Abstract/Details

Detection technique and front-end RF tunable filter for cognitive radio systems


2010 2010

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Abstract (summary)

Cognitive radio (CR) can effectively increase the spectral efficiency. However, there is an inevitable interference problem between the primary licensed users and the unlicensed CR devices. A detection technique utilizing the local oscillator (LO) leakage signal coming from a nearby mobile terminal is proposed and evaluated for short-range wireless communication systems, such as an ultra-wide band (UWB) system. Due to the low-level LO leakage, the detection sensitivity is a great concern. Local oscillator phase noise of the detector can degrade the detection sensitivity. Spectrum broadening of the LO phase noise interaction with an adjacent channel signal through a multiplier is analyzed and the degradation in detection performance is evaluated.

Spectrum broadening is applied to the cognitive radio (CR) device operation in UHF bands. A strong TV signal transmitted by a nearby TV station can interact with LO phase noise of a CR receiver, and induce serious in-band interference which possible degrades the receiver performance. In order to suppress strong TV signals, a wide dynamic range low-power CMOS-based RF tunable filter with image cancellation is presented using a balanced passive complex mixer and frequency dependent loads. The tunable RF notch filter with 17 dB attenuation and 1.6 dB insertion loss is achieved using parallel LC tank loads. A tunable RF bandpass filter is implemented with capacitive termination, and achieves 18 dB maximum attenuation and 1.8 dB insertion loss.

Indexing (details)


Subject
Electrical engineering
Classification
0544: Electrical engineering
Identifier / keyword
Applied sciences; Cognitive radio; Local oscillators; Phase noise; RF tunable filters; Ultrawideband
Title
Detection technique and front-end RF tunable filter for cognitive radio systems
Author
Park, Sanghoon
Number of pages
130
Publication year
2010
Degree date
2010
School code
0033
Source
DAI-B 71/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781109560275
Advisor
Larson, Lawrence E.; Milstein, Laurence B.
Committee member
Buckwalter, James F.; Hodgkiss, William S.; Trogler, William C.
University/institution
University of California, San Diego
Department
Electrical Engineering (Electronic Circuits and Systems)
University location
United States -- California
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3389416
ProQuest document ID
305187666
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305187666
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