Channel estimation using orthogonal transformation in spatially-correlated multi-antenna OFDM systems

Authors:
Soo-Kwan Kim;Yong-Hwan Lee
Affiliations:
School of Electrical Engineering and INMC, Seoul National University, Seoul, Korea;School of Electrical Engineering and INMC, Seoul National University, Seoul, Korea
Venue:
MWS'09 Proceedings of the 2009 IEEE conference on Mobile WiMAX
Year:
2009

Citing 9
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Abstract

In this paper, we consider channel estimation for the reception of OFDM signal in spatially correlated multi-antenna environments. To improve the aeeuracy of channel estimation, we exploit the characteristies in three dimensions; time, freqneney and spatial domain. The ehannel information is first estimated from pilot signal by means of a eonventionalleast squared method in the frequeney domain. Then the estimated signal is transformed into the time domain by means of invene diserete Fourier transform (DFT) and further transformed into the spatial domain by exploiting the spatial eovarianee matrix of the manneL To reduce the effect of channel noise on the estimation performance, we only utilize signal components having enough power strength for the channel estimation to minimize the mean squared error. Finally, the analytic results are verified by computer simulation. Numerical results show that the proposed channel estimation scheme is quite effective in spatially correlated environments.