Parallel continuous-time ΔΣ ADC for OFDM UWB receivers
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Wideband, bandpass, and versatile hybrid filter bank A/D conversion for software radio
IEEE Transactions on Circuits and Systems Part I: Regular Papers - Special section on 2008 custom integrated circuits conference (CICC 2008)
High-Level Design Approach for the Specification of Cognitive Radio Equipments Management APIs
Journal of Network and Systems Management
A Homogeneous MPSoC with Dynamic Task Mapping for Software Defined Radio
ISVLSI '10 Proceedings of the 2010 IEEE Annual Symposium on VLSI
Emerging cognitive radio applications: A survey
IEEE Communications Magazine
International standardization of cognitive radio systems
IEEE Communications Magazine
Cognitive radio: Ten years of experimentation and development
IEEE Communications Magazine
Cooperative spectrum sensing in cognitive radio networks: A survey
Physical Communication
Multiprocessor System-on-Chip (MPSoC) Technology
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
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Cognitive radio system (CRS) is a radio system which is aware of its operational and geographical environment, established policies, and its internal state. It is able to dynamically and autonomously adapt its operational parameters and protocols and to learn fromits previous experience. Based on software-defined radio (SDR), CRS provides additional flexibility and offers improved efficiency to overall spectrum use. CRS is a disruptive technology targeting very high spectral efficiency. This paper presents an overview and challenges of CRS with focus on radio frequency (RF) section. We summarize the status of the related regulation and standardization activities which are very important for the success of any emerging technology. We point out some key research challenges, especially implementation challenges of cognitive radio (CR). A particular focus is on RF front-end, transceiver, and analog-to-digital and digital-to-analog interfaces which are still a key bottleneck in CRS development.