Problem
Research questions and friction points this paper is trying to address.
Frequency Estimation
SNR
Multi-tone Sinusoidal Signals
Robustness
Precision
Frequency Estimation Based on SNR-adaptive Frequency Estimator Under Wide SNR Range
🤖 AI Summary
本文提出了一种基于信噪比自适应的频率估计器SAFE，通过TFINet增强弱频成分并利用SFS选择合适的频率估计方法，以解决在宽信噪比范围内准确估计多音信号频率的问题。
📝 Abstract
Frequency estimation is the problem of estimating individual tone frequencies from noisy multi-tone sinusoidal signals. Existing frequency estimation methods have difficulty accurately estimating both the number of tone frequencies and the individual tone frequencies in low signal-to-noise ratio (SNR) environments, because weak tone frequency components are buried in noise. In addition, existing methods generally exhibit a trade-off between robustness at low SNR and frequency estimation precision at high SNR, making it difficult to achieve consistently superior frequency estimation performance over a wide SNR range. To overcome these limitations, this paper proposes an SNR-adaptive frequency estimator (SAFE). SAFE consists of a time-frequency image neural network (TFINet), which enhances weak tone frequency components at low SNR, and an SNR-based frequency selector (SFS), which selects an appropriate frequency estimator according to the SNR of the estimated tone frequencies. TFINet enhances tone frequency components even in the low-SNR range, while SFS estimates the SNR of each tone frequency and selects either a robust frequency estimator or a super-resolution frequency estimator according to the estimated SNR. This enables SAFE to achieve robustness at low SNR while preserving high precision at high SNR. Simulation results show that SAFE achieves an False Negative Rate (FNR) of 13.00% over the SNR range from -10 dB to 0 dB, corresponding to an 13.04% improvement over the state-of-the-art method. In addition, SAFE reduces the Nearest Neighbor-Root Mean Squared Error (NN-RMSE) by 56.67% compared with the state-of-the-art method, demonstrating that SAFE performs more accurate frequency estimation. Furthermore, experiments using real-world data demonstrate that SAFE provides robust frequency estimation performance even in practical environments with clutter.
Innovation
Methods, ideas, or system contributions that make the work stand out.
SNR-adaptive frequency estimator
time-frequency image neural network
signal-to-noise ratio
frequency estimation
🔎 Similar Papers
No similar papers found.
