Patent ID: 8385818
Filing Date: 2013-02-26
Classification: H04B,H04L

Abstract:
1. A wireless repeater including a first antenna and a second antenna to receive an input signal and transmit an amplified signal, the input signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first antenna and the second antenna, the repeater comprising: an echo canceller to receive the input signal and configured to generate an echo cancelled signal by estimating a feedback channel between the first antenna and the second antenna and further configured to cancel a feedback signal estimate from the input signal; an amplifier to amplify the echo cancelled signal and to provide the amplified signal to the first antenna or the second antenna to be transmitted; and a variable delay element configured to receive the echo cancelled signal and to introduce a first delay to the echo cancelled signal, the first delay being selected to reduce delay spread in the estimation of the feedback channel, wherein the delayed echo cancelled signal output by the variable delay element is coupled to the echo canceller as a reference signal for estimating the feedback channel.