NDLI: Optimal SIR target determination for outer-loop control in the W-CDMA system

Content Provider	IEEE Xplore Digital Library
Author	Lopez-Medrano, A.
Copyright Year	2004
Description	Author affiliation: Top Optimized Technol. S.L., Madrid, Spain (Lopez-Medrano, A.)
Abstract	In interference limited cellular radio systems, the control of target signal-to-interference (SIR) ratios in the outer loop in order to satisfy a given quality criteria, is a challenge due to the changing fading characteristics of the radio channel. The performance of the systems based on the commonly adopted technique of relatively infrequent frame error rate (FER) measurements is very deteriorated under dynamic environments. The method for the outer loop presented in this paper, exploits the knowledge of SIR fading stochastic models (Suzuki or Loo models for the desired signal, and Gaussian distribution for the interference) to on-line tune the mentioned target value. Thus, the Newton-Raphson method is applied to numerical approximations of the SIR cumulative distribution functions (CDF's), so that it is possible to obtain the minimum SIR target fade margin that satisfies a given outage probability specification (quality criteria) for that link and for second order statistical moments (shadowing variance, Rice Factor...) which are estimated dynamically. The validity of the SIR CDF's numerical approximations derived has been tested throughout comparison of their plots with the existent ones. The outage probability obtained from those numerical approximations for given values of the SIR margin and second order statistical moments, is then used as input of the Newton-Raphson process. The outcome of this process is, as desired, the previously mentioned SIR margin value. The method performance has been tested under a realtime UMTS demonstrator developed within the IST ARROWS (advanced radio resource management on wireless services) European Collaborative project. The outcomes from the dynamic simulation show that the outer loop method proposed here is able to maintain the QoS required under dynamic environments.
Starting Page	2375
Ending Page	2380
File Size	392766
Page Count	6
File Format	PDF
ISBN	0780379543
ISSN	10903038
DOI	10.1109/VETECF.2003.1285955
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optimal control Control systems Multiaccess communication Interference Fading Probability Testing Land mobile radio cellular systems Radio control Error analysis
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in