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Optimum Mode-Switching-Assisted Constant-Power Single- and Multicarrier Adaptive Modulation

Optimum Mode-Switching-Assisted Constant-Power Single- and Multicarrier Adaptive Modulation
Optimum Mode-Switching-Assisted Constant-Power Single- and Multicarrier Adaptive Modulation
A set of optimum mode-switching levels is derived for a generic constant-power adaptive-modulation scheme based on a closed-form expression of the average bit error ratio (BER) and the average bits-per-symbol (BPS) throughput of the adaptive-modulation scheme. This results in a constant BER, variable-throughput arrangement. The corresponding BPS throughput performance and the achievable signal-to-noise ratio (SNR) gain are investigated for the optimum mode-switching assisted constant-power adaptive-modulation schemes employing various diversity schemes, including maximal ratio combining (MRC) receive-antenna diversity, a two-dimensional RAKE receiver, as well as transmit-diversity aided space-time (ST) coding, when communicating over various fading scenarios. The BPS throughput of our constant-power adaptive quadrature amplitude modulation (AQAM) scheme approaches the throughput of variable-power variable-rate AQAM within 1 dB. However, the achievable throughput gain of the adaptive-modulation scheme, in comparison to conventional fixed-mode modems, is substantially reduced as the diversity order of the receiver is increased. Hence, adaptive modulation constitutes a lower complexity alternative to multiple-transmitter and receiver-based systems when considering the range of techniques that can be used for mitigating the effects of the channel-quality fluctuations imposed by wireless channels. Index Terms—Adaptive modulation, adaptive quadrature amplitude modulation (AQAM), fading counter measures, Lagrangian optimization for adaptive modulation, optimum switching levels for adaptive modulation.
0018-9545
536-560
Choi, B.J.
e5e6cf6f-c5a9-4fa1-a038-81782918a1f9
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Choi, B.J.
e5e6cf6f-c5a9-4fa1-a038-81782918a1f9
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1

Choi, B.J. and Hanzo, L. (2003) Optimum Mode-Switching-Assisted Constant-Power Single- and Multicarrier Adaptive Modulation. IEEE Transactions on Vehicular Technology, 52 (3), 536-560.

Record type: Article

Abstract

A set of optimum mode-switching levels is derived for a generic constant-power adaptive-modulation scheme based on a closed-form expression of the average bit error ratio (BER) and the average bits-per-symbol (BPS) throughput of the adaptive-modulation scheme. This results in a constant BER, variable-throughput arrangement. The corresponding BPS throughput performance and the achievable signal-to-noise ratio (SNR) gain are investigated for the optimum mode-switching assisted constant-power adaptive-modulation schemes employing various diversity schemes, including maximal ratio combining (MRC) receive-antenna diversity, a two-dimensional RAKE receiver, as well as transmit-diversity aided space-time (ST) coding, when communicating over various fading scenarios. The BPS throughput of our constant-power adaptive quadrature amplitude modulation (AQAM) scheme approaches the throughput of variable-power variable-rate AQAM within 1 dB. However, the achievable throughput gain of the adaptive-modulation scheme, in comparison to conventional fixed-mode modems, is substantially reduced as the diversity order of the receiver is increased. Hence, adaptive modulation constitutes a lower complexity alternative to multiple-transmitter and receiver-based systems when considering the range of techniques that can be used for mitigating the effects of the channel-quality fluctuations imposed by wireless channels. Index Terms—Adaptive modulation, adaptive quadrature amplitude modulation (AQAM), fading counter measures, Lagrangian optimization for adaptive modulation, optimum switching levels for adaptive modulation.

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More information

Published date: May 2003
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 258405
URI: https://eprints.soton.ac.uk/id/eprint/258405
ISSN: 0018-9545
PURE UUID: 3197e5b9-ba95-428b-bf4c-8a41b2e2acf8
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 01 Dec 2003
Last modified: 06 Jun 2018 13:14

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Contributors

Author: B.J. Choi
Author: L. Hanzo ORCID iD

University divisions

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