NDLI: Spectrum Sharing on a Wideband Fading Channel with Limited Feedback

Content Provider	IEEE Xplore Digital Library
Author	Agarwal, Manish Honig, Michael L.
Copyright Year	2007
Description	Author affiliation: Dept. of EECS, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 USA, m-agarwal@northwestern.edu (Agarwal, Manish) \|\| Dept. of EECS, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 USA, mh@northwestern.edu (Honig, Michael L.)
Abstract	We consider a multiple access, doubly-selective block Rayleigh fading channel in which the users coordinate spectrum sharing through a limited feedback scheme. Each user probes a random set of sub-channels, known to the receiver, by sending a pilot sequence at the beginning of each coherence block. Multiple users may probe the same sub-channel, causing interference. The receiver assigns each sub-channel to the user with the highest estimated sub-channel gain (via limited feedback), provided that this gain exceeds a predetermined threshold. Our problem is to optimize the number of channels to probe, or "probing bandwidth", for each user. We maximize a lower bound on the ergodic capacity, and consider a large system limit in which the system bandwidth and number of users scale linearly with the coherence time. We show that the optimal probing bandwidth grows as O N/(log $N)^{2},$ assuming a linear Minimum Mean Square Error channel estimator, and the achievable rate increases as O (log log N) per user, where N is the number of available subchannels. In contrast, if the users are pre-assigned nonoverlapping subchannels on which they probe and transmit, then the capacity per user converges to a constant as N becomes large. Additionally, the optimal training length and training power are computed and the effect of system load (number of users per unit coherence time) on the achievable rate is studied.
Starting Page	19
Ending Page	26
File Size	784254
Page Count	8
File Format	PDF
ISBN	9781424408146
DOI	10.1109/CROWNCOM.2007.4549766
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-08-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Transmitters Feedback Interference Coherence Bandwidth Rayleigh channels Frequency diversity Probes Wideband
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