Adaptive modulation techniques for duplex OFDM transmission

The design tradeoffs of turbo-coded burst-by-burst adaptive orthogonal frequency division multiplex (OFDM) wideband 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...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology Vol. 49; no. 5; pp. 1893 - 1906
Main Authors: Keller, T., Hanzo, L.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.09.2000
Institute of Electrical and Electronics Engineers
Subjects:
Applied sciences
Channel coding
Channels
Coding
Costs
Detection algorithms
Equipments and installations
Exact sciences and technology
Frequency division
Frequency division multiplexing
Mobile radiocommunication systems
Modems
Modulation
Multiplexing
OFDM modulation
Orthogonal Frequency Division Multiplexing
Radiocommunications
Regulation
Spectra
Subcarriers
Telecommunications
Telecommunications and information theory
Throughput
Transceivers
Turbo codes
Wideband
Performance evaluation
Channel capacity
Transmission channel
Theoretical study
Equalization
Frequency division multiplexing
Algorithm
Adaptive method
Transceiver
High order mode
Wide band
Coding
Modem
ISSN:0018-9545
Online Access:Get full text
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Summary:The design tradeoffs of turbo-coded burst-by-burst adaptive orthogonal frequency division multiplex (OFDM) wideband 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 quantified. 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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ISSN:0018-9545
DOI:10.1109/25.892592