دانلود رایگان مقاله به اشتراک گذاری طیف تعاونی کاربران اولیه و ثانویه متعدد

Abstract

This paper proposes a multiple-input multiple-output (MIMO) based cooperative dynamic spectrum access (DSA) framework that enables multiple primary users (PUs) and multiple secondary users (SUs) to cooperate in spectrum sharing. By exploiting MIMO in cooperative DSA, SUs can relay the primary traffic and send their own data at the same time, which greatly improves the performance of both PUs and SUs when compared to the non-MIMO time-division spectrum sharing schemes. Especially, we focus on the relay selection optimization problem among multiple PUs and multiple SUs. The network-wide cooperation and competition are formulated as a bargaining game, and an algorithm is developed to derive the optimal PU-SU relay assignment and resource allocation. Evaluation results show that both primary and secondary users achieve significant utility gains with the proposed framework, which gives all of them incentive for cooperation.

5. Conclusions

In this paper, we present a novel framework that enables multiple PUs and multiple MIMO SUs to cooperate for dynamic spectrum sharing. By leveraging the MIMO capability, SUs help relay the primary traffic while concurrently accessing the PUs’ spectrum to transmit their own data. The optimization algorithm for the PU-SU relay assignment and cooperation is proposed and further analyzed. Evaluation results show that both PUs and SUs can benefit from the proposed framework.