree of Master of Engineering Science By Kun Niu (Information and Communication Engineering) Supervisor: Associate Prof. Xinmin Luo May 20xx 摘 要 I 論文題目： 認(rèn)知無線電實(shí)驗(yàn) 終端 的 軟件設(shè)計(jì)和 OFDM 導(dǎo)頻輔助信道估計(jì) 算法 的實(shí)現(xiàn) 學(xué)科 專業(yè)： 信息與通信工程 申 請(qǐng) 人 ： 牛坤 指導(dǎo)教師： 羅新民 副教授 摘 要 ? 認(rèn)知無線電 (Cognitive Radio， CR)是一種用于提高無線通信頻譜資源利用率的技術(shù)，為了對(duì)認(rèn)知無線電的理論方法和禮儀協(xié)議進(jìn)行更深入的實(shí)驗(yàn)評(píng)估和研究 ， 項(xiàng)目組在第一版實(shí)驗(yàn)系統(tǒng)的基礎(chǔ)上， 研制了 第二版 認(rèn)知無線電實(shí)驗(yàn)系統(tǒng)。 論 文主要完成了 第二版 認(rèn)知無線電 實(shí)驗(yàn) 系統(tǒng) 中的 基帶和中頻 部分 的軟件設(shè)計(jì)，實(shí)現(xiàn)了基于 OFDM 的無線通信 功能 ， 并 在實(shí)驗(yàn) 系統(tǒng) 中實(shí)現(xiàn)了 OFDM 導(dǎo)頻輔助的 信道估計(jì) 算法 。 論文首先介紹了認(rèn)知無線電 實(shí)驗(yàn) 系統(tǒng)的設(shè)計(jì)目標(biāo)，總體結(jié)構(gòu)和性能指標(biāo)。接著介紹了實(shí)驗(yàn)終端 上 /下變頻器件和 D/A 器件的軟件配置，分析并解決了頻譜翻轉(zhuǎn)，子載波鏡像 ，高頻子載波幅度衰減等問題。 論文 設(shè)計(jì)了基帶和中頻各模塊間的 軟件 接口， 包括 接收通道下變頻器件與同步模塊 、 DSP 與同步模塊 、 DSP 與譯碼模塊間的接口， 保證數(shù)據(jù)能夠正確傳輸。然后介紹了 DSP 片內(nèi)外設(shè)的配置情況以及一些初始化配置。之后對(duì)如何提高系統(tǒng)有效數(shù)據(jù)率作了討論，列出了實(shí)現(xiàn)過程中所能達(dá)到的技術(shù)參數(shù)。 隨后 在總結(jié)常見的 OFDM 導(dǎo)頻輔助信道估計(jì)方法的基礎(chǔ)上， 論文 給出了適合實(shí)驗(yàn)系統(tǒng)的信道估計(jì)實(shí)現(xiàn)方案， 完成了算法的 DSP 實(shí)現(xiàn)，通過對(duì)程序的時(shí)間和空間復(fù)雜度 的 分析，表明 算法能夠滿足 系統(tǒng)設(shè)計(jì)的 時(shí)序要求 。 最后論文 設(shè)計(jì) 了 閉環(huán)測(cè)試程 序 ，并 在 FDD 工作方式下對(duì)誤比特 率進(jìn)行了測(cè)試 和分析，驗(yàn)證了實(shí)現(xiàn)方案能夠滿足系統(tǒng)設(shè)計(jì)的傳輸質(zhì)量要求。 論文提到的認(rèn)知無線電實(shí)驗(yàn)終端 軟件 設(shè)計(jì) 已完成并調(diào)試成功，系統(tǒng)能夠正常工作。實(shí)現(xiàn)了 OFDM 導(dǎo)頻輔助信道估計(jì)算法， 算法能夠滿足系統(tǒng)設(shè)計(jì)的時(shí)序 和傳輸質(zhì)量要求。 關(guān) 鍵 詞 ： 認(rèn)知無線電實(shí)驗(yàn)系統(tǒng) ； 正交頻分復(fù)用 ； 信道估計(jì) ； DSP 論文類型 ： 應(yīng)用研究 ?本研究得到國家高技術(shù)研究發(fā)展計(jì)劃（“ 863”計(jì)劃）項(xiàng)目（編號(hào)： 20xxAA123940） 。陜西省自然科學(xué)基金 資助項(xiàng)目（ 20xxF41）；陜西省科技攻關(guān)計(jì)劃項(xiàng)目（ 20xxK04G11）資助。 西安交通大學(xué)碩士學(xué)位論文 ABSTRACT III Title: Software Design of Cognitive Radio Experimental Terminal and Implementation of OFDM PSAM Channel Estimation Speciality: Information and Communication Engineering Applicant: Kun Niu Supervisor: Associate Prof. Xinmin Luo ABSTRACT? Cognitive Radio is a smart technology used to improve the utilization of spectrum order to verify not only the theory of Cognitive Radio technology, but also the etiquette and protocol of Cognitive Radio, we designed a new cognitive radio experimental system.. This thesis mainly focuses on software design of the baseband and IF of the receiving module,the implementation of wireless munication of the second edition CR experimental system and the implementation of OFDM channel estimation based on the second edition CR experimental system. The content of the thesis can be summarized as follows:Firstly,design object,total stucture,and parameters of CR experimental system were ,the software configuration of IF devices was introduced,then the thesis analysized the reasons of spectrum flip,subcarrier mirror, highfrequency attenuation of design of interfaces between modules of baseband and IF,such as the interface between receiving module and sync module,the interface