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Reducing the out-of-band radiation of OFDM using an extended guard interval

Jayalath, Dhammika & Tellambura, Chintha (2001) Reducing the out-of-band radiation of OFDM using an extended guard interval. In IEEE VTS 54th Vehicular Technology Conference, 2001 (VTC 2001 Fall)., 7-11 Oct. 2001, Atlantic City, NJ , USA.

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Abstract

We investigate the spectrum, out-of-band radiation (OBR) and the use of extended guard interval (EGI) to reduce the out-of-band radiation of an OFDM signal when passing through different nonlinear devices. Spectra of the OFDM signal with different EGI lengths after passing through nonlinear devices are obtained through computer simulations. Mathematical expressions for the power spectral density of a conventional OFDM signal and an OFDM signal with different EGI lengths are also presented. Theoretical and simulated results are compared. Although the EGI reduces the OBR, this reduction is not significant in some cases. The effect of EGI on the OBR of an OFDM signal differs for different nonlinear devices. The EGI is also not capable of reducing the OBR caused by excessive clipping of the OFDM signal. Finally, it is also found that the length of the EGI does not have a considerable effect on the amount of OBR reduced when passing through a nonlinear device

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ID Code: 13786
Item Type: Conference Paper
Keywords: OFDM, Guard Interval, Out, of, band radiation
DOI: 10.1109/VTC.2001.956888
ISBN: 0780370058
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > COMMUNICATIONS TECHNOLOGIES (100500) > Communications Technologies not elsewhere classified (100599)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2001 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 16 Jun 2008
Last Modified: 11 Aug 2011 03:48

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