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Variable Rate QAM for Mobile Radio

Variable Rate QAM for Mobile Radio
Variable Rate QAM for Mobile Radio
Quadrature amplitude modulation (QAM) schemes which vary the number of modulation levels in accordance with the mobile radio fading channel variations are investigated. Important parameters considered are the fading rate and the block size used. We describe how the adaptive QAM modems can he employed and consider their use in a DECT-like TDD packet structure. System performance in the presence of cochannel interference is also considered. Simulations show that the variable rate system has about 5 dB improvement In channel SNR over a fixed 16-level QAM system for BER's between 10-2 and 10-5 and channel SNR's between 25 and 40 dB.
2223-2230
Webb, WT
37b26109-ae46-4bbb-b0bb-d7b89a62b9e9
Steele, R
7035a3e5-8a4c-434b-a105-46fe2d63d5c3
Webb, WT
37b26109-ae46-4bbb-b0bb-d7b89a62b9e9
Steele, R
7035a3e5-8a4c-434b-a105-46fe2d63d5c3

Webb, WT and Steele, R (1995) Variable Rate QAM for Mobile Radio. IEEE Transactions on Communications, 43 (7), 2223-2230.

Record type: Article

Abstract

Quadrature amplitude modulation (QAM) schemes which vary the number of modulation levels in accordance with the mobile radio fading channel variations are investigated. Important parameters considered are the fading rate and the block size used. We describe how the adaptive QAM modems can he employed and consider their use in a DECT-like TDD packet structure. System performance in the presence of cochannel interference is also considered. Simulations show that the variable rate system has about 5 dB improvement In channel SNR over a fixed 16-level QAM system for BER's between 10-2 and 10-5 and channel SNR's between 25 and 40 dB.

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Published date: July 1995
Organisations: Electronics & Computer Science
Learn more about Electronics & Computer Science research

Identifiers

Local EPrints ID: 253814
URI: http://eprints.soton.ac.uk/id/eprint/253814
PURE UUID: 0f07757b-ee48-4501-9660-5e6a9626211e

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Date deposited: 20 Apr 2001
Last modified: 14 Mar 2024 05:29

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Contributors

Author: WT Webb
Author: R Steele

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