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On the Influence of Cyclic Delay Diversity and Doppler Diversity on the Channel Characteristics in OFDM Systems

Dammann, Armin (2007) On the Influence of Cyclic Delay Diversity and Doppler Diversity on the Channel Characteristics in OFDM Systems. In: Proceedings IEEE International Conference on Communications (ICC 2007). IEEE International Conference on Communications, [2007-06-24 - 2007-06-28], Glasgow, Scotland.

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Abstract

In this paper, we analyze the influence of the transmit antenna diversity techniques cyclic delay diversity (CDD) and discontinuous Doppler diversity (DDoD) on the channel observation at the receiver side for wireless communications systems based on orthogonal frequency division multiplexing (OFDM). These antenna diversity techniques influence the channel fading characteristic, and thus, are described as a modified channel. We analyze this modified channel in terms of its channel transfer function and fading correlation in time and frequency direction. We will see, that the fading correlation factorizes into an antenna related part and a propagation channel part. This is, the transmitter does not require any information about the channel itself in order to design roots in the correlation function. This analysis yields a guidance for the choice of the antenna configuration parameters, which is the goal of this paper. The proper choice of these parameters (cyclic delays, Doppler shifts) allows for reducing respectively removing fading correlation in time and/or frequency direction, and therefore, optimizing diversity

Document Type:Conference or Workshop Item (Speech, Paper)
Title:On the Influence of Cyclic Delay Diversity and Doppler Diversity on the Channel Characteristics in OFDM Systems
Authors:
AuthorsInstitution or Email of Authors
Dammann, ArminUNSPECIFIED
Date:28 February 2007
Journal or Publication Title:Proceedings IEEE International Conference on Communications (ICC 2007)
Refereed publication:Yes
In ISI Web of Science:No
Editors:
EditorsEmail
IEEE, UNSPECIFIED
Status:Published
Keywords:Cyclic Delay Diversity, CDD, Discontinuous Doppler Diversity, OFDM, Correlation
Event Title:IEEE International Conference on Communications
Event Location:Glasgow, Scotland
Event Type:international Conference
Event Dates:[2007-06-24 - 2007-06-28]
Organizer:IEEE
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W KN - Kommunikation/Navigation
DLR - Research area:Space
DLR - Program:W KN - Kommunikation/Navigation
DLR - Research theme (Project):W - Vorhaben GNSS2/Neue Dienste und Produkte (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation
Institute of Communication and Navigation > Communications Systems
Deposited By: Dr.-Ing. Armin Dammann
Deposited On:09 Jul 2007
Last Modified:15 Jan 2010 00:26

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