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Effect of Doppler frequency on pilot arrangements in wireless OFDM systems

Arshad, K. and Sheikh, A.U.H. (2004) Effect of Doppler frequency on pilot arrangements in wireless OFDM systems. Information and Communication Technologies: From Theory to Applications, 2004. Proceedings. 2004 International conference, 1.

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Abstract

This paper describes in detail the effect of Doppler frequency on different pilot arrangements in wireless OFDM systems, under Rayleigh faded channel conditions. This paper also addresses the issue, of how to arrange the location of pilot tones, and a new pilot insertion scheme is proposed and compared. It is shown, that for lower Doppler frequencies the proposed scheme performs better than other existing pilot schemes. It is shown via simulations that over Rayleigh multipath faded channels it is more efficient to use fewer pilot tones in all symbols, instead of using all tones as pilot tones in some symbols. Another important observation from the simulation results is, that comb-type pilot estimation is less effected by Doppler frequency. The reason is the existence of inter carrier interference (ICI) caused by Doppisler shifts.



Item Type:Article
Date:April 2004
Date Type:Publication
Subjects:Computer
Divisions:College Of Engineering Sciences > Electrical Engineering Dept
Creators:Arshad, K. and Sheikh, A.U.H.
ID Code:14057
Deposited By:KFUPM ePrints Admin
Deposited On:24 Jun 2008 16:20
Last Modified:12 Apr 2011 13:14

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