Adaptive Notch Filter for Eliminating Power Frequency Interference in Communication Systems

Utilizing adaptive notch filters to eliminate power frequency interference in communication systems. The analysis focuses on key parameters including the step size factor in LMS algorithm, frequency difference between signal and interference, amplitude and phase of reference input for single-frequency notch filtering. Using dual-frequency interference as an example, the characteristics of cascaded multi-frequency notch filters are discussed, demonstrating successful signal recovery and stable error convergence after two-stage filtering. Implementation considerations include optimal parameter selection and filter cascade design for real-time signal processing.