Title :
Challenges in the design of cognitive radios1
Author_Institution :
Electr. Eng. Dept., Univ. of California, Los Angeles, CA, USA
Abstract :
Cognitive radios are expected to perform spectrum sensing and communication in the frequency range of tens of megahertz to about 10 GHz. As such, they pose tough architecture and circuit design problems. This paper deals with issues such as broadband, low-noise amplification, multi-decade carrier frequency synthesis, and spectrum sensing. The paper also describes the effect of nonlinearity and local oscillator harmonics, demonstrating that cognitive radios entail more difficult challenges than do software-defined radios. Multi-decade synthesis techniques and RF-assisted sensing methods are also presented.
Keywords :
cognitive radio; spread spectrum communication; RF-assisted sensing methods; circuit design; cognitive radio; local oscillator harmonics; low-noise amplification; multidecade carrier frequency synthesis; multidecade synthesis techniques; nonlinearity effect; Circuit testing; Circuit topology; Cognitive radio; Delay; Frequency measurement; Inverters; MOS devices; Ring oscillators; Spatial resolution; Tiles;
Conference_Titel :
Custom Integrated Circuits Conference, 2009. CICC '09. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-4071-9
Electronic_ISBN :
978-1-4244-4073-3
DOI :
10.1109/CICC.2009.5280806
