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Cognitive Radio Algorithm

Cognitive radio is a new technology which is being developed to bring greater efficiency, speed and reliability to users of wireless devices. The number of high powered wireless devices coming on to the market is increasing exponentially placing an unprecedented demand on the limited radio spectrum. Cognitive radio technology is seen as a potential solution to this problem as it identifies unused frequencies in a local area and switches a device to this temporarily to provide users with uninterrupted and faster mobile services.

The Manual on Cognitive Radio Simulation (3.5 MB) has been developed to aid technical studies into this new technology. The manual sets out how SEAMCAT can be used for spectrum sensing where the interfering devices (It) try to detect the presence of protected services (e.g. the Wt) transmitting in each of the potentially available channels.

Spectrum sensing essentially involves conducting a measurement within a candidate channel to determine whether any protected service is present and transmitting. When a channel is determined to be vacant, sensing is typically applied to adjacent channels to identify what constraints there might be on transmission power, if any.

A key parameter for spectrum sensing is the detection threshold that is used by a cognitive device to detect the presence or the absence of a protected service’s transmission. If it detects no emission above this threshold in a channel, the white space device (WSD, i.e. the It) is allowed to transmit, otherwise the WSD keeps silent or look into other channels.

SEAMCAT allows studying this phenomenon with its implementation of the algorithm. SEAMCAT enables multiple cognitive radio systems. The cognitive radio feature mainly introduces the detection threshold and the selection of the operating frequency of the WSD.

Example of the Cognitive Radio GUI selection

Example of some of the Cognitive Radio input settings

Here is an example of Initial results of the SEAMCAT simulations using new CRS module with the workspace (revised 16 October 2012 - removal of the propagation plugin causing problem to load on version 4)