Adaptive multi-carrier techniques for cellular and local area networks
Adaptive multi-carrier techniques for cellular and local area networks
The performance of Orthogonal Frequency Division Multiplexed (OFDM) transmission in Additive White Gaussian Noise (AWGN) as well as in time-dispersive and non-time-dispersive Rayleigh fading channels is investigated. The channel models include an indoor Wireless Asynchronous Transfer Mode (QATM) system, a microcellular Wireless Local Area Network (WLAN) as well as an outdoor Universal Mobile Telecommunications System (UMTS) scenario. Differential detection between adjacent subcarriers as well as Pilot Symbol Assisted Modulation (PSAM) are studied for signalling over the time-dispersive channels. The effects of amplifier clipping, Analog-to-Digital Converter (ADC) resolution and saturation at the receiver, as well as those of rapidly time-varying channels and oscillator phase noise on the OFDM system's performance are studied.
The effects of time- and frequency synchronisation errors on the performance of an OFDM system are demonstrated and time- as well as frequency synchronisation algorithms are studied. A joint time- frequency synchronisation algorithm based on a time-domain reference symbol is proposed and it is shown to yield reliable synchronisation over time-dispersive Rayleigh fading channels.
Based on the time-dispersive channel experiments, a sub-band adaptive modulation scheme for OFDM transmission in a Time Division Duplex (TDD) framework requiring low signalling overhead is suggested. Blind modulation scheme detection is explored as a means of further reducing the signalling overhead for adaptive OFDM modems. Pre-equalisation at the transmitter is investigated, and a joint adaptive modulation and pre-equalisation scheme is presented.
Adaptive coding based on Redundant Residual Number System (RRNS) codes and turbo-BCH codes is suggested and evaluated. Adaptive coding in conjunction with adaptive modulation schemes are studied, and simulation results in Rayleigh fading multi-path channels are presented.
University of Southampton
Keller, Thomas
6c0da011-9f4b-49ba-8aa0-2feef74ade4b
1999
Keller, Thomas
6c0da011-9f4b-49ba-8aa0-2feef74ade4b
Keller, Thomas
(1999)
Adaptive multi-carrier techniques for cellular and local area networks.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The performance of Orthogonal Frequency Division Multiplexed (OFDM) transmission in Additive White Gaussian Noise (AWGN) as well as in time-dispersive and non-time-dispersive Rayleigh fading channels is investigated. The channel models include an indoor Wireless Asynchronous Transfer Mode (QATM) system, a microcellular Wireless Local Area Network (WLAN) as well as an outdoor Universal Mobile Telecommunications System (UMTS) scenario. Differential detection between adjacent subcarriers as well as Pilot Symbol Assisted Modulation (PSAM) are studied for signalling over the time-dispersive channels. The effects of amplifier clipping, Analog-to-Digital Converter (ADC) resolution and saturation at the receiver, as well as those of rapidly time-varying channels and oscillator phase noise on the OFDM system's performance are studied.
The effects of time- and frequency synchronisation errors on the performance of an OFDM system are demonstrated and time- as well as frequency synchronisation algorithms are studied. A joint time- frequency synchronisation algorithm based on a time-domain reference symbol is proposed and it is shown to yield reliable synchronisation over time-dispersive Rayleigh fading channels.
Based on the time-dispersive channel experiments, a sub-band adaptive modulation scheme for OFDM transmission in a Time Division Duplex (TDD) framework requiring low signalling overhead is suggested. Blind modulation scheme detection is explored as a means of further reducing the signalling overhead for adaptive OFDM modems. Pre-equalisation at the transmitter is investigated, and a joint adaptive modulation and pre-equalisation scheme is presented.
Adaptive coding based on Redundant Residual Number System (RRNS) codes and turbo-BCH codes is suggested and evaluated. Adaptive coding in conjunction with adaptive modulation schemes are studied, and simulation results in Rayleigh fading multi-path channels are presented.
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Published date: 1999
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Local EPrints ID: 464035
URI: http://eprints.soton.ac.uk/id/eprint/464035
PURE UUID: cd493661-de1f-4d95-a414-f25be3836156
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Date deposited: 04 Jul 2022 21:01
Last modified: 04 Jul 2022 21:01
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Author:
Thomas Keller
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