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Intelligent Reflecting Surfaces and Spectrum Sensing for Cognitive Radio Networks
IEEE Transactions on Cognitive Communications and Networking ( IF 8.6 ) Pub Date : 2022-04-29 , DOI: 10.1109/tccn.2022.3171212
A. Nasser 1 , H. Al Haj Hassan 2 , A. Mansour 3 , K. C. Yao 4 , L. Nuaymi 5
Affiliation  

In Cognitive Radio (CR) networks, Primary User (PU) and Secondary User (SU) coexist to efficiently share the spectrum. PU has the right to access its dedicated channel at any time, while SU, operating in an opportunistic mode. can access only when PU is absent. Thus, SU should continuously monitor the channel to avoid any interference with PU when transmitting. Several factors, such as fading and shadowing adversely impact the PU SNR at the SU receiver making the Spectrum Sensing (SS) process more challenging. Recently, Intelligent Reflecting Surface (IRS) has been proposed to control the propagation channel for wireless systems. Introducing IRS in CR networks impacts the SS performance because of altering the channel. In this paper, we investigate the effect of deploying IRS on the SS by considering two scenarios: in (S1) the IRS is configured to enhance the PU signal at SU, while in the second scenario (S2), the IRS is configured to assist the Primary Receiver (PR). First, we highlight several important challenges and research directions. Then, we derive the analytical average detection probability for both (S1) and (S2). Results show that deploying IRS can significantly enhance SS even when the IRS is deployed to assist the PR.

中文翻译:

认知无线电网络的智能反射面和频谱传感

在认知无线电 (CR) 网络中,主要用户 (PU) 和次要用户 (SU) 共存以有效共享频谱。PU 有权随时访问其专用频道,而 SU 则以机会主义模式运行。只有在没有PU的情况下才能访问。因此,SU 应持续监控信道,以避免在传输时对 PU 造成任何干扰。衰落和阴影等几个因素会对 SU 接收器的 PU SNR 产生不利影响,从而使频谱感知 (SS) 过程更具挑战性。最近,已经提出智能反射面(IRS)来控制无线系统的传播信道。由于改变信道,在 CR 网络中引入 IRS 会影响 SS 性能。在本文中,我们通过考虑两种情况来研究在 SS 上部署 IRS 的效果:在(S1)中,IRS被配置为增强SU处的PU信号,而在第二种情况(S2)中,IRS被配置为辅助主接收器(PR)。首先,我们强调几个重要的挑战和研究方向。然后,我们得出 (S1) 和 (S2) 的分析平均检测概率。结果表明,即使部署 IRS 来协助 PR,部署 IRS 也可以显着增强 SS。
更新日期:2022-04-29
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