Provided by: Institute of Electrical & Electronic Engineers
Date Added: Aug 2012
Fast and reliable detection of available channels (i.e., those temporarily unoccupied by primary users) is a fundamental problem in the context of emerging cognitive radio networks, without an adequate solution. The (mean) time to detect idle channels is governed by the front-end bandwidth to be searched for a given resolution bandwidth. Homodyne receiver architectures with a wideband RF front-end followed by suitable channelization and digital signal processing algorithms, are consistent with speedier detection, but also imply the need for very high-speed Analog-to-Digital Converters (ADCs) that are impractical and/or costly.