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http://dx.doi.org/10.7840/KICS.2011.36C.5.317

A Low-Complexity 2-D MMSE Channel Estimation for OFDM Systems  

Kim, Jung-In (성균관대학교 정보통신공학부 통신시스템 연구실)
Jang, Jun-Hee (성균관대학교 정보통신공학부 통신시스템 연구실)
Choi, Hyung-Jin (성균관대학교 정보통신공학부 통신시스템 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.36, no.5C, 2011 , pp. 317-325 More about this Journal
Abstract
For OFDM (Orthogonal Frequency Division Multiplexing) systems, 2-D MMSE (2-Dimensional Minimum Mean Square Error) channel estimation provides optimal performance in frequency/time selective fading channel environment. However, the 2-D MMSE channel estimation has high computational complexity due to the large matrix size, because the 2-D MMSE channel estimation considers time as well as frequency axis for channel estimation. To reduce the computational complexity, we propose a modified 2-D MMSE channel estimator which is based on 1-D MMSE channel estimation with weighted sum. Furthermore, we consider RMS delay spread and Doppler frequency estimation for 2-D MMSE channel estimation. We show that the proposed method can significantly reduce computational complexity as well as that it can perform close to 2-D MMSE channel estimation.
Keywords
OFDM; 2-D MMSE channel estimation; RMS delay spread estimation; Doppler frequency estimation; low-complexity;
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