文档介绍：基于插值的MIMO-OFDM无线信道估计方法的研究
摘要
MIMO-OFDM 技术作为 4G 的核心技术,可以大幅度地提高无线通信系统的信道容量与传输速率,并可以有效地抵抗多径衰落,抑制干扰和噪声,适应多媒体应用业务的需求。信道估计是 MIMO-OFDM 系统的一个重要环节,本论文围绕MIMO-OFDM 通信系统中基于插值的无线信道估计问题展开研究。
本文分析讨论了无线信道的传播环境和衰落特性,介绍了无线信道中的 Doppler 效应和多径效应;讨论了无线信道的几种模型;最后还介绍了 MIMO 无线信道模型理论,包括它的相关模型以及对 MIMO 相关信道的仿真。
最后又围绕MIMO-OFDM系统,首先对基于导频符号的信道估计方法进行了简要的总体描述,论述其信道估计的基本过程和原理;然后对信道估计器的设计进行了全面的分析,包括导频形式的选择准则、导频信号的设计和内插滤波方法的设计。然后介绍了MIMO-OFDM系统的一种梳状导频信道估计设计方案,并对线性内插算法进行了计算机仿真,验证了算法有效性。
关键词:多输入多输出;正交频分复用;信道估计;线性内插
RESEARCH ON WIRELESS CHANNEL ESTIMATION METHODS INTERPOLATION-BASED IN MIMO-OFDM SYSTEMS
ABSTRACT
MIMO-OFDM is regarded as one of the most important technologies of the 4th generation mobile munication systems, which can not only effectively enhances the transmission rate and the capacity of the wireless munication system, but bats multi-path fading and interference. The technique is also widely regarded as a most promising and efficient solution for the wideband multimedia operation, because of its high ability of anti-fading, high channel capacity and high bit rate. Channel estimation is one of the most important aspects in the mobile munication systems.
This paper discusses the propagation environment and fading characteristics of wireless channel, describes the Doppler effect and multi-path effects in wireless channel , expresses several wireless channel model, and introduces the theory of MIMO wireless channel model, including its related models and the simulation of MIMO correlated channels .
And finally it focuses on MIMO-OFDM system and describes briefly the channel estimation methods based on pilot symbols, discusses the basic processes and principles of the channel estimation at first; and then analyzes the design of the channel estimator, including the selection criteria of Pilot forms, the design of the pilot signal and the methods of interpolation filter. Then this paper also introduces b pilot channel estimation in MIMO-OFDM systems and finally verifies the validity of