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.
无线OFDM系统中基于导频辅助的信道估计必须折衷考虑算法性能与算法复杂度。
The tradeoff between performance and complexity must be taken into account in channels estimation algorithm of wireless OFDM systems.
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.
该文对MIMO - OFDM系统中基于导频辅助的LMMSE信道估计算法进行了研究，导出了其估计均方差的下界。
The LMMSE channel estimation algorithms based on Pilot-Assisted is investigated for MIMO-OFDM systems, and the Low-Bound of MSE for LMMSE channel estimation is derived.
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.
根据算法的特点，信道估计可大致分为三类：基于导频辅助的估计、盲估计、半盲估计。
According to the characteristics of various algorithms, we can classify them into three types: pilot-assisted channel estimation, blind and semi-blind estimation.
其次，讨论了两跳单中继多载波协同通信系统的信道估计的问题，主要是基于辅助块状导频的方法；
Second, channel estimation algorithms of two-hop OFDM cooperative communication system with single relay are discussed, which are mainly based on block pilot.
它使用改进的部分并行干扰消除算法实现多用户检测 ，并在导频辅助下估计时变信道 。
The multi-user detection is realized by the modified partial parallel interference cancellation (PPIC), and estimates TV channels aided by pilots.
它使用改进的部分并行干扰消除算法实现多用户检测 ，并在导频辅助下估计时变信道 。
The multi-user detection is realized by the modified partial parallel interference cancellation (PPIC), and estimates TV channels aided by pilots.
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