【正文】 無(wú)線(xiàn)電實(shí)驗(yàn)系統(tǒng)終端算法任務(wù)流程 ................................................................. 29 基帶算法任務(wù)分配 ..................................................................................................... 29 DSP 算法流程設(shè)計(jì) ...................................................................................................... 32 基于 DSP/BIOS 的多任務(wù)程序框架設(shè)計(jì) .................................................................. 34 實(shí)時(shí)多任務(wù)系統(tǒng)及 DSP/BIOS 簡(jiǎn)介 ................................................................... 34 基于 DSP/BIOS 的程序設(shè)計(jì)方法 ....................................................................... 36 發(fā)送 DSP 實(shí)時(shí)多任務(wù)程序框架設(shè)計(jì) ................................................................. 36 接收 DSP 實(shí)時(shí)多任務(wù)程序框架設(shè)計(jì) ................................................................. 39 本章小結(jié) ..................................................................................................................... 42 4 認(rèn)知無(wú)線(xiàn)電實(shí)驗(yàn)系統(tǒng)降低信號(hào)峰均功率比算法的研究與實(shí)現(xiàn) .................................... 43 OFDM 傳輸技術(shù)的峰均功率比問(wèn)題 .......................................................................... 43 峰均功率比定義 .................................................................................................. 43 OFDM 信號(hào)峰均功率比統(tǒng)計(jì)規(guī)律 ....................................................................... 44 高峰均功率比對(duì)認(rèn)知無(wú)線(xiàn)電系統(tǒng)造成的影響 ......................................................... 45 常見(jiàn)的降低信號(hào)峰均功率比算法比較 ..................................................................... 47 西安交通大學(xué)碩士學(xué)位論文 VI 信號(hào)預(yù)畸變技術(shù) .................................................................................................. 47 編碼類(lèi)技術(shù) .......................................................................................................... 48 概率類(lèi)技術(shù) .......................................................................................................... 48 改進(jìn)限幅濾波算法降低 OFDM 信號(hào)峰均功率比 .................................................... 49 限幅算法思想 ...................................................................................................... 49 改進(jìn)限幅算法 ...................................................................................................... 50 改進(jìn)限幅算法參數(shù)的選擇 .................................................................................. 52 改進(jìn)限幅算法仿真結(jié)果 ...................................................................................... 53 改進(jìn)限幅算法在認(rèn)知無(wú)線(xiàn)電實(shí)驗(yàn)系統(tǒng)中的實(shí)現(xiàn) ..................................................... 54 本章小結(jié) ..................................................................................................................... 56 5 認(rèn)知無(wú)線(xiàn)電終端的硬件和軟件框架測(cè)試 ........................................................................ 57 認(rèn)知無(wú)線(xiàn)電實(shí)驗(yàn)系統(tǒng)終端硬件測(cè)試 ......................................................................... 57 電源模塊測(cè)試 ...................................................................................................... 57 時(shí)鐘信號(hào)測(cè)試 ...................................................................................................... 59 高速數(shù)字信號(hào)傳輸?shù)男盘?hào)完整性測(cè)試 .............................................................. 61 認(rèn)知無(wú)線(xiàn)電實(shí)驗(yàn)系統(tǒng)軟件框架測(cè)試 ......................................................................... 62 底層硬件配置測(cè)試 .............................................................................................. 62 各算法模塊間的接口測(cè)試 .................................................................................. 63 任務(wù)時(shí)序和算法實(shí)時(shí)性測(cè)試 .............................................................................. 64 本章小結(jié) ..................................................................................................................... 64 6 結(jié)論與展望 ........................................................................................................................ 65 工作總結(jié) ..................................................................................................................... 65 后續(xù)工作及展望 ......................................................................................................... 65 致 謝 .................................................................................................................................... 66 參考文獻(xiàn) ................................................................................................................................ 67 附 錄 認(rèn)知無(wú)線(xiàn)電實(shí)驗(yàn)系統(tǒng)終端實(shí)物圖 ........................................................................ 69 攻讀學(xué)位期間取得的研究成果 ............................................................................................ 70 聲明 CONTENTS VII CONTENTS 1 Preface ....................................................................................................................................1 Reasearch Status of Cognitive Radio ..............................................................................1 Thesis Background and Brief Introduction of CR Experimental System .......................2 Main work and the Arrangement of Contents .................................................................5 2 Design and Implementation of Hardware in CR Terminals ...................................................7 Design of Hardware Framework Based On SDF ............................................................7 Circuit Design of the Base Band Processing Board ........................................................8 Selection of the Key Devices .......................................................................................9 Circuit Design of Interface .......................................................................................9 Circuit Implementation...........................................................................................13 Circuit Design and Implementation of the IF Boards ...................................................21 IF Transmitter Board ..............................................................................................21 IF Receiver Board.......