Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Dynamic spectrum leasing in cognitive radio networks via primary-secondary user power control games
IEEE Transactions on Wireless Communications
Approaches to spectrum sharing
IEEE Communications Magazine
A framework for uplink power control in cellular radio systems
IEEE Journal on Selected Areas in Communications
Wireless Personal Communications: An International Journal
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Efficient resource allocation is a major challenge in cognitive radio networks, especially when Cognitive Users (CUs) share the same frequency band with the Primary User. In this paper, we consider minimizing the total power consumption by combining power control, rate control and adaptive modulation. We analyze the existence, uniqueness and Pareto optimality of Nash Equilibrium (NE) in the power control game, and propose an iterative algorithm to find the NE followed by the adjustment of both the transmission rate and modulation scheme based on the convergent power. If compared with previous works, the key feature of the proposed strategy is that each CU can prolong its battery life in energy-constrained networks to support heterogenous services with different transmission rates and modulation schemes requirements. Simulation results are provided to confirm the effectiveness of the proposed method in power saving, improvement of both the transmission rate and the spectral efficiency and the simplicity of implementation.