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Low-Complexity Filter for Software-Defined Radio by Modulated Interpolated Coefficient Decimated Filter in a Hybrid
Temidayo O Otunniyi1, Hermanus C Myburgh1
1Department of Electrical, Electronic and Computer Engineering, University of Pretoria, Pretoria 0002, South Africa.
Sensors (Basel, Switzerland)
|February 15, 2022
Summary
A novel hybrid Farrow (HFarrow) algorithm reduces computational complexity for software-defined radio channelization. This efficient Farrow filter design achieves significant multiplier reductions compared to existing methods.
Area of Science:
- Digital Signal Processing
- Software-Defined Radio
Background:
- Farrow filters are crucial for channelization in software-defined radio (SDR).
- Traditional Farrow filters exhibit performance degradation and high computational complexity in wideband applications, especially near the Nyquist region.
Purpose of the Study:
- To propose a novel hybrid Farrow (HFarrow) algorithm for low-complexity channelization in multi-standard SDR receivers.
- To design a filter with reduced computational load while maintaining channelization performance.
Main Methods:
- The proposed HFarrow algorithm integrates a modulated Farrow filter with a frequency response interpolated coefficient decimated masking filter.
- A comparative analysis was performed against non-uniform modulated discrete Fourier transform filter banks (NU MDFT FB), coefficient decimated filter banks (CD FB), and interpolated coefficient decimated (ICDM) filter algorithms.
Main Results:
- The HFarrow filter bank demonstrated significant multiplier reductions: 50% compared to NU MDFT FB, 70% compared to CD FB, and 64% compared to ICDM.
- The HFarrow filter bank provides an equivalent number of sub-band channels as the compared algorithms.
Conclusions:
- The proposed HFarrow algorithm offers a substantial reduction in computational complexity for wideband channelization in SDR.
- This novel approach enables efficient multi-standard receiver design without compromising the number of sub-band channels.
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