Channel Estimation in MIMO-OFDM Systems by Tracking the Delay-Subspace

Author

Liu, Peng ; An, Jianping ; Bu, Xiangyuan ; Zhou, Ronghua

Author_Institution

Sch. of Inf. Sci. & Technol., Dept. of Electron. Eng., Beijing Inst. of Technol., Beijing

fYear

2007

fDate

21-25 Sept. 2007

Firstpage

448

Lastpage

451

Abstract

A time domain channel estimation method in MIMO- OFDM systems by tracking the delay-subspace is proposed. The time impulse response is estimated by transmitting known pilot symbols, and the estimation performance is improved by the Givens rotation based delay-subspace tracking and amplitudes tracking based on the LMS filtering. The simulations prove that the time domain channel estimation by tracking the delay- subspace can track faster fading channels, and is more accurate with low complexity.

Keywords

MIMO communication; OFDM modulation; adaptive filters; channel estimation; fading channels; Givens rotation; LMS filtering; MIMO-OFDM systems; amplitudes tracking; delay-subspace tracking; fading channels; impulse response; low rank adaptive filter; orthogonal frequency division multiplexing; time domain channel estimation; Adaptive filters; Amplitude estimation; Channel estimation; Delay effects; Delay estimation; Least squares approximation; Matched filters; OFDM; Receiving antennas; Time factors;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on

Conference_Location

Shanghai

Print_ISBN

978-1-4244-1311-9

Type

conf

DOI

10.1109/WICOM.2007.118

Filename

4339893