Rate enhancement in cognitive radio networks using multi-level power transmission strategy
Shabnam Khomejani, Huan Xuan Nguyen, Arumugam Nallanathan, Hamid Aghvami · 2016
In this paper, we consider a multi-level power allocation scheme for cognitive users in the cognitive radio networks. The proposed system uses a new frame structure to improve overall throughput of the cognitive radio systems. We propose a strategy in which, the licensed user can transmit with multiple levels of power which seems to be more realistic and practical. In this work, the proposed strategy also allows cognitive users to choose different power levels according to their receiving energy. The optimal achievable rate under the constraints of average transmit power at the cognitive users and average interference temperature to the licensed users is investigated. Simulation results indicate the enhancement in the throughput of the system compared to conventional strategy.