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The evolution of future wireless communication systems imposes a strong requirement on the efficiency of spectrum usage, which is expected to be leveraged by interacting and cooperating cognitive radios forming wider cognitive radio systems. Dynamic spectrum access is a potential means to improve spectrum usage. A key step in realizing DSA is to obtain spectral occupancy information provided by spectrum...
This paper addresses the issues of coexistence for cognitive radio networks including both the coexistence between primary users (PUs) and secondary users (SUs), as well as the coexistence among SUs. The coexistence between SUs and PUs addresses the interference from SUs to PUs, whereas, the coexistence among SUs addresses sharing of identified spectrum opportunity among SUs to achieve efficient spectrum...
This paper presents the types and classes of sensing related information to be exchanged among the entities in cognitive radio systems. The information was extracted by analyzing distributed spectrum sensing use cases and has been checked for the consistence with available sensing techniques and sensors' capability. This paper also introduces IEEE P1900.6 WG recent activities on standardizing the...
This paper introduces recent R&D on distributed spectrum sensing, the use cases for distributed sensing approach and the need of exchanging sensing related information among different devices in a cognitive radio system for dynamic spectrum access. This paper also shows the latest standardization activities on the interface for sensing information exchange between the sensors and their clients.
This paper introduces NICT's two current on-going projects regarding heterogeneous type and spectrum sharing type cognitive wireless network: Project CWC (Cognitive Wireless Cloud) and Project ASTRA (Advanced Spectrum-Management Technology for Radio Access innovation). For both projects, this paper summarizes the scope, usage model, system requirement, system architecture, prototyping, and standard...
Cognitive radio(CR) has become an enabling technology to realize dynamic spectrum access through its spectrum sensing and reconfigurable capability. Robust and reliable spectrum sensing is needed to discover spectrum opportunity. Single cognitive radios often fail to provide such reliable information due to their inherent sensitivity limitation. Primary signals that are subject to detection by cognitive...
This paper introduces two cognitive radio (CR) systems: (a) heterogeneous type CR and (b) spectrum sharing type CR regarding its definition, usage model, fundamental system architecture, and developed prototype.
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