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Steady-state visual evoked potentials (SSVEP) are a class of signals obtained from the electroencephalogram (EEG) that are used in conjunction with brain-computer interfaces (BCIs). Inducing SSVEP signals requires flickering lights as stimuli, typically in the range of 5–45 Hz. However, due to low signal-to-noise ratio (SNR), SSVEP signals generated in certain frequency ranges can be difficult to...
Cognitive Radio (CR) is a new concept in wireless communication systems that aims at enabling opportunistic spectrum access (OSA) to licensed frequencies by secondary users (SU). Specifically, CR systems are expected to detect idle periods when licensed spectrum is not used by primary users (PU), to take advantage of them for providing service to SU, and to release them when PU become active. Thus,...
Cognitive radios (CR) that sense spectrum usage and adjust their transmissions to meet specified spectral constraints have been proposed for use in future generations of wireless systems to enable dynamic access to the frequency spectrum. In cooperative spectrum sensing, a fusion center (FC) receives local sensing information from multiple CRs and combines it to provide better decision on the spectrum...
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