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Interference-aware frequency-agile onboard processor using fine-grained multilevel analysis-synthesis filter-bank

Surajit Sarkar1,2, Amitabha Das3, Deepak Mishra4

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Summary
This summary is machine-generated.

This study introduces a spectrally optimized filter bank for satellite and deep-space digital signal processing. It significantly reduces hardware and computational needs for fine-grained channelization.

Keywords:
Analysis–synthesis filter bankFPGA-oriented implementation.Multichannel filter banksMultilevel channelizationMultirate signal processingUniform filter bank

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Area of Science:

  • Digital Signal Processing
  • Filter Bank Design
  • Aerospace Communications

Background:

  • Efficient digital signal processing is crucial for deep-space and satellite missions.
  • Existing channelization methods often incur high computational and memory overhead.
  • Need for spectrally optimized solutions with reduced hardware complexity.

Purpose of the Study:

  • To propose a spectrally optimized, multichannel filter bank channelizer.
  • To achieve fine-grained channelization with reduced memory and computational overhead.
  • To demonstrate feasibility for satellite-onboard and deep-space digital signal processing.

Main Methods:

  • Developed a unified framework for digital signal processing.
  • Utilized a single prototype filter for analysis and synthesis subband filters via dyadic dilation and structured cascading.
  • Employed a multi-objective cost-function to optimize the prototype filter under Quadrature Phase-Shift Keying (QPSK) recovery constraints.
  • Performed block-based Fast Fourier Transform (FFT) complexity analysis.

Main Results:

  • Achieved strong channel isolation (>98 dB average, 79.6 dB worst-case for 64 channels).
  • Maintained Quadrature Phase-Shift Keying (QPSK) error vector magnitude (EVM) below 10%.
  • Demonstrated communication-relevant isolation (>60 dB worst-case) under finite word-length constraints via fixed-point simulations and FPGA synthesis.

Conclusions:

  • The proposed filter bank channelizer offers spectrally optimized performance with reduced overhead.
  • It is well-suited for onboard digital processors in next-generation satellite and deep-space missions.
  • The architecture exhibits realistic hardware feasibility under practical constraints.