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Techniques for reducing out-of-band radiation in OFDM based transmission systems

Brandes, Sinja and Cosovic, Ivan and Schnell, Michael (2010) Techniques for reducing out-of-band radiation in OFDM based transmission systems. European Transactions on Telecommunications, 21 (2), pp. 142-153. Wiley. DOI: 10.1002/ett.1406

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Abstract

Orthogonal frequency-division multiplexing (OFDM) suffers from high out-of-band radiation that prohibits the efficient use of the available spectrum particularly in OFDM based overlay systems. Recently, three different techniques for sidelobe suppression have been proposed and are recapitulated in this paper. One approach referred to as subcarrier weighting is based on weighting the individual subcarriers such that their sidelobes cancel each other. Alternatively, cancellation carriers are inserted at the edges of the spectrum in order to cancel the sidelobes of the transmit (Tx) signal. Thirdly, with the multiple choice sequences method, the symbol vector is transformed into multiple equivalent Tx sequences and the one with the lowest sidelobe power is transmitted. Sidelobes are reduced significantly at the expense of a slightly ncreased bit error rate or a reduced throughput. In order to further improve performance, in the paper, the combination with Tx windowing and reasonable combinations of the three methods are proposed and investigated. Simulation results show that the suppression achieved with the joint application of two techniques considerably exceeds the suppression achieved with the methods applied separately.

Item URL in elib:https://elib.dlr.de/63717/
Document Type:Article
Title:Techniques for reducing out-of-band radiation in OFDM based transmission systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Brandes, SinjaUNSPECIFIEDUNSPECIFIED
Cosovic, Ivanehemals DLRUNSPECIFIED
Schnell, MichaelUNSPECIFIEDUNSPECIFIED
Date:2010
Journal or Publication Title:European Transactions on Telecommunications
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:21
DOI :10.1002/ett.1406
Page Range:pp. 142-153
Publisher:Wiley
Status:Published
Keywords:OFDM, sidelobe suppression, cancellation carrier
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old)
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Effiziente Flugführung und Flugbetrieb (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Communications Systems
Deposited By: Brandes, Sinja
Deposited On:25 Mar 2010 08:35
Last Modified:08 Mar 2018 18:27

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