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Spectrum shortage is a fundamental problem in wireless networks and thisproblem becomes increasingly acute with the rapid proliferation of wirelessdevices. To address this problem, spectrum sharing in the context of cognitiveradio networks (CRNs) has been considered a promising solution. In this paper,we propose a practical spectrum sharing scheme for a small CRN that comprises apair of primary users and a pair of secondary users by leveraging themultiple-input and multiple-output (MIMO) technology. In our scheme, we assumethat the secondary users take full responsibility for cross-networkinterference cancellation (IC). We also assume that the secondary users have noknowledge about the primary network, including its signal waveform, framestructure, and network protocol. The key components of our proposed scheme aretwo MIMO-based interference management techniques: blind beamforming (BBF) andblind interference cancellation (BIC). We have built a prototype of our schemeon a wireless testbed and demonstrated that the prototyped secondary networkcan coexist with commercial Wi-Fi devices (primary users). Experimental resultsfurther show that, for a secondary device with two or three antennas, BBF andBIC achieve an average of 25dB and 33dB IC capability in an office environment,respectively.

A Practical Spectrum Sharing Scheme for Cognitive Radio Networks: Design and Experiments