Title :
Scheduling for the downlink in a CDMA network with imperfect channel estimation
Author :
Kwan, Raymond ; Leung, Cyril
Author_Institution :
Dept. of Electr. & Comput. Eng., British Columbia Univ., Canada
fDate :
29 Nov.-3 Dec. 2004
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.
Keywords :
3G mobile communication; adaptive codes; adaptive modulation; broadband networks; channel estimation; code division multiple access; radio links; scheduling; telecommunication traffic; CDMA network; SIR estimation error; adaptive modulation and coding; channel estimation; code division multiple access; multicode transmission; optimal effective bit rate; traffic load aware scheduling; Bit rate; Channel coding; Channel estimation; Downlink; Estimation error; Intelligent networks; Modulation coding; Multiaccess communication; Processor scheduling; Telecommunication traffic;
Conference_Titel :
Global Telecommunications Conference Workshops, 2004. GlobeCom Workshops 2004. IEEE
Print_ISBN :
0-7803-8798-8
DOI :
10.1109/GLOCOMW.2004.1417624
