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Summary: Dynamic Bit Rate Assignment in Wireless CDMA Data Transmissions
Andrea Abrardo, Giuliano Benelli, Giovanni Giambene, David Sennati
Dipartimento di Ingegneria dell'Informazione - Università degli Studi di Siena
Via Roma, 56 - 53100 Siena, ITALY, tel: +39 0577 234624, fax: +39 0577 233602
$EVWUDFW - This paper compares different schemes
that can be used to improve the performance of
CDMA in wireless data systems. In particular, we
consider a closed-loop power control scheme and
an adaptive coding scheme. The comparison
between these different techniques is performed in
terms of mean transmission time and energy
efficiency. Our aim is to show that an adaptive
coding scheme can allow a good performance with
respect to typical power control techniques.
, ,QWURGXFWLRQ
The air interface of third generation mobile
communication systems will be based on 'LUHFW
6HTXHQFH-&RGH 'LYLVLRQ 0XOWLSOH $FFHVV (DS-
CDMA). A particular advantage of DS-CDMA is
its capability to support different data rates [1]. We
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