Adaptive echo cancellation for an on-frequency RF repeater using a weighted power spectrum

A method for echo cancellation in a wireless repeater, comprising:

• measuring a signal in a signal path of the wireless repeater;
• applying a spectral weighting function to a power spectrum of the measured signal to obtain a weighted power spectrum;
• obtaining an autocorrelation of the signal in the signal path of the repeater based on the weighted power spectrum;
• detecting an echo in the signal path based on the autocorrelation;
• and
• adaptively cancelling the echo in the signal path based on the detected echo,
• wherein the weighted power spectrum reduces the width of the autocorrelation.

A wireless communication system, comprising:

• a base station;
• and
• an on-frequency repeater for extending the base station coverage, wherein the on-frequency repeater comprises:
• an input antenna for receiving an input signal;
• an output antenna for outputting an amplified signal;
• an amplifier for amplifying the received input signal and providing the amplified output signal to the output antenna;
• and
• an internal feedback path for adaptively cancelling an echo between the input antenna and the output antenna,
• wherein the internal feedback path comprises:
• means for measuring a signal in the feedback path;
• means for obtaining a weighted power spectrum of the measured signal;
• means for obtaining a signal autocorrelation in the feedback path based on the weighted power spectrum;
• and
• means for adaptively cancelling the echo based on the obtained signal autocorrelation.