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