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SDFnT-Based Parameter Estimation for OFDM Radar Systems with Intercarrier Interference.

Jingqi Wang1, Pingping Wang1, Ruoyu Zhang1

  • 1School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Sensors (Basel, Switzerland)
|January 8, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for Orthogonal Frequency Division Multiplexing (OFDM) radar to accurately estimate range and velocity, even in high-mobility situations. The novel approach effectively eliminates interference, improving performance for radar systems.

Keywords:
intercarrier interference (ICI)orthogonal frequency division multiplexing (OFDM)radarscale discrete Fresnel transform (SDFnT)

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing
  • Electromagnetics

Background:

  • Orthogonal Frequency Division Multiplexing (OFDM) radar faces significant challenges in range-velocity estimation, particularly in high-mobility scenarios.
  • Interference between subcarriers (ICI) degrades the performance of traditional OFDM radar systems.

Purpose of the Study:

  • To propose a novel Intercarrier Interference (ICI)-free parameter estimation method for OFDM radar systems.
  • To enhance the accuracy and robustness of range-velocity estimation in high-mobility and low Signal-to-Noise Ratio (SNR) conditions.

Main Methods:

  • A Scale Discrete Fresnel Transform (SDFnT) is employed to convert OFDM radar signals into the scale Fresnel domain.
  • The SDFnT recovers subcarrier orthogonality using an optimal scale factor.
  • The method leverages the compatibility of SDFnT with the Discrete Fourier Transform (DFT) for efficient computation.

Main Results:

  • The proposed SDFnT-based scheme effectively eliminates ICI for both single and multiple targets.
  • High-accuracy delay-Doppler estimation is achieved in high-velocity and low-SNR environments.
  • The method demonstrates consistency and robustness in challenging radar operating conditions.

Conclusions:

  • The novel SDFnT-based method offers a significant improvement for OFDM radar performance in high-mobility scenarios.
  • This approach provides a feasible and computationally efficient solution for practical OFDM radar implementation.
  • The technique successfully addresses the limitations of existing methods, enhancing estimation accuracy and reliability.