Title :
Time-stretched short-time Fourier transform
Author :
Nuruzzaman, A. ; Boyraz, Ozdal ; Jalali, Bahram
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA
fDate :
4/1/2006 12:00:00 AM
Abstract :
The authors propose and demonstrate the time-stretched short-time Fourier transform (TS-STFT) technique to overcome the limitation of an analog-digital converter (ADC) in the time-frequency analysis of ultrafast signals. Experimentally, the time-frequency analysis of highly chirped RF signals, with a chirp rate as high as 350 GHz/ns, is demonstrated. An effective real-time sampling rate of 320 GSa/s is achieved. Time stretching enhances the analog bandwidth and the effective sampling rate of the ADC and enables measurement of the instantaneous behavior of highly nonstationary ultrawideband signals.
Keywords :
Fourier transforms; analogue-digital conversion; signal sampling; time-frequency analysis; RF signals; analog bandwidth; analog-digital converters; optical analog-digital conversion; optical quantization; optical sampling; optical signal processing; photonic time stretching; real-time sampling rate; time-frequency analysis; time-stretched short-time Fourier transform; ultrafast signals; ultrawideband signals; Analog-digital conversion; Bandwidth; Chirp; Fourier transforms; Optical modulation; Optical signal processing; Sampling methods; Signal analysis; Signal sampling; Ultrafast optics; Analog–digital converter (ADC); optical analog–digital conversion; optical quantization; optical sampling; optical signal processing; photonic time stretching; short-time Fourier transform (STFT); time stretch;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2006.864246
