本文選題：高速鐵路 + 無線寬帶接入　； 參考：《西南交通大學》2014年碩士論文

【摘要】：近年來,我國的高鐵事業(yè)發(fā)展得如火如荼,高鐵時速的不斷提升給高速鐵路通信提出了更高的要求,配合當下第四代公眾通信網(wǎng)絡(4G)的普及,應用于高速鐵路車地通信的高速無線寬帶通信系統(tǒng)的研究成為當下的熱點。在由列車高速運動導致的快時變信道條件下,準確的信道估計技術將變得更為重要,特別是以MIMO-OFDM為核心的LTE通信系統(tǒng)。本設計主要研究移動臺高速移動環(huán)境下基于導頻的信道估計技術。 論文首先介紹了無線移動通信系統(tǒng)的信道特性以及信道的時間色散和頻率色散參數(shù),并介紹了基于這兩種參數(shù)的快慢衰落和頻率選擇性衰落的劃分依據(jù)。分析了高速鐵路環(huán)境下移動通信系統(tǒng)面臨的挑戰(zhàn)和發(fā)展機遇,介紹了作為LTE核心技術的OFMD和MIMO技術的基本原理。 接下來依據(jù)3GPP鏈路層協(xié)議的部分內容搭建了下行鏈路MIMO-OFDM系統(tǒng),仿真驗證了2發(fā)2收天線STBC-OFDM系統(tǒng)相比SISO-OFDM的性能提升。在此基礎上研究了導頻信號的序列與插入方式,實現(xiàn)了基于gold序列和Zadoff-Chou序列的導頻圖案性能對比。重點研究了當前主流的幾種信道估計方法,包括LS、LMMSE以及SVD-LMMSE算法,并討論了接收端SNR估計誤差對信道估計性能的影響。研究了數(shù)據(jù)位置的插值算法,包括線性插值算法、二階多項式插值算法和三次樣條插值算法,并在此基礎上進行了性能仿真,重點比較了在不同時延下的信道中,不同插值算法在一個LTE子幀中的誤碼性能。 在快時變的信道估計中采用了BEM算法來進行時域信道擬合,首先介紹了常見的幾種BEM算法,討論并仿真了多普勒頻移和BEM階數(shù)對不同BEM算法信道擬合性能的影響。分析了在快時變信道下的子載波干擾的產(chǎn)生以及分簇導頻的使用并在仿真中實現(xiàn),在此基礎上分析了基于BEM算法的信道估計原理,并給出了基于MIMO-OFDM系統(tǒng)的CE-BEM和DPS-BEM信道估計性能仿真分析。
[Abstract]:In recent years, the high-speed rail industry in our country has been developing in full swing, and the constant increase in the speed of high-speed rail has put forward higher requirements for high-speed railway communications, in line with the popularization of the current fourth-generation public communications network (4G).The research of high-speed wireless broadband communication system for high-speed railway vehicle-ground communication has become a hot spot.Under the condition of fast time-varying channel caused by the high speed movement of train, the accurate channel estimation technology will become more important, especially the LTE communication system with MIMO-OFDM as the core.This design mainly studies the channel estimation technology based on pilot in mobile station high speed mobile environment.This paper first introduces the channel characteristics of wireless mobile communication system and the time dispersion and frequency dispersion parameters of the channel, and introduces the dividing basis of fast and slow fading and frequency selective fading based on these two parameters.This paper analyzes the challenges and development opportunities of mobile communication system in high-speed railway environment, and introduces the basic principles of OFMD and MIMO technology, which are the core technologies of LTE.Then the downlink MIMO-OFDM system is built according to the part of the 3GPP link layer protocol. The simulation results show that the performance of the 2 transmit and 2 receive antenna STBC-OFDM system is better than that of the SISO-OFDM system.On this basis, the pilot signal sequence and insertion mode are studied, and the performance comparison of pilot pattern based on gold sequence and Zadoff-Chou sequence is realized.Several popular channel estimation methods, including LSS-LMMSE and SVD-LMMSE algorithm, are studied in detail, and the influence of receiver SNR estimation error on channel estimation performance is discussed.The interpolation algorithms of data location, including linear interpolation algorithm, second-order polynomial interpolation algorithm and cubic spline interpolation algorithm, are studied.Error performance of different interpolation algorithms in a LTE subframe.In the fast time-varying channel estimation, BEM algorithm is used for channel fitting in time domain. Firstly, several common BEM algorithms are introduced, and the effects of Doppler shift and BEM order on channel fitting performance of different BEM algorithms are discussed and simulated.The generation of subcarrier interference and the use of cluster pilots in fast time-varying channels are analyzed and implemented in simulation. Based on this, the principle of channel estimation based on BEM algorithm is analyzed.Simulation analysis of CE-BEM and DPS-BEM channel estimation performance based on MIMO-OFDM system is given.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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本文編號：1735445