Scheduling for the downlink in a CDMA network with imperfect channel estimation

TitleScheduling for the downlink in a CDMA network with imperfect channel estimation
Publication TypeConference Paper
Year of Publication2004
AuthorsKwan, R., and C. Leung
Conference NameGlobal Telecommunications Conference Workshops, 2004. GlobeCom Workshops 2004. IEEE
Pagination469 - 476
Date Publishednov.
Keywords3G mobile communication, adaptive codes, adaptive modulation, adaptive modulation and coding, broadband networks, CDMA network, channel estimation, code division multiple access, multicode transmission, optimal effective bit rate, radio links, scheduling, SIR estimation error, telecommunication traffic, traffic load aware scheduling
Abstract

In this paper, the problem of scheduling for a single user on the downlink of a WCDMA network is addressed. Expressions are derived for the optimal effective bit rates when adaptive modulation and coding (AMC) and multicode transmission are employed. Traffic load aware scheduling is also studied. Since the selection of the modulation and coding scheme (MCS) and the number of multicodes requires an estimation of the downlink SIR, it is important to assess the performance degradation due to estimation errors. It is shown that the effective bit rate is quite sensitive to SIR estimation errors. The sensitivity can be reduced by using a conservative estimate of the SIR.

URLhttp://dx.doi.org/10.1109/GLOCOMW.2004.1417624
DOI10.1109/GLOCOMW.2004.1417624

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