Proceedings ArticleDOI
Parameter optimization, interleaving and multiple access in OFDM with cyclic delay diversity
Gerhard Bauch,J.S. Malik +1 more
- Vol. 1, pp 505-509
TLDR
This work discusses the problem of choosing the cyclic delays and proposes 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.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 us 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 on 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.read more
Citations
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Journal ArticleDOI
Cyclic delay diversity with bit-interleaved coded modulation in orthogonal frequency division multiple access
Gerhard Bauch,J.S. Malik +1 more
TL;DR: This work addresses the problem of choosing the cyclic delays and proposes a new robust design rule which enables to pick up the full spatial and frequency diversity which is inherent in a frequency-selective MIMO channel.
Patent
Methods and systems for combined cyclic delay diversity and precoding of radio signals
George Jöngren,Bo Göransson +1 more
TL;DR: In this article, symbol vectors can be multiplied with a first column subset of unitary matrix, a second diagonal matrix which changes a phase of the virtual transmit antennas, and a third precoding matrix which distributes the transmission across the transmit antennas.
Patent
Method and system for compromise greenfield preambles for 802.11n
TL;DR: In this paper, the authors proposed a greenfield access scheme for IEEE 802.11n WLAN systems in comparison to an alternative approach that may not provide green-field access.
Journal ArticleDOI
Performance comparison of space-time block coded and cyclic delay diversity MC-CDMA systems
TL;DR: It is shown that for an MC-CDMA system, CDD benefits from spreading and channel coding that makes it very competitive with STBCs, particularly since it is applicable to any number of transmit antennas with no loss in rate.
Proceedings ArticleDOI
Orthogonal frequency division multiple access with cyclic delay diversity
G. Bauch,J.S. Malik +1 more
TL;DR: This work discusses the problem of choosing the cyclic delays and proposes a solution which enables to exploit the full spatial diversity in flat fading and frequency-selective channels with unknown delay spread and addresses multi user aspects.
References
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TL;DR: A generalization of orthogonal designs is shown to provide space-time block codes for both real and complex constellations for any number of transmit antennas and it is shown that many of the codes presented here are optimal in this sense.
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Two signaling schemes for improving the error performance of frequency division duplex (FDD) transmission systems using transmitter antenna diversity
TL;DR: Two signaling schemes that exploit the availability of multiple (N) antennas at the transmitter to provide diversity benefit to the receiver are proposed and can suppress co-channel interference.
Journal ArticleDOI
The diversity gain of transmit diversity in wireless systems with Rayleigh fading
TL;DR: The results show that transmit diversity with M transmit antennas provides a diversity gain within 0.1 dB of that with M receive antennas for any number of antennas, and that the same diversity benefit can be obtained at the remotes and base stations using multiple base-station antennas only.
Proceedings ArticleDOI
Standard conformable antenna diversity techniques for OFDM and its application to the DVB-T system
Armin Dammann,Stefan Kaiser +1 more
TL;DR: Different antenna diversity concepts, which can be easily applied to orthogonal frequency division multiplexing (OFDM) systems, are investigated and applied to the DVB-T system for error performance investigations.
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