Patent ID: 7627287
Filing Date: 2009-12-01
Classification: H04B,H04L

Abstract:
1. An on-channel repeater, comprising: a receiving antenna for receiving a first RF input signal on a first channel; a transmitting antenna for transmitting an RF signal having a frequency which is the same as a frequency of said first RF input signal; an amplification path between said receiving and transmitting antennas, said amplification path providing substantially linear processing, said amplification path including a decorrelating delay circuit having an input port and an output port; a reference signal input for receiving a reference signal; a filter estimator having a first input coupled to said reference signal input and having a second input coupled to the input port of said decorrelating delay circuit, and having an output, said filter estimator for producing a plurality of control coefficients; an adaptive filter having a first input coupled to said reference signal input, having a second input coupled to the output of said filter estimator and having an output coupled to the input port of said decorrelating delay circuit, said adaptive filter controlled by said control coefficients to provide a modified signal at the adaptive filter output; a combiner for combining said modified signal with the first RF input signal in said amplification path and providing the combined signal to said decorrelating delay circuit; and an RF amplifier disposed in said amplification path, said RF amplifier having an input coupled to the output of said decorrelating delay circuit and having an output coupled to said transmitting antenna, wherein said RF amplifier is disposed to receive said combined signal and to provide said combined signal to said transmitting antenna; and wherein said reference signal input for receiving said reference signal is coupled to said transmitting antenna after said RF amplifier such that said reference signal input is configured to provide to said filter estimator and said adaptive filter, a reference signal which includes intermodulation products generated by said RF amplifier and wherein in response to the combined signal provided thereto, said decorrelating delay circuit mitigates an effect of the intermodulation products generated by said RF amplifier.