Multi-User Diversity in a Spectrum Sharing System

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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 (Ns)) similarly to a previously known scaling law in the non-spectrum sharing systems, where W(·) and Ns denote a Lambert W function and the number of secondary transmitters, respectively. However, the scaling law of multiuser diversity gain becomes log2(Ns) as P becomes sufficiently larger such that P  QNs.
Publisher
IEEE
Issue Date
2009-01
Keywords

Spectrum sharing; cognitive radio; multiuser diversity

Citation

IEEE Transactions on Wireless Communications, Vol.8, No.1

ISSN
1536-1276
DOI
10.1109/T-WC.2009.080326
URI
http://hdl.handle.net/10203/22597
Appears in Collection
EE-Journal Papers(저널논문)
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