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http://dx.doi.org/10.17662/ksdim.2011.7.3.107

A Novel Channel Estimation using 2-Dimensional Linear Iinterpolation for OFDM MIMO systems  

Oh, Tae Youl (한양대학교 전자통신공학과)
Ahn, Sung Soo (명지전문대학교 정보통신과)
Choi, Seung Won (한양대학교 융합전자공학부)
Publication Information
Journal of Korea Society of Digital Industry and Information Management / v.7, no.3, 2011 , pp. 107-113 More about this Journal
Abstract
An OFDMA(Orthogonal Frequency Division Multiple Access) includes a MIMO(Multi-Input Multi-Output) scheme for improving spectral efficiency and data throughput. Recognizing that the performance of MIMO system is heavily dependent upon the accuracy of channel estimation, we propose a novel channel estimation for the MIMO scheme based on OFDMA. Conventional interpolation-based channel estimation suffers from poor estimation error at specific subcarriers. Proposed scheme makes use of a planar interpolation instead of linear interpolation for those subcarriers of bad accuracy. Simulation results show that the proposed scheme improves the performance of MIMO system by improving the accuracy in channel estimation especially for the adverse subcarrier positions. It is observed that the proposed scheme outperforms the conventional method by about 2dB in terms of both mean squared error and overall bit error rate with a reasonable computational complexity.
Keywords
OFDM; MIMO; Channel Estimation; Linear Interpolation;
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