Channel Estimation Scheme with Low-Complexity Discrete Cosine Transform in MIMO-OFDM System

Daisuke TAKEDA  Yasuhiko TANABE  

IEICE TRANSACTIONS on Communications   Vol.E92-B    No.12    pp.3836-3842
Publication Date: 2009/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3836
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
OFDM,  MIMO,  channel estimation,  discrete cosine transform,  

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Channel estimation is a key baseband processing task in wireless systems. Filtering or smoothing algorithms can improve the accuracy of channel estimates and the Discrete Cosine Transform (DCT) can be used for this purpose. By using the DCT, performance will be improved compared to the straight-forward approach of per subcarrier estimation (PSE). However, the complexity of the DCT is not negligible. This paper proposes a low-complexity channel estimation scheme using the DCT. Simulation results show that the performance is improved by more than 1dB compared with PSE in MIMO-OFDM system.