Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TF4
Session:
Number:3TF4-2
Channel Selective RF Receiver with Spectrum Sensing System
Kyoung-Joo Lee, Hee-Jong Lee, Seok-Jae Lee, Jun Lee, Jongsik Lim, Young-Sik Kim, Sang-Min Han,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
In recent, an efficient spectrum management has been issued for a limited frequency resource. Cognitive Radio (CR) technologies have been studied and suggested to allocate channels adaptively by checking the signal existence at each channel. However, the most of the CR technologies reported on the IEEE 802.22 standard are based on digital processing from down-converted baseband signal. Although these technologies has accurate resolution by digital processing, they have limitations such as long processing time and large energy consumption due to the downconversion and demodulation of received signals [1-2]. In case of the only RF processing technique proposed by GEDC (Georgia Electronic Design Center) of Georgia Tech., U.S., even though the spectrum sensing is performed at an RF front-end, it conducts the dual-loop processing of the coarse sensing and the fine sensing with complicated and expensive process to be applied to low power consumed RF systems such as USN [3]. In this paper, a spectrum sensing method is proposed based on an RF front-end system for low power consumed wireless connectivity services, which can be suitable for channel selective RF receivers. The proposed sensing method can solve the problems such as low-speed, high powerconsumption with channel selectivity. By converting the received carrier frequency to a DC voltage, the proposed system can sense the channel in use. Because it has a simple architecture, low powerconsumption, and fast processing time without down-conversion and demodulation, the proposed spectrum sensing method can apply to wireless connectivity sensor network systems.