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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 347-350An Improved Channel Estimation Method in OFDM...

An Improved Channel Estimation Method in OFDM System

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Abstract:

In this paper, we will focus on channel estimation (CE) in orthogonal frequency-division multiplexing (OFDM) systems. The time-varying (TV) channelsare modeled by a basis expansion model (BEM). Due to the time-variation, the channel matrix in the frequency domain is no longer diagonal, but approximately banded.We use a pilot-aided algorithm for estimation of rapidly varying wireless channels in OFDM systems. Theperforms is goodwhen the channels vary on the scale of a single OFDM symbol duration, which occurs in mobile communication scenarios such as WiMAX, WAVE, and DVB-T.We recover Fourier coefficients of the channel taps by the pilot information.We then estimate the BEM coefficients of the channel taps from their respective Fourier coefficients using a recently developed inverse reconstruction method.We compare some BEM models in inverse methodsto find out the best ones in certain conditions.

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Periodical:

Applied Mechanics and Materials (Volumes 347-350)

Pages:

1646-1652

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.347-350.1646

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Online since:

August 2013

Authors:

Shun Xian Li

Keywords:

Basis Expansion Model (BEM), Channel Estimation, Doubly Selective, Inverse Reconstruction Method, Orthogonal Frequency Division Multiplexing (OFDM)

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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