【摘要】：隨著人們對通信行業(yè)高質(zhì)量、高效率、多媒體業(yè)務(wù)需求的日益增長,無線通信系統(tǒng)中頻帶利用率提高以及系統(tǒng)容量提升的必要性越來越突出。而MIMO-OFDM技術(shù)正是B3G、4G乃至5G通信中都會發(fā)揮此重要作用的一種數(shù)據(jù)傳輸解決方案,一直以來被當(dāng)成通信領(lǐng)域研究的熱點。而MIMO-OFDM系統(tǒng)的信道估計技術(shù)又是系統(tǒng)實現(xiàn)良好通信的至關(guān)重要的環(huán)節(jié),其信道估計性能的好壞直接影響系統(tǒng)的信息傳輸質(zhì)量。本文主要的研究內(nèi)容就是MIMO-OFDM系統(tǒng)的信道估計技術(shù)。首先,本文介紹了無線移動通信技術(shù)的發(fā)展過程,簡單概括了目前信道估計技術(shù)的方法分類以及MIMO-OFDM系統(tǒng)信道估計技術(shù)的發(fā)展背景。研究分析了無線通信中的幾種常用信道模型以及MIMO技術(shù)、OFDM技術(shù)、MIMO-OFDM系統(tǒng)的基本原理和特征。其次,本文就MIMO-OFDM系統(tǒng)的核心技術(shù)信道估計技術(shù)進行了詳細的討論和分析。介紹了幾種常用的導(dǎo)頻插入方式,對MIMO-OFDM系統(tǒng)的LS時域、頻域信道估計技術(shù)作了比較詳盡的介紹,并給出其軟件仿真結(jié)果。針對LS信道估計技術(shù)的弱點,本文又介紹了MMSE技術(shù)以及其改進的LMMSE技術(shù),給出仿真結(jié)果與理論分析。最后,在以上理論知識以及算法支持的基礎(chǔ)上,結(jié)合本人在實驗室的科研實踐,給出了MIMO-OFDM系統(tǒng)收發(fā)端整體的SYSTEM GENERATOR的硬件仿真模型搭建,并對系統(tǒng)中的每個功能模塊進行測試以及波形觀察。
[Abstract]:With the increasing demand for high quality, high efficiency and multimedia services in the communication industry, the necessity of improving the frequency band efficiency and the capacity of the wireless communication system is becoming more and more prominent. MIMO-OFDM technology is a kind of data transmission solution which will play an important role in B3GN 4G and even 5G communication. It has always been regarded as a hot research topic in the field of communication. The channel estimation technology of MIMO-OFDM system is the most important link to achieve good communication. The performance of channel estimation directly affects the quality of information transmission. The main research content of this paper is the channel estimation technology of MIMO-OFDM system. Firstly, this paper introduces the development of wireless mobile communication technology, briefly summarizes the classification of current channel estimation techniques and the background of channel estimation technology in MIMO-OFDM systems. Several common channel models in wireless communication and the basic principles and characteristics of MIMO-OFDM system based on MIMO technology are studied and analyzed. Secondly, the channel estimation technology of MIMO-OFDM system is discussed and analyzed in detail. In this paper, several common pilot insertion methods are introduced. The LS time-domain and frequency-domain channel estimation techniques for MIMO-OFDM systems are introduced in detail, and the software simulation results are given. Aiming at the weakness of LS channel estimation technology, this paper introduces the MMSE technology and its improved LMMSE technology, and gives the simulation results and theoretical analysis. Finally, on the basis of the above theoretical knowledge and algorithm support, combined with my scientific research practice in the laboratory, the hardware simulation model of the whole SYSTEM GENERATOR in the transceiver of MIMO-OFDM system is presented. Each function module of the system is tested and the waveform is observed.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.53

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