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Fast and accurate spectrum sensing is one of the most important functions in a cognitive radio (CR) seeking to use the licensed but unoccupied spectrum segments. In this paper, we present a fully integrated CMOS receiver with a CR spectrum sensing capability in the UHF band. We propose multi-resolution spectrum sensing (MRSS), which is a digitally-assisted analog energy detection technique. Without...
In this paper, a fully-integrated synchronizable AWG for radar pulse compression is presented. For low power operation, we suggested the two-layered x-decoder scheme which includes address increment circuits so that HOaddr buffers need not to be operated in generating the repetitive waveforms. This can save the power consumption of HOaddr buffer by about 9-18% depending on HOaddr toggling ratio. The...
Cognitive radio (CR) technology has been proposed as a promising solution for maximizing the utilization of already-crowded spectrum resources. As new algorithms, circuits and systems are developed for CR technology, it is essential to have a reconfigurable testbed system for their verification. A multistandard, fully software driven, cross-layer CR testbed has been developed to support thorough testing...
Recently, cognitive radio (CR) technology has been proposed as a way of increasing spectrum utilization efficiency. A CR system seeks to use the unoccupied spectrum segments by sensing the spectrum before transmitting to preserve the rights of privileged primary users (Haykin, 2006). IEEE 802.22 is the working group on wireless regional area network (WRAN) for the license-exempt use of the U.S. TV...
Pulse compression is commonly used in radar applications to improve range resolution while keeping transmitted peak power low. Conventional approach is either using SAW devices or fast convolution processing, but either solution has significant drawbacks. In this work, analog pulse compressor based on analog matched filter has been proposed using a digital waveform generator and an analog correlator...
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