Allocation de Spectre et de Puissance dans les Systèmes Radio Cognitifs

Abstract : This paper investigates a joint spectrum scheduling and power allocation problem in Cognitive Radio (CR) networks composed of several secondary (SUs) and primary users (PUs). The objective is to minimize the overall SU system power consumption under minimum Quality of Service (QoS) constraints, maximum peak and average interference to the PUs constraints. Given the opposing nature of these constraints, we first study the problem feasibility and we provide sufficient and necessary conditions for the existence of a solution. The main challenge lies in the non-convexity of the problem because of the discrete spectrum scheduling policies. We overcome this issue by devicing a simpler and convex problem based on Lagrangian relaxation. It turns out that, this problem has discrete solutions which are the optimal solutions to our initial non-convex problem. We propose an iterative sub-gradient algorithm to compute the optimal solution, when it exists. Several numerical results that sustain and give insight into the resolution of this problem are also provided.
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Contributor : Elena Veronica Belmega <>
Submitted on : Thursday, April 28, 2016 - 3:32:07 PM
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Raouia Masmoudi, Elena Veronica Belmega, Inbar Fijalkow, Noura Sellami. Allocation de Spectre et de Puissance dans les Systèmes Radio Cognitifs. XXVème Colloque Gretsi, Sep 2015, Lyon, France. ⟨hal-01308908⟩



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