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http://dx.doi.org/10.3837/tiis.2022.04.016

Spectrum- and Energy- Efficiency Analysis Under Sensing Delay Constraint for Cognitive Unmanned Aerial Vehicle Networks  

Zhang, Jia (School of Communication Engineering, Hangzhou Dianzi University)
Wu, Jun (School of Communication Engineering, Hangzhou Dianzi University)
Chen, Zehao (School of Communication Engineering, Hangzhou Dianzi University)
Chen, Ze (School of Communication Engineering, Hangzhou Dianzi University)
Gan, Jipeng (School of Communication Engineering, Hangzhou Dianzi University)
He, Jiangtao (School of Communication Engineering, Hangzhou Dianzi University)
Wang, Bangyu (School of Communication Engineering, Hangzhou Dianzi University)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.16, no.4, 2022 , pp. 1392-1413 More about this Journal
Abstract
In order to meet the rapid development of the unmanned aerial vehicle (UAV) communication needs, cooperative spectrum sensing (CSS) helps to identify unused spectrum for the primary users (PU). However, multi-UAV mode (MUM) requires the large communication resource in a cognitive UAV network, resulting in a severe decline of spectrum efficiency (SE) and energy efficiency (EE) and increase of energy consumption (EC). On this account, we extend the traditional 2D spectrum space to 3D spectrum space for the UAV network scenario and enable UAVs to proceed with spectrum sensing behaviors in this paper, and propose a novel multi-slot mode (MSM), in which the sensing slot is divided into multiple mini-slots within a UAV. Then, the CSS process is developed into a composite hypothesis testing problem. Furthermore, to improve SE and EE and reduce EC, we use the sequential detection to make a global decision about the PU channel status. Based on this, we also consider a truncation scenario of the sequential detection under the sensing delay constraint, and further derive a closed-form performance expression, in terms of the CSS performance and cooperative efficiency. At last, the simulation results verify that the performance and cooperative efficiency of MSM outperforms that of the traditional MUM in a low EC.
Keywords
Unmanned aerial vehicle; cooperative spectrum sensing; spectrum efficiency; energy efficiency; sensing delay constraint;
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