| Summary: | 碩士 === 國立交通大學 === 電信工程系所 === 97 === Recent studies have been conducted to indicate the ineffective usage of licensed bands due to the static spectrum allocation. In order to improve the spectrum utilization, the cognitive radio is therefore suggested to dynamically exploit the opportunistic primary frequency spectrums. The interference from the secondary users to the primary user consequently draws the attention to the spectrum and power management for the cognitive radio networks. In this paper, the constrained stochastic games are utilized to exploit the optimal policies for power management by considering the variations from both the channel gain and the primary traffic. Both the underlay and overlay waveforms are considered within the network scenarios for the proposed power management scheme. Constraints for allowable interferences will be applied in order to preserve the communication quality among the primary and the secondary users. With the assumption of the Markovian property of dynamic environment, finite and infinite time horizon scenarios are both considered in target function. According to the formulation of the constrained stochastic games, the existence of the constrained Nash equilibrium will be validated with rigorous proofs. Simulation results further validate the correctness of the theoretically-derived policies, compare with the greedy mechanism and examine the effect of channel sensing error for dynamic power management.
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