The Signal Detection in TWACS Based on IIR Filter

Two-way Automatic Communication System (TWACS) eliminates most of harmonic and noise interference from power network by way of the time-domain difference technology. Then the modulating signal is demodulated by judging the direction of it. In order to improve the communication performance, this paper puts forward a method to reduce the electric network noise in the difference signal based on IIR band-pass filter. The variation of the cross correlation coefficient of detection signal and reference signal can reflect the improved results. The analysis and comparison of field measured signal have shown that this method is much more reliable than the traditional method.