Return to search

RF Sensing and Receiving Circuits for a Cognitive Radio

In this thesis, various kinds of theory to account for injection locking and pulling in the literature are studied and compared. On this basis, this thesis derives a generalized locking equation when injection signal is modulated signal. In applications, a novel RF sensing circuit for cognitive radio system is proposed using injection locking and frequency demodulation. Detailed circuit architecture and sensing principle are also described in the thesis. In implementation, a hybrid VCO and a CMOS VCO have been separately used with the other components to establish the RF sensing circuit. The simulation relies on a discrete-time numerical method. Comparison between measurement and simulation shows very good agreement. This RF sensing circuit can simultaneously sense frequency and power with a sensing speed up to 400 MHz/ms and a sensing sensitivity as low as -80 dBm, showing that the presented prototype can fast and reliably sense frequency and power for analog and digital modulation signals.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0726109-161606
Date26 July 2009
CreatorsWang, Fu-Kang
ContributorsKang-Chun Peng, Huey-Ru Chuang, Chie-In Lee, Sheng-Fu Chang, Tzyy-Sheng Horng
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0726109-161606
Rightsnot_available, Copyright information available at source archive

Page generated in 0.0019 seconds