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Optimum Mode-Switching Assisted Adaptive Modulation

Optimum Mode-Switching Assisted Adaptive Modulation
Optimum Mode-Switching Assisted Adaptive Modulation
Adaptive modulation techniques combat fading by employing a suitable modulation mode depending on the instantaneous channel conditions for improving the Bit Error Rate (BER) performance or the average through-put. Based on a generic model of constant-power adaptive modulation, exact closed form expressions of the average BER and the average throughput are derived, when employing square Quadrature Amplitude Modulation (QAM) or Phase Shift Keying (PSK) as the constituent modulation modes, operating over a Nakagami fading channel. The optimum modulation-mode switching levels, achieving the highest possible throughput under the constraint of the average BER, are obtained using the Lagrangian optimisation method. Adaptive modulation employing the optimum switching levels shows a superior performance, while maintaining a constant average BER.
3316-3320
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. (2001) Optimum Mode-Switching Assisted Adaptive Modulation. Globecom 2001, United States. 25 - 29 Nov 2001. pp. 3316-3320 .

Record type: Conference or Workshop Item (Paper)

Abstract

Adaptive modulation techniques combat fading by employing a suitable modulation mode depending on the instantaneous channel conditions for improving the Bit Error Rate (BER) performance or the average through-put. Based on a generic model of constant-power adaptive modulation, exact closed form expressions of the average BER and the average throughput are derived, when employing square Quadrature Amplitude Modulation (QAM) or Phase Shift Keying (PSK) as the constituent modulation modes, operating over a Nakagami fading channel. The optimum modulation-mode switching levels, achieving the highest possible throughput under the constraint of the average BER, are obtained using the Lagrangian optimisation method. Adaptive modulation employing the optimum switching levels shows a superior performance, while maintaining a constant average BER.

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More information

Published date: November 2001
Additional Information: Event Dates: 25-29 November 2001 Organisation: Globecom Address: San Antonio, Texas, USA
Venue - Dates: Globecom 2001, United States, 2001-11-25 - 2001-11-29
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 256180
URI: https://eprints.soton.ac.uk/id/eprint/256180
PURE UUID: a5c95854-d196-41fb-98f0-4ed8ac8e8bfa
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 18 Dec 2003
Last modified: 06 Jun 2018 13:14

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