本文選題：LTE標(biāo)準(zhǔn) + 單載波頻分多址(SC-FDMA)��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：第三代合作伙伴項(xiàng)目(the 3rd Generation Partnership Project,3GPP)提出的長(zhǎng)期演進(jìn)計(jì)劃(Long Term Evolution,LTE)引入了多方面的技術(shù)革新以增強(qiáng)無(wú)線通信系統(tǒng)的整體性能。LTE上行鏈路采用峰均比較低的單載波頻分多址技術(shù)(Single Carrier Frequency Division Multiple Access,SC-FDMA)技術(shù)。同時(shí),發(fā)送的幀結(jié)構(gòu)設(shè)計(jì)成帶有循環(huán)前綴(Cycle Prefix,CP)的形式以有效抵抗符號(hào)間干擾(Inter-Symbol Interference,ISI)和載波間干擾(Inter-Carrier Interference,ICI)。通常CP長(zhǎng)度大于信道沖激響應(yīng)的最大延遲,然而,在一些特殊的通信環(huán)境中,例如,開闊的山地、高速的列車等環(huán)境,都會(huì)造成信道響應(yīng)具有較大的時(shí)間延遲,這直接導(dǎo)致了原本的CP長(zhǎng)度不再滿足要求,導(dǎo)致傳統(tǒng)解調(diào)算法性能嚴(yán)重下降。本文基于LTE上行鏈路的SC-FDMA技術(shù),針對(duì)相關(guān)的物理層調(diào)制解調(diào)技術(shù)展開研究,本文的主要貢獻(xiàn)可以歸納為如下三個(gè)方面:1.在充分理解LTE標(biāo)準(zhǔn)的基礎(chǔ)上,著重針對(duì)上行鏈路物理層處理的相關(guān)技術(shù)細(xì)節(jié)搭建系統(tǒng)級(jí)仿真平臺(tái),平臺(tái)主要包括:基于Turbo碼的信道編碼和譯碼、SC-FDMA組幀、多徑頻偏信道模擬,接收端頻偏糾正、信道估計(jì)以及均衡補(bǔ)償?shù)人惴▽?shí)現(xiàn)。2.在CP長(zhǎng)度充足的條件下,研究并實(shí)現(xiàn)了適合LTE上行鏈路的頻偏糾正算法、信道估計(jì)算法和均衡補(bǔ)償算法。研究表明:頻偏糾正適合采用基于導(dǎo)頻和基于CP的相關(guān)算法;對(duì)于信道估計(jì),重點(diǎn)研究了最小二乘算法、最小均方誤差(Minimum Mean Square Error,MMSE)算法和基于離散傅里葉變換的估計(jì)算法,后者更具有性能優(yōu)勢(shì);對(duì)于均衡補(bǔ)償,詳盡討論了線性均衡算法、基于MMSE的殘余碼間干擾消除(MMSE-Residual ISI Cancellation,MMSE-RISIC)算法和頻域判決反饋均衡算法(Decision Feedback-Frequency Domain Equalization,DF-FDE)�；贚TE上行鏈路的仿真結(jié)果同樣表明MMSE-RISIC算法對(duì)編碼SC-FDMA系統(tǒng)的均衡補(bǔ)償性能具有明顯改善。3.在CP長(zhǎng)度不足的條件下,本部分主要針對(duì)均衡補(bǔ)償?shù)慕嵌冗M(jìn)行研究,論文:一方面,從時(shí)域均衡的角度出發(fā),基于等效信道縮短的思想,研究了最大縮短信噪比算法和基于零點(diǎn)消除的信道縮短算法以及自適應(yīng)盲均衡即冗余重構(gòu)多載波均衡算法。研究表明:信道縮短算法在SC-FDMA系統(tǒng)中的有效性并不明顯;另一方面,從頻域均衡角度,在研究了MMSE均衡算法、聯(lián)合RISIC和CP重構(gòu)的均衡算法的基礎(chǔ)上,論文提出了適用于SC-FDMA系統(tǒng)的基于最小均方誤差的判決反饋(MMSE-DFE)算法,并通過(guò)搭建的SC-FDMA鏈路仿真平臺(tái)驗(yàn)證了提出算法的有效性,在CP不足情況可以獲得更好的誤碼率性能。
[Abstract]:The 3rd Generation Partnership Project 3GPP) has introduced a number of technological innovations to enhance the overall performance of wireless communication systems. LTE uplink uses low peak-average single-carrier frequency division.Single Carrier Frequency Division Multiple access SC-FDMA.At the same time, the transmitted frame structure is designed as a form with cyclic prefix / cycle prefix (CPV) to effectively resist inter-symbol interference (ISI) and inter-carrier interference (ICI).The CP length is usually greater than the maximum delay of channel impulse response. However, in some special communication environments, such as open mountains, high-speed trains and so on, the channel response will have a large time delay.This directly leads to the original CP length no longer meet the requirements, leading to the performance of the traditional demodulation algorithm.Based on the SC-FDMA technology of LTE uplink, this paper studies the related physical layer modulation and demodulation technology. The main contributions of this paper can be summarized as follows: 1.On the basis of fully understanding the LTE standard, a system-level simulation platform is built for the related technical details of uplink physical layer processing. The platform mainly includes: Channel coding and decoding based on Turbo code, SC-FDMA framing, and multi-path frequency offset channel simulation.The received end frequency offset correction, channel estimation and equalization compensation algorithm are implemented. 2. 2.Under the condition of sufficient CP length, the frequency offset correction algorithm, channel estimation algorithm and equalization compensation algorithm suitable for LTE uplink are studied and implemented.The results show that frequency offset correction is suitable for pilot-based and CP based correlation algorithms. For channel estimation, the least square algorithm, minimum mean square error minimum Mean Square error estimation algorithm and discrete Fourier transform estimation algorithm are emphasized.The simulation results based on LTE uplink also show that the MMSE-RISIC algorithm can significantly improve the equalization compensation performance of coded SC-FDMA systems.Under the condition of the lack of CP length, this part mainly studies the equalization compensation angle. On the one hand, from the angle of time domain equalization, based on the idea of equivalent channel shortening,The maximum shortening SNR algorithm, the channel shortening algorithm based on zero cancellation and the adaptive blind equalization, i.e. redundant reconstruction multi-carrier equalization algorithm, are studied.The results show that the channel shortening algorithm is not effective in SC-FDMA system. On the other hand, from the angle of frequency domain equalization, the MMSE equalization algorithm, the equalization algorithm combining RISIC and CP reconstruction, is studied.In this paper, a decision feedback MMSE-DFE algorithm based on minimum mean square error (MSE-DFE) is proposed for SC-FDMA systems. The effectiveness of the proposed algorithm is verified by a SC-FDMA link simulation platform, and a better bit error rate performance can be obtained in the case of CP deficiency.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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