FEEDBACK DELAY CONTROL IN AN ECHO CANCELLATION REPEATER
First Claim
Patent Images
1. A wireless repeater having 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:
- receive circuitry configured to receive the input signal from one of the first antenna and the second antenna and to generate a delayed echo cancelled signal using the input signal, the receive circuitry comprising;
an echo canceller configured to access a feedback signal estimate, and to cancel the feedback signal estimate from the input signal;
a variable delay element to introduce a first delay before or after the echo canceller; and
an amplifier to amplify the delayed echo cancelled signal to generate an amplified signal to be transmitted.
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Abstract
A wireless repeater includes an echo canceller to cancel an estimated feedback amount from an input signal and a delay to delay the input signal. The delay may be selected to decorrelate a remote signal from a signal to be transmitted by the repeater.
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Citations
23 Claims
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1. A wireless repeater having 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:
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receive circuitry configured to receive the input signal from one of the first antenna and the second antenna and to generate a delayed echo cancelled signal using the input signal, the receive circuitry comprising; an echo canceller configured to access a feedback signal estimate, and to cancel the feedback signal estimate from the input signal; a variable delay element to introduce a first delay before or after the echo canceller; and an amplifier to amplify the delayed echo cancelled signal to generate an amplified signal to be transmitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless repeater having 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:
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means for receiving the input signal from one of the first and the second antenna and for generating a delayed echo cancelled signal using the input signal, where the means for receiving comprises; means for cancelling a feedback signal estimate from the input signal; means for introducing a first delay before or after the feedback signal is cancelled from the input signal; and means for amplifying the delayed echo cancelled signal.
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13. A method for providing echo cancellation in a wireless repeater in a wireless communication system, comprising:
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receiving an input signal at a first antenna of the repeater, 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 a second antenna; cancelling a feedback signal estimate from the input signal; introducing a first delay to the signal before or after cancelling the feedback signal estimate, wherein a delayed echo cancelled signal is generated based on the cancelling the feedback signal estimate from the input signal and the introducing the first delay; amplifying the delayed echo cancelled signal; and transmitting the amplified signal on the second antenna. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification