Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (8): 2388-2394.doi: 10.13229/j.cnki.jdxbgxb.20220274

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Channelization of wideband signal based on critical sampling polyphase filter banks

Hai-long ZHANG1,2,3,4(),Meng ZHANG1,2,Ya-zhou ZHANG1,2,Jie WANG1,4,Xin-chen YE1,4,Wan-qiong WANG1,Jia LI1,Xu DU1,2,Ting ZHANG1,2   

  1. 1.Xinjiang Astronomical Observatory，Chinese Academy of Sciences，Urumqi 830011，China
    2.School of Astronomy and Space Science，University of Chinese Academy of Sciences，Beijing 100049，China
    3.Key Laboratory of Radio Astronomy，Chinese Academy of Sciences，Nanjing 210008，China
    4.National Astronomical Data Center，Beijing 100101，China
  • Received:2022-04-01 Online:2023-08-01 Published:2023-08-21

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Abstract:

In view of spectral leakage and aliasing in the wideband signal channelization in the field of communication and radio astronomy. The effects of different window functions such as Hanning windows， Hamming windows and Kaiser windows on the performance of the finite impulse response （FIR） digital filter were simulated and analyzed. Based on the Hamming window FIR digital filter designed and implemented the critical sampling polyphase filter banks， and the spectral characteristics of the critical sampling polyphase filter banks were studied. The sub-bands division of wideband signals were realized by using the astronomical observation baseband data， and the filtering performance characteristics of the critical sampling polyphase filter banks and FIR digital filter banks were analyzed. Employed the critical sampling polyphase filter banks realized the multichannel output of wideband baseband data， and the frequency spectrum of the sub-channels was analyzed and corrected， which correspond to the original signal.

Key words: astroinformatics, polyphase filter banks, fir filter, digital filter banks, channelization

CLC Number: 

  • TP301.6

Fig.1

Channelizer basic structure"

Fig.2

Narrowband， wideband and ultra-wideband signals"

Fig.3

Uniform subband decomposition"

Fig.4

Digital filter bank structure"

Fig.5

Digital filter bank structure"

Fig.6

FIR filter structure"

Fig.7

Low-pass filter with different window functions"

Fig.8

Baseband data spectrum"

Fig.9

Baseband data 4-channelization of FIR digital filter banks"

Fig.10

Baseband data 8 channelization"

Fig.11

Each channel spectrum after shift"

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