Spectrum Sharing by Adaptive Transmit Power Control for Low Priority Systems and Achievable Capacity

Hiromasa FUJII

IEICE TRANSACTIONS on Communications   Vol.E92-B    No.8    pp.2568-2576
Publication Date: 2009/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2568
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Fundamental Theories for Communications
spectrum sharing,  capacity,  system priorities,  transmit power control,  

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A spectrum sharing method is proposed for systems that share the same frequency band or adjacent bands with services that have different priorities. The proposed method adaptively controls transmission power according to information provided by the high-priority system receivers. We give the theoretical capacities achieved by low-priority systems when the proposed method and a conventional method (constant transmit power) are applied. Numerical results confirm that the proposed method attains 1.5-2 times larger capacity than the conventional method.