NDLI: Multi-user diversity in a spectrum sharing system

Content Provider	IEEE Xplore Digital Library
Author	Tae Won Ban Wan Choi Bang Chul Jung Dan Keun Sung
Copyright Year	2002
Abstract	We investigate the effects of multi-user diversity in a spectrum sharing system where secondary users restrictively utilize a spectrum licensed to primary users only if interference perceived at primary users is regulated below a predetermined level. This interference regulation affects the characteristics of multiuser diversity gains previously known in non-spectrum sharing systems. Our numerical and analytical results show that the multiuser diversity gain in a spectrum sharing system increases differently according to conditions given by the transmit power of secondary users, P, and a predetermined interference temperature, Q - if P is sufficiently larger than Q, the multiuser diversity gain in terms of capacity scales like log₂ (W (N_s)) similarly to a previously known scaling law in the non-spectrum sharing systems, where W(middot) and N_s denote a Lambert W function and the number of secondary transmitters, respectively. However, the scaling law of multiuser diversity gain becomes log₂(N_s) as P becomes sufficiently larger such that P Gt QN_s.
Starting Page	102
Ending Page	106
Page Count	5
File Size	348216
File Format	PDF
ISSN	15361276
Volume Number	8
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Diversity methods Temperature Rayleigh channels Radio transmitters Cognitive radio Chromium Information technology Frequency measurement Time measurement multiuser diversity Spectrum sharing cognitive radio
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Electrical and Electronic Engineering Computer Science Applications

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