Scheduled System Maintenance:
Some services will be unavailable Sunday, March 29th through Monday, March 30th. We apologize for the inconvenience.
By Topic

An iterative channel estimator for fast-varying channels using successive OFDM symbols

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

The purchase and pricing options are temporarily unavailable. Please try again later.
2 Author(s)
El Hajj Shehadeh, Y. ; Sequans Commun., Paris, France ; Sezginer, S.

This paper deals with pilot-based channel estimation for fast varying channels in Orthogonal Frequency Division Multiplexing (OFDM) systems. Due to the variation of the channel during one OFDM symbol, one-tap channel estimation and the corresponding equalization is no longer the optimum solution and such a variation results in inter-carrier interference (ICI). One of the possible approaches to predict this interfering effect is to use basis expansion model (BEM) with which the variation of the channel can be approximated successfully. However, as the pure BEM does not solve completely the problem, we investigate the estimation problem using decision feedback to enhance the performance. In particular, we propose a simple algorithm based on using two successive OFDM symbols to filter channel coefficients and improve not only the convergence of pure decision feedback based estimation but also the system performance. Simulation results based on Jake's channel model with a high Doppler spread and a practical high data rate system sustain our claims.

Published in:

Personal, Indoor and Mobile Radio Communications, 2009 IEEE 20th International Symposium on

Date of Conference:

13-16 Sept. 2009