LIU Sujuan, LIU Lei. An FFT-Based High SNR MWC Back-End Architecture with Analog Low-Pass Filter Compensation[J]. Chinese Journal of Electronics, 2020, 29(3): 563-573. doi: 10.1049/cje.2020.03.012
Citation: LIU Sujuan, LIU Lei. An FFT-Based High SNR MWC Back-End Architecture with Analog Low-Pass Filter Compensation[J]. Chinese Journal of Electronics, 2020, 29(3): 563-573. doi: 10.1049/cje.2020.03.012

An FFT-Based High SNR MWC Back-End Architecture with Analog Low-Pass Filter Compensation

doi: 10.1049/cje.2020.03.012
Funds:  This work is supported by the Scientific Research Project of Beijing Educational Committee (No.KM201810005022) and the Beijing Natural Science Foundation (No.4162014, No.4184083).
  • Received Date: 2020-02-26
  • Rev Recd Date: 2020-03-20
  • Publish Date: 2020-05-10
  • We study the impacts of non-ideal filters in Modulated wideband converter (MWC). An analog filter compensating method is presented. The limitations of the conventional back-end of the advanced MWC is analyzed and an improved back-end based on Fast Fourier transform (FFT) is proposed. By setting proper length of the digital signal processed each time, the proposed system increases the recovery Signal-to-noise ratio (SNR) and significantly reduces the computation loads. The compensating operation is accurate to each frequency point and the expanding operation is simplified to a splitting of the frequency points. Numerical simulations demonstrate our proposed system against the ideal MWC with different filters. The results indicate that the recovery SNR of over 70 decibel is achieved with almost only one-tenth the computation complexity of the conventional MWC backend.
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