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Journal of Computer Networks and Communications
Volume 2012, Article ID 510942, 9 pages
http://dx.doi.org/10.1155/2012/510942
Research Article

Cognitive Code-Division Channelization with Admission Control

1Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA
2ANDRO Computational Solutions, 7902 Turin Road Bldg. 2, Rome, NY 13440, USA

Received 14 February 2012; Revised 9 May 2012; Accepted 9 May 2012

Academic Editor: Enrico Del Re

Copyright © 2012 Kanke Gao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We consider the problem of joint resource allocation and admission control in a secondary code-division network coexisting with a narrowband primary system. Our objective is to find the maximum number of admitted secondary links and then find the optimal transmitting powers and code sequences of those secondary links such that the total energy consumption of the secondary network is minimized subject to the conditions that primary interference temperature constraints, secondary signal-to-interference-plus-noise ratio (SINR) constraints and secondary peak power constraints are all satisfied. This is an NP-hard optimization problem which motivates the development of suboptimal algorithms. We propose a novel iterative algorithm to solve this problem in a computationally efficient manner. Numerical results demonstrate that the proposed algorithm provides excellent solutions that result in high energy efficiency and large admitted percentage of secondary links.