beween DSP and sync module and the interface between DSP and decoding module,was these interfaces data can be transmitted the configuration of DSP was the thesis discussed how to improve the data , on the basis of the introduction of mon OFDM PSAM channel estimation,the thesis introduced an implementation method of channel estimation for the CR experimental system and pleted the DSP implementation of the algorithm. The time and space plexity of the algorithm was result is that the algorithm can meet the timing the closedloop test program,the BER was tested and result is that the method can match the transmission quality requirements of the system. Software design of CR terminal has already been system can work implementation has already been finished too,and the conclusion that the algorithm can match the timing and quality requirements of the system is made. KEY WORDS: Cognitive radio experimental system。 OFDM。 Channel estimation。 DSP TYPE OF THESIS: Applied Research ? Funded by“ The research was supported by the Hitech Rearch and Development Program of China (“863”Plan)()“ ,“ The Nature Science Fundation of Shaanxi Province()” , “ The Science and Technology Plan Foundation of Shaanxi Province()” . 西安交通大學(xué)碩士學(xué)位論文 IV 目 錄 V 目 錄 1 緒論 ...................................................................................................................................... 1 選題意義及應(yīng)用背景 ................................................................................................... 1 國內(nèi)外研究現(xiàn)狀分析 ................................................................................................... 1 本文研究的主要工作和結(jié)構(gòu)安排 ............................................................................... 3 2 認(rèn)知無線電系統(tǒng)概述 .......................................................................................................... 5 認(rèn)知無線電系統(tǒng)的設(shè)計(jì)目標(biāo) ....................................................................................... 5 認(rèn)知無線電實(shí)驗(yàn)系統(tǒng)的總體結(jié)構(gòu) ............................................................................... 5 認(rèn)知無線電實(shí)驗(yàn)系統(tǒng)的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu) ................................................................ 5 認(rèn)知無線電終端 .................................................................................................... 6 認(rèn)知無線電實(shí)驗(yàn)系統(tǒng)參數(shù) .................................................................................... 7 本章小結(jié) ....................................................................................................................... 8 3 認(rèn)知無線電實(shí)驗(yàn)終端中頻和基帶模塊的軟件設(shè)計(jì) .......................................................... 9 中頻器件的配置 ........................................................................................................... 9 發(fā)送模塊中頻器件的配置 .................................................................................... 9 接收模塊中頻器件的配置 .................................................................................. 14 基帶和中