1. Centralized spectrum leasing via cooperative SU assignment in cognitive radio networks.
- Author
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Hou Deng, Liusheng Huang, Chenkai Yang, and Hongli Xu
- Subjects
- *
RADIO frequency allocation , *CHANNEL capacity (Telecommunications) , *WIRELESS cooperative communication , *EVOLUTIONARILY stable strategy - Abstract
As the increasing demand of the radio spectrum, the researchers pay more attention to the technology of cognitive radio networks to improve the use of the scarce spectrum resources. Recently, cooperative communications combining with cognitive radio have been proposed in many literatures to improve the channel capacity. The primary users with poor transmission environment transmit their packets with the assistance of the secondary users (SUs) by offering them spectrum resources. This paper first raises issues in existing works, such as non-optimal selection, selection collision, and transmission interruption. Aiming at these issues, we design a centralized system model and a cooperative relaying protocol for multiple primary user pairs to dynamically lease spectrum in exchange for the transmission assistance of SUs. Then we define 2 problems of the cooperative SU assignment to maximize total rate and maximize number of assigned SUs. We prove they are NP-hard and propose a local search algorithm for the objective of maximize total rate and a 1/2 approximation algorithm for another objective. Our simulation results show that our system and algorithms can effectively improve the performance of the wireless networks. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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