A Practical Underlay Spectrum Sharing Scheme for Cognitive Radio Networks
A Practical Underlay Spectrum Sharing Scheme for Cognitive Radio Networks
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DOI：
10.1109/infocom.2019.8737534
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发表时间：
2019-04
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影响因子：
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通讯作者：
Pedram Kheirkhah Sangdeh;Hossein Pirayesh;Huacheng Zeng;Hongxiang Li
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作者：
Pedram Kheirkhah Sangdeh;Hossein Pirayesh;Huacheng Zeng;Hongxiang Li
随着移动设备的激增导致对无线互联网服务的需求不断增长，频谱短缺问题变得日益严重，频谱共享被认为是解决频谱短缺问题的一个有前途的方法。在本文中，我们提出了一种适用于认知无线电网络（CRN）的实用底层频谱共享方案，其中主要用户不关心次要用户。我们方案的关键组成部分是两种基于 MIMO 的干扰消除 (IC) 技术，用于处理辅助网络侧的跨网络干扰。第一个是用于辅助发射机的盲波束成形技术。该 IC 技术允许辅助发射机消除其对主要用户产生的干扰，而无需信道状态信息 (CSI)。第二种是用于辅助接收器的盲干扰消除（BIC）技术。该 IC 技术使辅助接收器能够在存在来自主发射器的强烈未知干扰的情况下解码其所需信号。基于这两种基于 MIMO 的 IC 技术，我们为辅助网络开发了 MAC 协议，以实现 CRN 中的底层频谱共享。我们已经在 GNURadio-USRP2 无线测试平台上实施了所提议的底层频谱共享方案。实验结果表明，在真实办公楼环境中，次要用户可以实现平均 1 bit/s/Hz 的频谱效率，而不会降低主要用户的性能。
As the proliferation of mobile devices has led to an ever-growing demand for wireless Internet services, the spectrum shortage issue becomes increasingly severe and spectrum sharing is regarded as a promising approach to addressing the spectrum shortage issue. In this paper, we propose a practical underlay spectrum sharing scheme for cognitive radio networks (CRNs) where the primary users are oblivious to the secondary users. The key components of our scheme are two MIMO-based interference cancellation (IC) techniques to handle cross-network interference on the secondary network side. The first one is a blind beamforming technique for secondary transmitters. This IC technique allows a secondary transmitter to nullify its generated interference for primary users without requiring channel state information (CSI). The second one is a blind interference cancellation (BIC) technique for secondary receivers. This IC technique enables a secondary receiver to decode its desired signal in the presence of strong unknown interference from primary transmitters. Based on these two MIMO-based IC techniques, we develop a MAC protocol for the secondary network to enable underlay spectrum sharing in CRNs. We have implemented the proposed underlay spectrum sharing scheme on a GNURadio-USRP2 wireless testbed. Experimental results show that the secondary users can achieve an average of 1 bit/s/Hz spectrum efficiency without degrading the performance of the primary users in a real-world office building environment.