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In this paper, we investigate the major trade-offs that relates to the energy efficiency in cognitive radio networks. We address five main trade-offs (QoS, network architecture, primary user interference, fairness and security) that are vital since they affect all the components of cognitive radio network's operability, design and implementation. The relationship between these trade-offs and how they...
In this paper we have studied precoding schemes for cognitive radio multiple input multiple output (CR-MIMO) system which coexist with a primary time division duplexing system. We have proposed two robust methods in enhancing the existing sensing projection based scheme (SP-Based precoding scheme). The first proposed scheme is the full projection based precoding scheme (FP-Based precoding). In this...
Cognitive radio networks has been known to be a technique to enhance the utilization of spectrum, where a secondary user can utilize the spectrum of a primary user without causing harmful interference. This paper we have presents an interference model implementing power, contention and hybrid control management schemes. Furthermore; we have investigated how the hidden primary receiver problem on affects...
Due to the increasing demand for the spectrum, the cognitive was proposed to improve the underutilization of the radio spectrum. Under this condition, the secondary users are allowed to share spectrum with the licensed primary user without causing harmful interference to the network. In this paper we studied the interference modeling under two interference management's scheme which is the power control...
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