NDLI: Outage-based ergodic link adaptation for fading channels with delayed CSIT

Content Provider	IEEE Xplore Digital Library
Author	Jung Hyun Bae Jungwon Lee Inyup Kang
Copyright Year	2013
Description	Author affiliation: Samsung US R&D Center, Mobile Solutions Lab., San Diego, CA, USA (Jung Hyun Bae; Jungwon Lee; Inyup Kang)
Abstract	To deal with a time-varying nature of the wireless channel, the most modern wireless systems use link adaptation in which the transmission rate is adjusted according to the current fading status to ensure reliable communication. For example, the current long-term evolution (LTE) standards require the user equipment (UE) to report channel quality indicator (CQI) to the base station (BS) to determine the data rate of a transmission (code) block. Such link adaptation effectively eliminates fading-induced outage and provides ergodic throughput in the long run. When there is delay in CQI feedback, however, such knowledge of the channel status is inevitably outdated, and outage becomes problematic again. In this paper, we characterize a future channel in which the reported CQI is actually used as a conditional random variable given current channel observation. The dependence of the future channel to the current observation is captured by channel correlation. By considering an outage event as a failed transmission, we can compute probability of successful transmission for each value of transmission rate to determine the best transmission rate which maximizes the expected throughput. If ergodicity holds for a channel process, then such expected throughput becomes close to an empirical throughput in the long run.
Sponsorship	IEEE Commun. Soc.
Starting Page	4098
Ending Page	4103
File Size	289595
Page Count	6
File Format	PDF
ISBN	9781479913534
DOI	10.1109/GLOCOM.2013.6831715
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-12-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Throughput Fading Wireless communication Delays Transmitters Correlation Signal to noise ratio
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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