發(fā)布時(shí)間：2018-11-19 08:25

【摘要】：隨著人們對(duì)無線通信技術(shù)的依賴和需求越來越高,原本有限的頻譜資源日益捉襟見肘,無線傳輸環(huán)境也變得越來越復(fù)雜。新的無線通信技術(shù)必須要有更快的傳輸速率、更大的網(wǎng)絡(luò)容量以及更高的可靠性。MIMO(Multiple-Input Multiple-Output)技術(shù)作為一種通過采用多根發(fā)射、接收天線從而做到在無線信道中產(chǎn)生多條并行數(shù)據(jù)通道的技術(shù),在不需要額外頻段的情況下極大的提高了系統(tǒng)的傳輸速率和通信質(zhì)量。新一代無線局域網(wǎng)標(biāo)準(zhǔn)IEEE802.11n協(xié)議在傳統(tǒng)協(xié)議的基礎(chǔ)上采用了MIMO技術(shù),將傳輸速率由54Mb/s提升至300Mb/s。本文主要在MIMO技術(shù)分析的基礎(chǔ)上深入研究了802.11n協(xié)議,設(shè)計(jì)了一個(gè)4*4MIMO的完整通信鏈路,并在WARP上搭建了一個(gè)基于真實(shí)的無線信道環(huán)境的驗(yàn)證平臺(tái)。本文首先對(duì)IEEE802.11n協(xié)議的做了一個(gè)基本的介紹。闡述了802.11n協(xié)議的特點(diǎn)和優(yōu)勢(shì),就802.11n協(xié)議的關(guān)鍵技術(shù):向前糾錯(cuò)編碼、短保護(hù)間隔、最大合并比和信道捆綁給出了詳細(xì)的說明。在802.11n協(xié)議的基礎(chǔ)上,分析了MIMO技術(shù)和OFDM技術(shù)的原理,并給出了MIMO+OFDM系統(tǒng)模型。其次,分析了802.11n協(xié)議中的三種MIMO技術(shù):信道估計(jì)、空時(shí)編碼和MIMO信號(hào)檢測(cè)的原理。并對(duì)各技術(shù)中的不同算法進(jìn)行了仿真分析,對(duì)比了在不同信噪比(SNR)情況下的誤碼率(BER)�；贗EEE802.11n協(xié)議,本文設(shè)計(jì)了一個(gè)4*4MIMO的完整通信鏈路,對(duì)整個(gè)系統(tǒng)模型進(jìn)行了模塊化劃分。發(fā)射端的主要模塊有調(diào)制、導(dǎo)頻信號(hào)、空時(shí)編碼、天線映射、快速傅里葉逆變換和加循環(huán)前綴,然后發(fā)送的信號(hào)經(jīng)過無線信道到達(dá)接收端,接收端對(duì)接收到的信號(hào)進(jìn)行逆向解碼,主要分析的模塊有MIMO檢測(cè)和解調(diào),并對(duì)整個(gè)鏈路在MATLAB上進(jìn)行了仿真分析。本文在最后針對(duì)真實(shí)的無線信道環(huán)境,基于WARP搭建了一個(gè)實(shí)時(shí)通信協(xié)議的仿真平臺(tái),驗(yàn)證了前面設(shè)計(jì)的4*4MIMO系統(tǒng)性能,并進(jìn)行了真實(shí)的視頻傳輸。
[Abstract]:With the increasing dependence and demand on wireless communication technology, the original limited spectrum resources are increasingly stretched, and the wireless transmission environment is becoming more and more complex. New wireless communication technologies must have faster transmission rates, greater network capacity, and higher reliability. MIMO (Multiple-Input Multiple-Output) technology as a means of using multiple transmissions. The technology of receiving antennas to generate multiple parallel data channels in wireless channels greatly improves the transmission rate and communication quality of the system without requiring additional frequency bands. The new standard IEEE802.11n protocol of WLAN adopts MIMO technology on the basis of traditional protocol, which improves the transmission rate from 54Mb/s to 300MB / s. Based on the analysis of MIMO technology, this paper deeply studies 802.11n protocol, designs a complete communication link of 4*4MIMO, and builds a verification platform based on real wireless channel environment on WARP. This paper firstly introduces the IEEE802.11n protocol. The characteristics and advantages of 802.11n protocol are described. The key technologies of 802.11n protocol are described in detail, such as forward error correction coding, short protection interval, maximum combining ratio and channel binding. Based on 802.11n protocol, the principle of MIMO and OFDM is analyzed, and the MIMO OFDM system model is given. Secondly, the principles of channel estimation, space-time coding and MIMO signal detection are analyzed. The different algorithms of each technique are simulated and analyzed, and the bit error rate (BER).) under different SNR (SNR) is compared. Based on IEEE802.11n protocol, a complete communication link of 4*4MIMO is designed, and the whole system model is divided into modules. The main modules of the transmitter are modulation, pilot signal, space-time coding, antenna mapping, FFT and cyclic prefix, and then the transmitted signal reaches the receiver via the wireless channel. The receiver decodes the received signal in reverse, the main analysis module is MIMO detection and demodulation, and the whole link is simulated on MATLAB. Finally, aiming at the real wireless channel environment, a real-time communication protocol simulation platform based on WARP is built, which verifies the performance of the 4*4MIMO system designed before and carries out the real video transmission.
【學(xué)位授予單位】：國(guó)防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN919.3

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 李蓉;無線通信中的MIMO技術(shù)[J];中國(guó)數(shù)據(jù)通信;2005年02期

2 陳睿;陳金鷹;;MIMO技術(shù)在無線校園網(wǎng)的研究與應(yīng)用[J];通信與信息技術(shù);2011年02期

3 ;華為攜手M1發(fā)布亞太首個(gè)采用MIMO技術(shù)的HSPA+網(wǎng)絡(luò)[J];移動(dòng)通信;2009年20期

4 丁志剛;;無線通信系統(tǒng)中的閉環(huán)MIMO技術(shù)[J];電信網(wǎng)技術(shù);2008年03期

5 鮑誠(chéng);;利用MIMO技術(shù)實(shí)現(xiàn)多車道的ETC系統(tǒng)[J];福建電腦;2007年09期

6 ;[J];;年期

相關(guān)重要報(bào)紙文章 前2條

1 ;大唐移動(dòng)：3D MIMO技術(shù)[N];通信產(chǎn)業(yè)報(bào);2014年

2 大唐電信集團(tuán);大唐移動(dòng)布局TD-LTE多天線技術(shù)領(lǐng)域，，推動(dòng)3D MIMO技術(shù)發(fā)展[N];中國(guó)電子報(bào);2014年

相關(guān)碩士學(xué)位論文 前5條

1 肖帥芳;室內(nèi)可見光通信中的MIMO技術(shù)研究[D];解放軍信息工程大學(xué);2014年

2 陶麗娟;分層異構(gòu)多小區(qū)分布式大規(guī)模MIMO技術(shù)研究[D];東南大學(xué);2016年

3 魏亞軍;基于MIMO技術(shù)的IEEE802.11n協(xié)議研究與實(shí)現(xiàn)[D];國(guó)防科學(xué)技術(shù)大學(xué);2014年

4 藺琳;LTE/LTE-Advanced中導(dǎo)頻設(shè)計(jì)與MIMO技術(shù)的仿真研究[D];北京郵電大學(xué);2011年

5 徐朝凱;基于有限反饋的多用戶MIMO技術(shù)研究[D];上海交通大學(xué);2010年

本文編號(hào)：2341687