【摘要】：隨著人們對無線通信技術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)境也變得越來越復雜。新的無線通信技術必須要有更快的傳輸速率、更大的網(wǎng)絡容量以及更高的可靠性。MIMO(Multiple-Input Multiple-Output)技術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,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)標準IEEE802.11n協(xié)議在傳統(tǒng)協(xié)議的基礎上采用了MIMO技術,將傳輸速率由54Mb/s提升至300Mb/s。本文主要在MIMO技術分析的基礎上深入研究了802.11n協(xié)議,設計了一個4*4MIMO的完整通信鏈路,并在WARP上搭建了一個基于真實的無線信道環(huán)境的驗證平臺。本文首先對IEEE802.11n協(xié)議的做了一個基本的介紹。闡述了802.11n協(xié)議的特點和優(yōu)勢,就802.11n協(xié)議的關鍵技術:向前糾錯編碼、短保護間隔、最大合并比和信道捆綁給出了詳細的說明。在802.11n協(xié)議的基礎上,分析了MIMO技術和OFDM技術的原理,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:信道估計、空時編碼和MIMO信號檢測的原理。并對各技術中的不同算法進行了仿真分析,對比了在不同信噪比(SNR)情況下的誤碼率(BER)�；贗EEE802.11n協(xié)議,本文設計了一個4*4MIMO的完整通信鏈路,對整個系統(tǒng)模型進行了模塊化劃分。發(fā)射端的主要模塊有調(diào)制、導頻信號、空時編碼、天線映射、快速傅里葉逆變換和加循環(huán)前綴,然后發(fā)送的信號經(jīng)過無線信道到達接收端,接收端對接收到的信號進行逆向解碼,主要分析的模塊有MIMO檢測和解調(diào),并對整個鏈路在MATLAB上進行了仿真分析。本文在最后針對真實的無線信道環(huán)境,基于WARP搭建了一個實時通信協(xié)議的仿真平臺,驗證了前面設計的4*4MIMO系統(tǒng)性能,并進行了真實的視頻傳輸。
[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.
【學位授予單位】：國防科學技術大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN919.3

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