NDLI: Uniform Power Allocation with Thresholding over Rayleigh Slow Fading Channels with QAM Inputs

Content Provider	IEEE Xplore Digital Library
Author	Hwanjoon Kwon Young-Han Kim Rao, B.D.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of California, San Diego, La Jolla, CA, USA (Hwanjoon Kwon; Young-Han Kim; Rao, B.D.)
Abstract	In this paper, we consider the power allocation problem that minimizes the outage probability for Rayleigh slow fading channels with equiprobable QAM inputs. We focus on the uniform power allocation with thresholding (UPAT) policy that assigns nonzero constant power only to a subset of the subchannels. This simple suboptimal policy can significantly alleviate the feedback overhead and the complexity compared to the optimal mercury/water-filling (MWF) solution. Through asymptotic analysis and numerical simulations, we first show that the optimal UPAT, namely, the UPAT with the optimal threshold, performs close to MWF if the constellation size M is large enough that $log_{2}$ M ≫ R, where R is the fixed target transmission rate. This condition $log_{2}$ M ≫ R turns out to define a natural system operating point. As we show through numerical results, if $log_{2}M$ ≈ R, both MWF and the optimal UPAT perform poorly due to having too small M and their performance can be significantly improved by using a larger M. From these results, we conclude that for a given target transmission rate, the optimal UPAT performs close to MWF as long as the constellation size is chosen appropriately not to limit the performance.
Starting Page	1
Ending Page	5
File Size	329129
Page Count	5
File Format	PDF
ISBN	9781467361873
ISSN	10903038
DOI	10.1109/VTCFall.2013.6692451
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resource management Gain Quadrature amplitude modulation Phase shift keying Fading Vectors Measurement
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