An Improved Channel Estimation Method in OFDM System

DOI

10.2991/isccca.2013.57How to use a DOI?

Keywords

OFDM, channel estimation, Basis Expansion Model (BEM), doubly selective, inverse reconstruction method

Abstract

In this paper, we will focus on channel estimation (CE) in orthogonal frequency-division multiplexing (OFDM) systems. The time-varying (TV) channels are 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. The performs is good when 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 methods to find out the best ones in certain conditions.

Copyright

© 2013, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Shunxian Li
PY  - 2013/02
DA  - 2013/02
TI  - An Improved Channel Estimation Method in OFDM System
BT  - Proceedings of the 2nd International Symposium on Computer, Communication, Control and Automation (ISCCCA 2013)
PB  - Atlantis Press
SP  - 230
EP  - 234
SN  - 1951-6851
UR  - https://doi.org/10.2991/isccca.2013.57
DO  - 10.2991/isccca.2013.57
ID  - Li2013/02
ER  -