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This paper presents an efficient beamforming technique for secondary cognitive radio network deployed in the coverage region of a cellular network. In cognitive network, it must be ensured that secondary users (SUs) do not cause any harmful interference to the primary users (PUs). To keep this in mind, we have formulated a new beamforming problem for the(More)
In our paper, we have addressed the power control issue of the cognitive radio network maintaining insignificant interference level to the primary users (PUs) as the power control algorithms ensure less interference to PUs as well as maximum SINRs for all secondary users (SUs) minimizing the total transmitting power of the secondary network. Power control(More)
—In this paper, the authors have explored the idea of secondary spectrum access by using cognitive radios (CR) in a secondary network deployed in the region of a wireless cellular network. In the CR network, secondary users (SUs) opportunistically access the underutilized spectrum owned by the licensed primary users (PUs) of the cellular network for their(More)
In recent days intense research is taking place on energy efficiency (EE) of a multi-user wireless network. In this paper we propose a model to detect EE based on limited user traffic model. We observe the variation of EE against the number of users and energy signal to noise ratio engaged by the user. The impact of enhancement of subcarriers on EE and(More)
This paper addresses a cognitive radio (CR) network scenario where a relay is assigned to mitigate interference to primary users (PUs). We develop an average probability of successful secondary transmission (PSST) to introduce relay in the CR network. The power allocation is done using dual domain concept to maximize the system throughput as well as(More)
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