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A Simple Space-Frequency Coding Scheme With Cyclic Delay Diversity for OFDM

Overview Cyclic Delay Diversity (CDD) is a simple approach to increase the frequency selectivity of the channel in an Orthogonal Frequency Division Multiplexing (OFDM) based transmission scheme. The reason for this is that CDD inserts virtual echos. Due to these virtual multipath components carriers experience different channels if the antenna specific cyclic delays are chosen properly. This paper investigates a simple multiple antenna transmission scheme that exploits the frequency selectivity of the channel even without FEC coding. On each antenna a shifted version of the signal is sent which enables the receiver to apply optimum demodulation. The paper analyzes the choice of the cyclic delay and presents a comparison with the well-known Alamouti scheme.

Further White Paper Details
Publisher	University of Ulm	File Format	PDF
Date Published	April 2003
Format	White Papers
Topics	Wireless LAN, Mobile - Wireless Communications

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