NDLI: A variable rate channel quality feedback scheme for 3G wireless packet data systems

Content Provider	IEEE Xplore Digital Library
Author	Das, A. Khan, F. Sampath, A. Hsuan-Jung Su
Copyright Year	2003
Description	Author affiliation: Lucent Technol. Bell Labs, Holmdel, NJ, USA (Das, A.; Khan, F.; Sampath, A.; Hsuan-Jung Su)
Abstract	An expanded effort is underway to support the evolution of the UMTS and cdma2000-1x standards to meet the rapidly developing needs associated with wireless Internet applications. A number of performance enhancing technologies are proposed to ensure high peak and average packet data rates while supporting circuit-switched voice and packet data on the same spectrum. These techniques include adaptive modulation and coding (AMC), hybrid ARQ (H-ARQ) and fat-pipe scheduling. In order to enable these techniques downlink channel quality feedback (CQF) through explicit uplink signaling is necessary. Frequent CQF results in good estimates of downlink channel quality at the base station, which, in turn, improves downlink system performance. However, this comes at the expense of larger uplink signaling overhead, thereby impacting the overall uplink capacity. Infrequent CQF, on the other hand, reduces this signaling overhead in the uplink at the expense of larger errors in the channel quality estimates available at the base station, thereby leading to system performance degradation. In this paper, we present a variable rate CQF scheme that significantly reduces uplink signaling overhead without affecting downlink system performance. In addition to simulation results demonstrating the performance of the proposed scheme, we also compare the reduction in uplink signaling overhead of the said scheme with other known methods.
Starting Page	982
Ending Page	986
File Size	345358
Page Count	5
File Format	PDF
ISBN	0780378024
DOI	10.1109/ICC.2003.1204494
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Feedback Data systems Downlink System performance Base stations 3G mobile communication Standards development Internet Circuits Modulation coding
Content Type	Text
Resource Type	Article

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