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本科生畢業(yè)設(shè)計(jì) 題目 ( 中文 ) : 可變速率調(diào)制技術(shù)研究 ( 英文 ) : The Study of Variable Rate Modulation 目 錄 摘 要 ..................................................................................................................... I 關(guān)鍵 字 ..................................................................................................................... I Abstract................................................................................................................. I Keywords............................................................................................................... II 第一章 緒論 ................................................................................................................ 1 課題背景及意義 ............................................................................................. 1 國內(nèi)外研究現(xiàn)狀分析 ..................................................................................... 1 本文的研究內(nèi)容 ............................................................................................. 2 第二章 可變速率調(diào)制技術(shù)的理 論基礎(chǔ) ...................................................................... 3 數(shù)字調(diào)制技術(shù)的要求及性能指標(biāo) ................................................................. 3 移動(dòng)通信的數(shù)字調(diào)制技術(shù)要求 .......................................................... 3 數(shù)字調(diào)制技術(shù)的性能 指標(biāo) .................................................................. 3 可變速率調(diào)制技術(shù)的原理和實(shí)現(xiàn)方式 ......................................................... 4 實(shí)現(xiàn)可變速率調(diào)制的方法 ............................................................................. 5 第三章 可變速率調(diào)制技術(shù)的實(shí)現(xiàn)方法 .................................................................... 7 MCCDMA........................................................................................................... 7 MCCDMA 的基本原理及實(shí)現(xiàn)方法 ..................................................... 7 MCCDMA 的優(yōu)缺點(diǎn) ........................................................................... 11 VSGCDMA....................................................................................................... 12 VSGCDMA 的理論基礎(chǔ) ....................................................................... 12 VSGCDMA 性能分析 ........................................................................... 13 VRQAM........................................................................................................... 14 VRQAM 基本原理 ............................................................................... 14 VRQAM 的性能 ................................................................................... 17 可變速率調(diào)制技術(shù)在我國 3G 中的應(yīng)用 ..................................................... 18 第四章 總結(jié)與展望 .................................................................................................. 20 參考文獻(xiàn) ...................................................................................................................... 21 致謝 .............................................................................................................................. 22 I 可變速率調(diào)制技術(shù)研究 摘 要 : 未來移動(dòng)通信系統(tǒng)不僅要傳輸不同速率和不同質(zhì)量要求的多種業(yè)務(wù),而且因?yàn)橐苿?dòng)信道的傳播性能經(jīng)常會(huì)隨時(shí)間和傳播地點(diǎn)而隨機(jī)變化,所以移動(dòng)通信系統(tǒng)必須具有自適應(yīng)改變其傳輸速率的能力,以便能靈活地為多種業(yè)務(wù)提供合適的傳輸速率,而且能在保證傳輸質(zhì)量的前提下,根據(jù)傳播條件實(shí)時(shí)地調(diào)整其傳輸速率 (信道條件好,提高速率;信道條件差,降低速率 ),以充分發(fā)揮所用頻譜的效率。因此 , 在移動(dòng)通信系統(tǒng)中最好能利用可變速率調(diào)制技術(shù),根據(jù)移動(dòng)信道的變化自適應(yīng)地改變無線傳輸速率 ,這樣才能有效地增加對(duì)衰落信道的適應(yīng)能力??勺兯俾收{(diào)制技術(shù)就是一種與基本調(diào)制方式相結(jié)合的傳輸控制方法 , 實(shí)質(zhì)上就是一種自適應(yīng)調(diào)制技術(shù) , 能根據(jù)移動(dòng)信道隨機(jī)變化的情況自適應(yīng)地改變無線傳輸速率 , 亦即當(dāng)信道條件好時(shí)增加傳輸速率 , 當(dāng)信道條件差時(shí)降低傳輸速率。它可以在頻譜效率和系統(tǒng)誤碼性能兩方面都達(dá)到令人滿意的效果。本文研究可變速率調(diào)制技術(shù)的基本原理,以及可變速率的三種主要實(shí)現(xiàn)方法(多載波碼分 多址、可變?cè)鲆娲a分多址、變速率正交幅度調(diào)制)做簡要介紹。 關(guān)鍵 字 :自適應(yīng)調(diào)制技術(shù); MCCDMA; VRQAM; VSGCDMA The Study of Variable Rate Modulation Abstract: The future mobile munication system is not only to transmit signal with different transmission rates and quality requirements, but also has to be adaptive to change its transmission rate as the spread performance of mobile channel witch often autoadapt changed as time and locations, So that it can freely provide a suitable transmission rates to variety of business, and adjust its transmission rate to realtime dissemination of the conditions under the condition of ensuring the transmission quality(a good channel condition to higth rate。 a poor channel condition to low rate) so as to show full efficiency of frequent spectrum. Therefore, in the mobile munications system, it’s a good choice to use variablerate modulation technology in accordance with changes in mo