Processing Methods After Frequency Channelization

Processing Methods After Frequency Channelization

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This chapter describes how, after the frequency channelization, further processing is performed to determine the number of frequencies and the frequencies themselves. The frequency data resolution (or frequency bin width) calculated through an FFT operation determines the frequency precision measured on the input signal. It is often desirable to obtain better frequency precision than the FFT operation can provide. Another problem with such a wide frequency bin is that when two signals fall into one frequency output channel, the receiver cannot effectively separate them.The traditional way to separate signals by frequency is through an analog filter bank. Although the main emphasis of this book is digital, one still can consider the analog filtering approach. In an analog channelized receiver, after the filter bank and amplifier, crystal video detectors are used to convert the radio frequency (RF) into video signals. The video signals are digitized by ADCs and are further processed to determine the number of signals and their frequencies. In converting RF into video signal, some information is lost. If two signals fall into one channel, it is difficult to separate them.

Chapter Contents:

  • 13.1 Introduction
  • 13.2 Basic Considerations of Channelized Approach
  • 13.3 Filter Shape Selection
  • 13.4 Analog Filters Followed by Phase Comparators
  • 13.5 Monobit Receiver Followed by Phase Comparators
  • 13.6 Digital Filters Followed by Phase Comparators
  • 13.7 Analog Filters Followed by Monobit Receivers
  • 13.8 Considerations of Digital Filters Followed by Monobit Receivers
  • 13.9 Increase the Output Sampling Rate by Two
  • 13.10 Digital Filters Followed by Monobit Receivers
  • 13.11 Digital Filter Bank Followed by Monobit Receivers and Phase Comparators
  • 13.12 Digital Filter Bank Followed by Another FFT
  • References

Inspec keywords: channel bank filters; amplifiers; wireless channels; radio receivers; radiofrequency filters; analogue-digital conversion; source separation; fast Fourier transforms

Other keywords: radio frequency signal; amplifier; analog channelized receiver; analog filtering approach; FFT; frequency channelization; analog filter bank; frequency data resolution; frequency bin; crystal video detector; signal separation; ADC; video signal digitisation

Subjects: Integral transforms; Filtering methods in signal processing; Radio links and equipment; Amplifiers; Signal processing theory

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