A Practical Spectrum Sharing Scheme for Cognitive Radio Networks: Design and Experiments
A Practical Spectrum Sharing Scheme for Cognitive Radio Networks: Design and Experiments
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DOI：
10.1109/tnet.2020.2994134
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发表时间：
2020-08-01
影响因子：
3.7
通讯作者：
Zeng, Huacheng
中科院分区：
文献类型：
--
作者：
Sangdeh, Pedram Kheirkhah;Pirayesh, Hossein;Zeng, Huacheng
频谱短缺是无线网络中的一个基本问题，并且随着无线设备的快速扩散，这个问题变得日益尖锐。为了解决这个问题，在认知无线电网络（CRN）的背景下，频谱共享已被视为一个有前途的解决方案。虽然有大量的工作在文献中的频谱共享，大多数现有的工作仅限于理论探索和实际的解决方案设计的进展仍然很少。在本文中，我们提出了一个实用的方案，使透明的频谱共享的小CRN利用多输入多输出（MIMO）技术的最新进展。我们方案的关键组成部分是两种基于MIMO的干扰管理技术：盲波束形成（BBF）和盲干扰消除（BIC）。这两种技术使次要用户能够在缺乏网络间协调、细粒度同步和互知的情况下减轻跨网络干扰。我们已经建立了一个无线测试平台上的原型，我们的计划，并证明其与商业Wi-Fi设备（主要用户）的兼容性。实验结果表明，对于具有两个/三个天线的次级设备，BBF和BIC在真实无线环境中分别实现平均25 dB和33 dB的干扰消除能力。
Spectrum shortage is a fundamental problem in wireless networks, and this problem becomes increasingly acute with the rapid proliferation of wireless devices. To address this issue, spectrum sharing in the context of cognitive radio networks (CRNs) has been regarded as a promising solution. Although there is a large body of work on spectrum sharing in the literature, most existing work is limited to theoretical exploration and the progress in practical solution design remains scarce. In this paper, we propose a practical scheme to enable transparent spectrum sharing for a small CRN by leveraging recent advances in multiple-input multiple-output (MIMO) technology. The key components of our scheme are two MIMO-based interference management techniques: blind beamforming (BBF) and blind interference cancellation (BIC). These two techniques enable secondary users to mitigate cross-network interference in the absence of inter-network coordination, fine-grained synchronization, and mutual knowledge. We have built a prototype of our scheme on a wireless testbed and demonstrated its compatibility with commercial Wi-Fi devices (primary users). Experimental results show that, for a secondary device with two/three antennas, BBF and BIC achieve an average of 25 dB and 33 dB interference cancellation capabilities in real-world wireless environments, respectively.