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This paper investigates joint relay selection (RS) and power allocation (PA) in cognitive radio (CR) systems, in which relay nodes operate in amplify-and-forward (AF) mode. In contrast to the conventional schemes, we take into account the performance of the secondary user (SU) which acts as the relay. A two-step optimization scheme is proposed to maximize system throughput with minimum rate guarantees...
In this paper, we address the issue of power allocation in a relay-based cognitive radio network. The power allocation approach analyzed here maximizes the system throughput while maintaining interference to a tolerable limit. We modify the approach to achieve a higher convergence rate. Later we further propose a near optimal power allocation approach that significantly lowers the computational complexity...
In this paper an adaptive resource allocation algorithm in OFDMA based cognitive radio (CR) system is proposed that not only meets the quality of service (QoS) of real-time (RT) services but also increases the dynamic capacity of the system. In contrast to existing algorithms for multi-user OFDM systems which are unable to guarantee maximum sum data rate when applied to CR system in real-time, the...
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