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http://dx.doi.org/10.5515/KJKIEES.2007.18.12.1408

Pilot Symbol Assisted Channel Estimation and Equalization for OFDM Systems in Doubly Selective Channels  

Lim, Dong-Min (Department of Electronic Engineering, Gyeongsang National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.12, 2007 , pp. 1408-1418 More about this Journal
Abstract
In this paper, we analyze the performance of pilot symbol assisted channel estimation and equalization schemes for OFDM systems over frequency-selective time-varying channels and propose methods to improve the system performance. In the least square(LS) and linear minimum mean square error(MMSE) channel estimation, time domain windowing is introduced for banding the frequency domain channel matrix. The linear MMSE and decision feedback equalization schemes are employed with the pilot symbols for channel estimation taken into account in the equalization process. To reduce computational complexity, the band LU matrix factorization algorithm is introduced in solving the linear systems involved in the equalization, and the performances are compared with the known previous results by computer simulations. When time domain windowing is employed in the decision feedback equalization, the matrix related with the decision feedback process is shown to be unhanded and the resultant performance degradation is analyzed.
Keywords
Channel Estimation; Equalization; OFDM; Doubly Selective Channel; Pilot Symbol;
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