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
October 2001
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), Atlantic City, United States.
07 - 10 Oct 2001.
.
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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bjc-lh-vtcfall-2001.pdf
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Published date: October 2001
Additional Information:
Event Dates: 7-10 October 2001 Organisation: IEEE Address: Atlantic City, USA
Venue - Dates:
VTC'2001 (Fall), Atlantic City, 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
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Date deposited: 18 Dec 2003
Last modified: 18 Mar 2024 02:33
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Contributors
Author:
B.J. Choi
Author:
L. Hanzo
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