本文主要研究无线OFDM系统中的信道估计算法，包括基于导频辅助信道估计算法和信道盲估计算法。
This thesis mainly focuses on the algorithms for channel estimation in the wireless OFDM systems including pilot assisted channel estimation and channel blind estimation.
信道估计器通常分为两类：判决反馈估计器和导频符号辅助估计器。
Channel estimators are usually divided into two kind: decision-feedback estimator and pilot-aided estimator.
有一种直接基于DFT的信道估计方法利用均匀梳状分布的导频符号和离散傅立叶变换（DFT）完成信道估计。
The direct DFT based channel estimation method uses comb-type pilot symbol and discrete Fourier transform (DFT) to estimate the channel.
根据最优化训练序列的设计方法分别讨论了两种最优化训练序列的导频格式：对角正交导频和相移正交导频，分析了在两种不同导频格式下的信道估计算法。
The channel estimation algorithm based on training-sequence method firstly introduces the definition of the training sequence and discusses the optimum training-sequence in MIMO-OFDM system.
基于导频的信道估计方法已经受到广泛的研究，主要估计算法有最小二乘法(LS)、最小均方误差法(MMSE)和最大似然(ML)估计法等。
The channel estimation method based on pilots has received much research. It adopts the algorithms such as least squares (LS), minimum mean square error (MMSE), maximum likelihood (ML), and so on.
本文提出一种基于导频辅助、多项式近似和信号重建的信道估计通用方法，适用于高速移动环境。
A method based on assisted pilot and polynomial model is proposed for high speed mobile environment.
最后利用前导和判决反馈导频估计的结果联合完成信道估计。
And then the whole channel estimation is accomplished by channel estimation results of preamble training sequences and decision feedback pilots.
本论文对MIMO - OFDM系统物理层的若干关键理论和技术进行了深入研究，包括：信道估计、专用导频设计等问题。
This dissertation focused on MIMO-OFDM system and made a thorough research on the key theories and technologies including channel estimation and dedicated reference signal design.
从理论上分析了该算法所能达到的信道估计误差下限和比特误码率下限，并提出了最优叠加导频序列的设计准则。
Theoretical results of the lower bound of the bit error rate as well as the channel estimation error of the proposed algorithm were given.
同时，针对梳状导频ls信道估计精度较低的情况，提出了通过时域低通滤波提高其估计精度的IPF -LS和IDF - LS改进算法。
Meanwhile, given the weak accuracy of LS algorithm, IPF-LS and IDF-LS are proposed which can enhance the accuracy of channel estimation by employing time-domain low-pass filter.
首先介绍了单天线系统下的信道估计方法，包括基于训练序列，导频的估计算法和LS估计算法。
It introduces the estimation algorithms of single-antenna system, including training sequences, pilots estimation and LS estimation at the beginning.
首先讨论了SISO - OFDM系统的信道估计方法：面向判决的信道估计和基于导频的信道估计。
First, the channel estimation technique in SISO-OFDM system is investigated, with the emphasis on decision-directed channel estimation methods and pilot-symbol-aided channel estimation methods.
首先讨论了SISO - OFDM系统的信道估计方法：面向判决的信道估计和基于导频的信道估计。
First, the channel estimation technique in SISO-OFDM system is investigated, with the emphasis on decision-directed channel estimation methods and pilot-symbol-aided channel estimation methods.
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