Abstract
In recent years, there has been a rapid evolution of wireless technologies that has led to the challenge of high demand for spectral resources. To overcome this challenge, good spectrum management is required that calls for more efficient use of the spectrum. In this paper, we present a general system, which makes a tradeoff between the spectral efficiency (SE) and energy efficiency (EE) in the cellular cognitive radio networks (CCRN) with their respective limits. We have analyzed the system taking into account the different types of power used in the CCRN, namely the spectrum detection power (Zs) and the relay power (Zr). Optimal policy for emission power allocation formulated in the function of sub-channel activity index (SAI) as an optimization problem in order to maximize spectrum utilization and minimize the energy consumption in the base station of the secondary system energy consumption, is subject to different constraints of the main user system. We also evaluate the collaborative activity index of the sub-channel describing the activity of the primary users in the CCRN. The theoretical analyses and simulation results sufficiently demonstrate that the SE and EE relationship in the CCRN is not contrary and thus the achievement of optimal tradeoff between SE and EE. By making a rapprochement with a cognitive cellular network where SBSs adopts an equal power allocation strategy for sub-channels, the results of our proposed scheme indicate a significant improvement. Therefore, the model proposed in this paper offers a better tradeoff between SE and EE.
Highlights
The concept of cognitive radio contributes to the establishment of a new generation network, it provides radio equipment with intelligent learning and decision-making capabilities so that it is aware of the state of its environment and to adjust its operating parameters to that state [1,2]
We find that when the relay factor θ increases, the cellular cognitive radio networks (CCRN) consume a lot of energy to allow them to transmit PU data
This paper presented the tradeoff between spectral efficiency (SE) and EE for CCRNs
Summary
The concept of cognitive radio contributes to the establishment of a new generation network, it provides radio equipment with intelligent learning and decision-making capabilities so that it is aware of the state of its environment and to adjust its operating parameters to that state [1,2]. In view of the increase in the number of users and the scarcity of spectral resources set by the Federal Communications Commission (FCC) [3,4], this concept gives the opportunity to unlicensed terminal users to use them, by adjusting their parameters to the new frequency bands. Cognitive radio technology allows unlicensed users (secondary users, SUs) to transmit in licensed frequency bands without disrupting the quality of service (QoS) of licensed users (primary users, PUs) transmission in order to make efficient use of the spectral band [5,6].
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