An Efficient Real-Time Digital Channelization Method Based On Frequency-Domain Windowing
Lin Wang, Kunda Wang, Rongqi Zhao, Li Lin, Chuanyu Wang, Deheng Wang · 2021
In order to reduce the influences of spectrum leakage and scalloping loss of fast Fourier transform channelizer on the performance of digital receivers, an efficient real-time digital channelization method based on frequency-domain windowing was proposed. This method utilized a special window on the basis of windowed fast Fourier transform model. Theoretical derivation revealed that the proposed method could be realized only by adding an adder to each channel calculation, which facilitated the implementation in FPGAs. Moreover, the sidelobe is reduced by 10dB and the gain of channel intersection is increased by 2dB compared with fast Fourier transform channelizer. The simulation results showed that the proposed method had improved the signal-to-noise ratio, the accuracy of amplitude calculation, and the instantaneous dynamic range of the receivers.