Variable Rate QAM for Mobile Radio

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


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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.

Item Type: Article
Organisations: Electronics & Computer Science
ePrint ID: 253814
Date :
Date Event
July 1995Published
Date Deposited: 20 Apr 2001
Last Modified: 17 Apr 2017 23:21
Further Information:Google Scholar

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