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Network function virtualization (NFV) offers the potential for both enhancing service delivery flexibility and reducing overall costs by virtualizing network functions that are traditionally implemented in dedicated hardware. However, the flexibility of NFV comes with considerable compromises since virtual machine carried functions could introduce significant performance overhead. In this paper, we...
Interface engineering is a critical strategy for improving the performance of both polymer and organometal trihalide perovskite (e.g., CH3NH3PbI3) solar cells. A good interfacial material should fulfill several requirements including 1) good charge selectivity to improve the charge collection efficiency at the corresponding electrodes, 2) matched energy levels with the conduction band and valence...
Regulatory information and sensing information are used to determine available spectrum (white spaces) and to facilitate dynamic spectrum access. This paper analyses the effect of a local white spaces database called sensing database (SDB) which relays regulatory information from regulatory database and contains sensing related information obtained by distributed sensing schemes. Since the SDB is...
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.
In this paper we investigate spectrum sensing for cognitive radio (CR) by using multiple spectrum sensors. We explore sensing schemes based on soft information combining, hard information combining and a two-stage detection scheme that uses both soft information combining and hard information combining. The two-stage detection scheme is shown to provide improved performance compared to sensing based...
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