单中继协同通信MIMO-OFDM系统的信道估计研究.docVIP

  单中继协同通信 MIMO-OFDM 系统的信道 估计研究 李喆，俎云霄** 5 10 15 20 25 30 35 40 （北京邮电大学电子工程学院） 摘要：在通信过程中，信道估计是设计接收机必须考虑的关键部分，对于 MIMO-OFDM 系 统更是如此。对 MIMO-OFDM 系统而言，信道的个数将会随着天线数目、用户数目的持续 增多而快速增加，因此信道估计问题在 MIMO-OFDM 系统中是较为复杂的。虽然在通信领 域已有大量的关于信道估计问题的研究，但是其中的大多数都只适用于单一的平坦衰落信 道，应用范围很窄，而实际上在不同通信环境中会遇到相应的问题。本文以单中继协同通信 环境为例，首先对信道估计方法对通信系统的意义进行了描述，概述了信道估计方法的基本 原理，分析了几种传统信道估计方法的优缺点，在详细分析基于 LS 准则和 LMMSE 准则的 半盲信道估计方法的基础上，分析了单中继协同通信系统的信道估计结果，并通过对误码率 和信道容量的分析，研究了常规信道估计算法在不同环境下的适应性。 关键词：信息处理技术；MIMO-OFDM 系统；信道估计；协同通信 中图分类号：TN92 Research on Channel Estimation of One-relay Cooperative Communication MIMO-OFDM System LI Zhe, ZU Yunxiao (School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876) Abstract: In a telecommunication system, the channel estimation is a key part of the receiver, especially for a MIMO-OFDM system. In a MIMO-OFDM system, the number of channels will increase with the number of antennas and users, so the channel estimation in MIMO-OFDM system is much complex. While a lot of researches about channel estimation have been done, most of them are only applicable to the single condition of flat fading channel. But actually, corresponding problems will be met in different communication environments. Based on one-relay cooperative communication environment, this essay describes the meaning of channel estimation method in communication system, and summarizes the basic principle of channel estimation method, then analyzes the advantages and disadvantages of several kinds of traditional channel estimation algorithm. After analyzing two different channel estimation methods based on LS and LMMSE, it also analyzes several channel estimation issues in different condition, such as multiple-antenna, one-relay cooperative communication system and fast fading environment. At last, through the analysis of BER and channel capacity, this essay gives a conclusion of the adaptability of different algorithms. Key words: information processing technology; MIMO-