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Rake Receiver Detection of Adaptive Modulation Aided CDMA over Frequency Selective Channels

Rake Receiver Detection of Adaptive Modulation Aided CDMA over Frequency Selective Channels
Rake Receiver Detection of Adaptive Modulation Aided CDMA over Frequency Selective Channels
A closed form Bit Error Ratio (BER) formula is derived for a fixed-mode Quadrature Amplitude Modulation (QAM) scheme employing Rake receivers and receiver antenna diversity. The analysis is extended to constant power Adaptive QAM (AQAM) expressing the average BER and the average throughput as a closed form function of the modulation mode switching levels. Then, the switching levels are optimised so that the average throughput is maximised, while maintaining a given target BER. This results in a constant-BER, variable-throughput arrangement. The results show that our constant-power AQAMscheme exhibits an SNR gain of about 5dB in comparison to fixed-mode QAM, when operating over a Wireless Asynchronous Transfer Mode (W-ATM) channel employing one antenna. However, the achievable throughput gain of the system over conventional fixed-mode modems is substantially reduced, as the diversity order of the receiver is increased.
1653-1657
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) Rake Receiver Detection of Adaptive Modulation Aided CDMA over Frequency Selective Channels. VTC'2001 (Fall), United States. 07 - 10 Oct 2001. pp. 1653-1657 .

Record type: Conference or Workshop Item (Paper)

Abstract

A closed form Bit Error Ratio (BER) formula is derived for a fixed-mode Quadrature Amplitude Modulation (QAM) scheme employing Rake receivers and receiver antenna diversity. The analysis is extended to constant power Adaptive QAM (AQAM) expressing the average BER and the average throughput as a closed form function of the modulation mode switching levels. Then, the switching levels are optimised so that the average throughput is maximised, while maintaining a given target BER. This results in a constant-BER, variable-throughput arrangement. The results show that our constant-power AQAMscheme exhibits an SNR gain of about 5dB in comparison to fixed-mode QAM, when operating over a Wireless Asynchronous Transfer Mode (W-ATM) channel employing one antenna. However, the achievable throughput gain of the system over conventional fixed-mode modems is substantially reduced, as the diversity order of the receiver is increased.

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More information

Published date: October 2001
Additional Information: Event Dates: 7-10 October 2001 Organisation: IEEE Address: Atlantic City, USA
Venue - Dates: VTC'2001 (Fall), United States, 2001-10-07 - 2001-10-10
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 257128
URI: http://eprints.soton.ac.uk/id/eprint/257128
PURE UUID: 67c302d2-3504-4dff-91ff-1a425f8d5e37
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 18 Dec 2003
Last modified: 20 Jul 2019 01:26

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Contributors

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

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