Title :
Enhanced Phase-Shifted Pilots Based Channel Estimation for MIMO-OFDM Systems with Virtual Subcarriers
Author :
Li, Dong ; Zhu, Xiaolong ; Yang, Hongwei ; Cai, Liyu
Author_Institution :
R&I Center, Alcatel Shanghai Bell Co., Ltd.
Abstract :
Generalizing a conventional phase-shifted pilot (PSP) sequences and discrete Fourier transform (DFT) based channel estimator to MIMO-OFDM systems with virtual subcarriers, this paper presents two enhanced channel estimators applying Wiener interpolation and smoothing. Simulation results show that the proposed schemes can almost eliminate the mean square error floor of the conventional PSP/DFT-based channel estimator and improve the channel estimation accuracy further in some cases. Additionally, the application of a robust channel correlation matrix estimator avoids the complicated measurement of channel statistical properties and thus makes the proposed schemes more feasible in practical systems
Keywords :
MIMO systems; OFDM modulation; channel estimation; correlation methods; discrete Fourier transforms; interpolation; matrix algebra; mean square error methods; smoothing methods; MIMO-OFDM systems; Wiener interpolation; channel estimation; channel statistical properties; discrete Fourier transform; enhanced phase-shifted pilot sequences; mean square error floor; robust channel correlation matrix estimator; virtual subcarriers; AWGN; Channel estimation; Discrete Fourier transforms; Interpolation; Mean square error methods; OFDM; Phase estimation; Receiving antennas; Robustness; Wireless LAN;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd
Conference_Location :
Melbourne, Vic.
Print_ISBN :
0-7803-9391-0
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2006.1683142
