Adaptive Modulation Techniques for Duplex OFDM Transmission
Adaptive Modulation Techniques for Duplex OFDM Transmission
The design tradeoffs of turbo-coded burst-by-burst adaptive orthogonal frequency division multiplex (OFDM) wide-band transceivers are analyzed. We demonstrate that upon aiming for a higher throughput a higher proportion of low-quality OFDM subcarriers has to be used for the transmission of inherently vulnerable high-order modem modes, transmitting several bits per subcarrier. Upon invoking turbo coding and adjusting the modem mode switching regime near-error-free performance can be achieved at the cost of a reduced throughput. Various blind modem mode detection techniques have also been investigated and the most complex channel coding trellis-based detection algorithm was found to be the most powerful. Last, the design tradeoffs of spectral pre-equalization have been explored and qualified. We concluded that AOFDM provides a convenient framework for adjusting the required target integrity and throughput both with and without turbo channel coding.
1893-1906
Keller, T.
41cd2bbf-bf82-4aac-83e9-d585f67f9742
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
September 2000
Keller, T.
41cd2bbf-bf82-4aac-83e9-d585f67f9742
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Keller, T. and Hanzo, L.
(2000)
Adaptive Modulation Techniques for Duplex OFDM Transmission.
IEEE Transactions on Vehicular Technology, 49 (5), .
Abstract
The design tradeoffs of turbo-coded burst-by-burst adaptive orthogonal frequency division multiplex (OFDM) wide-band transceivers are analyzed. We demonstrate that upon aiming for a higher throughput a higher proportion of low-quality OFDM subcarriers has to be used for the transmission of inherently vulnerable high-order modem modes, transmitting several bits per subcarrier. Upon invoking turbo coding and adjusting the modem mode switching regime near-error-free performance can be achieved at the cost of a reduced throughput. Various blind modem mode detection techniques have also been investigated and the most complex channel coding trellis-based detection algorithm was found to be the most powerful. Last, the design tradeoffs of spectral pre-equalization have been explored and qualified. We concluded that AOFDM provides a convenient framework for adjusting the required target integrity and throughput both with and without turbo channel coding.
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49vt05-keller.pdf
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Published date: September 2000
Organisations:
Southampton Wireless Group
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Local EPrints ID: 254458
URI: http://eprints.soton.ac.uk/id/eprint/254458
ISSN: 0018-9545
PURE UUID: f2eef0e5-ee38-4772-b0d9-c4bc2e864bf9
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Date deposited: 21 Jan 2004
Last modified: 18 Mar 2024 02:33
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Author:
T. Keller
Author:
L. Hanzo
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