可變速率調(diào)制技術(shù)研究畢業(yè)設(shè)計(jì)論文(已修改)
2025-07-08 01:57 本頁(yè)面
【正文】 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 IAbstract IKeywords II第一章 緒論 1 課題背景及意義 1 國(guó)內(nèi)外研究現(xiàn)狀分析 1 本文的研究?jī)?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(guó)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 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(jiǎn)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 mobile channel, in order to effectively increase the fading channel adaptability. Variablerate modulation technique is a bination of the basic modulation methods of transmission control, In essence, is a kind of adaptive modulation technology, it can adaptively change its transfer rate with random changes in the mobile channel, that is, when the channel conditions are good increase in transfer rate, when the channel conditions are poor lower transmission rate. It can conduct satisfactory results both in error spectrum efficiency and system performance. In this paper, the basic principles of variablerate modulation technology were stated and a brief introduction was made on the main methods(multicarrier code division multiple access, variable gain code division multiple access, variablerate quadrature amplitude modulation) . Keywords: Adaptive modulation technique MCCDMA VSGCDMA VRQAM23第一章 緒論 課題背景及意義調(diào)制就是把要傳輸?shù)男畔?shù)據(jù)（或信息信號(hào)）進(jìn)行處理，使其變?yōu)檫m合于信道傳輸?shù)男盘?hào)形態(tài)的過程。一般來說，就是把信息基帶信號(hào)變?yōu)檫m合傳輸?shù)母哳l帶通信號(hào)的處理過程。調(diào)制是各種通信系統(tǒng)必不可少的最基本內(nèi)容，但不同的通信系統(tǒng)和通信環(huán)境有不同的調(diào)制和解調(diào)技術(shù)。調(diào)制解調(diào)技術(shù)的性能常用它的功率效率帶寬效率來衡量。無線通信是通信條件和通信環(huán)境最苛刻、
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