Multi-user diversity in a spectrum sharing system

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 characte...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2009-01, Vol.8 (1), p.102-106
Main Authors: TAE WON BAN, CHOI, Wan, BANG CHUL JUNG, DAN KEUN SUNG
Format: Article
Language:English
Subjects:
Applied sciences
Chromium
Cognitive radio
Control
Diversity methods
Exact sciences and technology
Frequency measurement
Gain
Information technology
Interference
Law
Mathematical analysis
Mathematical models
multiuser diversity
Radio transmitters
Radiocommunication specific techniques
Radiocommunications
Rayleigh channels
Spectrum sharing
Studies
Telecommunications
Telecommunications and information theory
Temperature
Time measurement
Transmitters
Transmitters. Receivers
Wireless communication
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Summary: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 log 2 (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 log 2 (N s ) as P becomes sufficiently larger such that P Gt QN s .
ISSN:1536-1276
1558-2248
DOI:10.1109/T-WC.2009.080326