Title :
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
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;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-1311-9
DOI :
10.1109/WICOM.2007.118
