Patent
A method for database driven channel quality estimation in a cognitive radio network
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TLDR
In this article, a method of determining operating parameters for a secondary system transmitter is described, where the transmitter characteristics, including location and operating frequency band, are provided to a geo-location database, which determines the maximum allowable transmission power that meets various specifications for different channels and conveys the power and channel(s) to the transmitter.Abstract:
A method of determining operating parameters for a secondary system transmitter is described. The transmitter characteristics, including location and operating frequency band, are provided to a geo-location database. The database determines the maximum allowable transmission power that meets various specifications for different channels and conveys the power and channel(s) to the transmitter. The database estimates channel incumbent signal strengths based on the transmitter location and primary and higher-priority secondary incumbent systems, estimates the splatter levels, determines whether adjacent and co-channel interference protection ratios are met, and adjusts the allowable power level accordingly. The database also estimates aggregate co- and adjacent channel primary and secondary incumbent system interference levels at the transmitter location and predicts channel quality for each allowable channel. The estimated levels are updated using measurements of actual levels at the transmitter location. The database dynamically allocates channels using the secondary system priorities.read more
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TL;DR: It is shown in the paper that collaboration among nodes leads to more efficient spectrum utilization from a system-level point of view, while decreasing computational complexity of detection algorithms at the individual sensing nodes.
Proceedings ArticleDOI
Cluster-Based Cooperative Spectrum Sensing in Cognitive Radio Systems
Chunhua Sun,Wei Zhang,K. Ben +2 more
TL;DR: By separating all the secondary users into a few clusters and selecting the most favorable user in each cluster to report to the common receiver, the proposed method can exploit the user selection diversity so that the sensing performance can be enhanced.
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Apparatus for exchanging data between a central station and a plurality of wireless remote stations on a time divided commnication channel
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Power Control in Cognitive Radio Systems Based on Spectrum Sensing Side Information
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