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Unformatted text preview: Energy Detection ECE4305: SoftwareDefined Radio Systems and Analysis Professor Alexander M. Wyglinski Department of Electrical and Computer Engineering Worcester Polytechnic Institute Lecture 20 Professor Alexander M. Wyglinski ECE4305: SoftwareDefined Radio Systems and Analysis Energy Detection Detector Framework Mathematical Formulation How Does Energy Detection Work? I Energy detection uses the energy spectra of the received signal in order to identify the frequency locations of the transmitted signal I Several steps are involved in producing the frequency representation of the intercepted signal I Prefiltering of intercepted signal extracts frequency band of interest I Analogtodigital conversion (ADC) converts filtered intercepted signal into discrete time samples I Fast Fourier transform (FFT) provides the frequency representation of the signal I Squarelaw device yields the square of the magnitude of the frequency response from the FFT output Professor Alexander M. Wyglinski ECE4305: SoftwareDefined Radio Systems and Analysis Energy Detection Detector Framework Mathematical Formulation Detector Implementation A/D (.) 2 Averages N samples PreFilter FFT Figure: Schematic of an Energy Detector Implementation Employing PreFiltering and a SquareLaw Device....
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This note was uploaded on 01/13/2011 for the course ECE 4305 taught by Professor Wy during the Spring '10 term at WPI.
 Spring '10
 Wy

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