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Digital Quadrature Sampling and Processing of Bandpass Signal

(Pan Minghai), (Liu Fen), (Di Jianhong), (The College of Information Science and Engineering, Yanshan University, Qinhuangdao 066004).  
Quadrature samping and processing approach of bandpass signal is samping the bandpass signal and detecting by way of DSP. In this paper, three bandpass digital quadrature sampling are discussed, based on discrete lowpass filter, Hil-bert transform and discrete Fourier transform. The results of computer simulation illustrate that the method based on FFT achieves highest quadrature sampling accuracy.
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