Stability recovery for an on-frequency RF repeater with adaptive echo cancellation

A method for recovering stability of a repeater in a wireless communication system, comprising:

• providing a list having a plurality of list elements employing an adaptive algorithm employing measured echo cancellation, each list element comprising one or more echo cancellation parameters and one or more associated analog repeater settings;
• detecting a current analog repeater setting;
• comparing the current detected repeater setting to those in the list;
• and
• selecting an echo cancellation parameter associated with the most similar repeater setting in the list.

A method for stabilizing a wireless repeater, comprising:

• obtaining an autocorrelation of a signal in a signal path of the repeater;
• detecting an echo in the signal path based on the autocorrelation;
• providing a list of elements indicating past successful echo cancellation coefficients and associated past measured analog repeater settings;
• and
• adaptively employing the echo cancellation coefficients to cancel the echo in the signal path employing measured echo cancellation.

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 and for stabilizing the on-frequency repeater employing measured echo cancellation,
• wherein the internal feedback path comprises:
• means for providing a list having a plurality of list elements, each list element comprising one or more echo cancellation parameters, and one or more associated measured analog repeater settings;
• means for monitoring a signal autocorrelation in the feedback path;
• and
• means for adaptively cancelling the echo based on the autocorrelation signal and the list.