有效利用频谱: Efficient Use of the Spectrum.pdf

Demand for effi cient operation of radio frequency (RF) devices with limited resources,
such as energy and frequency spectrum, is increasing as a variety
of wireless applications quickly become more popular. Cognitive radio (CR),
which can sense a radio environment and use an unoccupied spectrum, is
thought to be a drastic solution for problems such as battery life shortage and/
or spectrum scarcity. This article presents a brief overview of CR systems and describes design
challenges for implementing RF integrated circuits (RFICs). A design example of a wideband
CMOS receiver for such systems is also discussed.

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非常好的资料啊