一种低复杂度的MIMO-OFDM信道估计新方法

许国平; 张欣; 杨大成

doi:10.3724/SP.J.1146.2006.01478

一种低复杂度的MIMO-OFDM信道估计新方法

doi: 10.3724/SP.J.1146.2006.01478

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出版历程
- 收稿日期: 2006-09-26
- 修回日期: 2007-03-12
- 刊出日期: 2008-04-19

New MIMO-OFDM Channel Estimation Algorithm with Low Complexity

摘要

摘要: 该文基于m序列设计了一种适合多天线收发-正交频分复用(MIMO-OFDM)系统的时域信道估计新方法。在时域OFDM符号之间插入附加循环前缀(CP)的m序列作为训练序列，在接收端将去掉循环前缀的接收序列与指定的循环移位m序列作相关运算，然后利用m序列的二值自相关特性获得信道的冲激响应估计，从而得到信道的频率响应估计。理论分析和仿真结果都表明：在频率选择性信道中，新方法在系统开销小、计算复杂度低的情况下可以取得比传统算法更好的性能。
- 多天线收发-正交频分复用（MIMO-OFDM）; 信道估计; m序列
Abstract: Based on the m-sequence，a time-domain channel estimation algorithm for Multi-Input Multi-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) is designed. The m-sequence with Cyclic Prefix (CP) is inserted between OFDM symbols in time domain as training sequence. The cross-correlation is calculated between the received sequence with CP removed and the appointed circular shifted m-sequence, which takes reliability of the estimation of channel impulse response on account of the two-valued auto-correlation property of the m-sequence, thereby the channel frequency response can be advisably decided. The results of both theoretical analysis and simulation show that the proposed algorithm possesses an impressive performance with less system overhead and lower computation burden than conventional algorithms.

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Sampath H, Talwar S, and Tellado J, et al.. A fourthgeneration MIMO-OFDM broadband wirelesss system:design, performance, and field trial results [J].IEEECommun. Magazine.2002, 40(9):143-149[2]Helmut B, Robert W, and Heath J R, et al.. Blind channelidentification and equalization in OFDM-based multiantennasystems [J].IEEE Trans. on Signal Processing.2002, 50(1):96-109[3]Li Y. Simplified channel estimation for OFDM systems withmultiple transmit antennas. IEEE J. Select. Areas Commun.,2002, 1: 67-75.[4]Suh Changho, Hwang Chan-Soo, and Choi Hokyu.Comparative study of time-domain and frequency-domainchannel estimation in MIMO-OFDM systems. 14th IEEEProceedings on Personal, Indoor and Mobile RadioCommunications, Beijing, 2003, 2: 1095-1099.[5]周炯槃, 庞沁华, 续大我等. 通信原理. 北京: 北京邮电大学出版社, 2002: 172.177.Zhou Jiong-pan, Pang Qin-hua, and Xu Da-wo, et al..Communication Principles. Beijing: Beijing University ofPosts and Telecommunications Press, 2002: 172-177.[6]3GPP Technical Report 25.943, V 6.00 - 3rd GenerationPartnership Project, Technical Specification Group RadioAccess Network, Deployment Aspects. 2004.[7]Branka Vucetic and Yuan Jinhong. Space-time Coding.Beijing: China Machine Press, 2004: 170-173.[8]Barhumi I, Leus G, and Moonen M. Optimal training designfor MIMO OFDM systems in mobile wireless channels[J].IEEETrans. on Signal Processing.2003, 51(6):1615-1624

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