NDLI: Orthogonal frequency division multiple access with cyclic delay diversity

Content Provider	IEEE Xplore Digital Library
Author	Bauch, G. Malik, J.S.
Copyright Year	2004
Description	Author affiliation: DoCoMo Euro-Labs., Munich, Germany (Bauch, G.; Malik, J.S.)
Abstract	Cyclic delay diversity is a simple transmit diversity technique for coded OFDM systems with multiple transmit antennas. It does neither require an extended guard interval nor modifications of the standard OFDM receiver. We discuss the problem of choosing the cyclic delays and propose a solution which enables to exploit the full spatial diversity in flat fading and frequency-selective channels with unknown delay spread. As a result, the spatial diversity is transformed into frequency diversity between neighbouring subcarriers. This imposes certain restrictions to the channel coding and interleaving scheme. Furthermore, we address multi user aspects and propose an interleaving and multiple access strategy which guarantees that all users obtain the maximum possible diversity advantage using FEC codes with a limited constraint length. A performance comparison shows that space-time block codes outperform cyclic delay diversity on the expense of higher complexity and lower flexibility.
Starting Page	17
Ending Page	24
File Size	516400
Page Count	8
File Format	PDF
ISBN	0780383273
DOI	10.1109/WSA.2004.1407642
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-18
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Delay effects Transmitting antennas Receiving antennas Diversity methods Forward error correction Frequency conversion Interleaved codes Frequency diversity Block codes
Content Type	Text
Resource Type	Article

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