Mobile telecommunication repeater for canceling feedback signals
First Claim
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1. A mobile telecommunication wireless repeater comprising:
- a combination stage for combining a received signal with a feedback cancellation signal;
an adjustable delay for variably delaying an output signal of the combination stage;
a comparison stage for comparing an input signal corresponding to the received signal that is input to the combination stage with the delayed output signal of the combination stage that is delayed by the adjustable delay, and determining and outputting respective weighted values and time offset values for a plurality of feedback signals to be cancelled based on the comparison, wherein first and second ones of the feedback signals are separated by a long time delay interval; and
a recombination stage configured to directly receive the output signal of the combination stage prior to the output signal being delayed by the adjustable delay, and to generate the feedback cancellation signal from the output signal of the combination stage based on the output from the comparison stage, the recombination stage comprising a plurality of paths arranged in parallel, wherein each of the paths comprises a delay function and a corresponding adaptive filter, and wherein each of the delay functions is directly connected to a common first node and each of the adaptive filters is directly connected to a common second node for combining respective output signals of the adaptive filters;
wherein the adaptive filters are configured to receive respective ones of the weighted values and the delay functions are configured to receive respective ones of the time offset values from the comparison stage corresponding to respective ones of the feedback signals, wherein a weight of a filter coefficient of the adaptive filter for each path and the time offset value associated with each path are both independently adjustable based at least on the output from the comparison stage, and wherein the recombination stage is configured to generate the feedback cancellation signal according to the combined output signals from the adaptive filters that correspond to the weighted values and the time offset values for the plurality of the feedback signals.
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Abstract
A mobile telecommunication wireless repeater includes: a combination stage for combining a received signal with a feedback cancellation signal; a comparison stage for comparing an input signal of the combination stage with an output signal of the combination stage and determining a weighted value and a time offset value for a feedback signal to be cancelled, based on the comparison; and a recombination stage comprising one or more adaptive filters and configured to receive the weighted value and the time offset value and generate the feedback cancellation signal according to the weighted value and the time offset value.
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Citations
15 Claims
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1. A mobile telecommunication wireless repeater comprising:
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a combination stage for combining a received signal with a feedback cancellation signal; an adjustable delay for variably delaying an output signal of the combination stage; a comparison stage for comparing an input signal corresponding to the received signal that is input to the combination stage with the delayed output signal of the combination stage that is delayed by the adjustable delay, and determining and outputting respective weighted values and time offset values for a plurality of feedback signals to be cancelled based on the comparison, wherein first and second ones of the feedback signals are separated by a long time delay interval; and a recombination stage configured to directly receive the output signal of the combination stage prior to the output signal being delayed by the adjustable delay, and to generate the feedback cancellation signal from the output signal of the combination stage based on the output from the comparison stage, the recombination stage comprising a plurality of paths arranged in parallel, wherein each of the paths comprises a delay function and a corresponding adaptive filter, and wherein each of the delay functions is directly connected to a common first node and each of the adaptive filters is directly connected to a common second node for combining respective output signals of the adaptive filters; wherein the adaptive filters are configured to receive respective ones of the weighted values and the delay functions are configured to receive respective ones of the time offset values from the comparison stage corresponding to respective ones of the feedback signals, wherein a weight of a filter coefficient of the adaptive filter for each path and the time offset value associated with each path are both independently adjustable based at least on the output from the comparison stage, and wherein the recombination stage is configured to generate the feedback cancellation signal according to the combined output signals from the adaptive filters that correspond to the weighted values and the time offset values for the plurality of the feedback signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of cancelling feedback from a received signal, the method comprising:
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combining the received signal with a current feedback cancellation signal; delaying an output signal after the combination; comparing an input signal corresponding to the received signal before the combination with the delayed output signal after the combination; determining and outputting respective weighted values and time offset values for a plurality of feedback signals to be cancelled based on the comparison, wherein first and second ones of the feedback signals are separated by a long time delay interval; and utilizing a recombination stage to directly receive the output signal after the combination and prior to the output signal being delayed, and to generate a further feedback cancellation signal from the output signal after the combination based on the outputted respective weighted values and time offset values, the recombination stage comprising a plurality of paths arranged in parallel, wherein each of the paths comprises a delay function and a corresponding adaptive filter, wherein each of the delay functions is directly connected to a common first node and each of the adaptive filters is directly connected to a common second node for combining respective output signals of the adaptive filters, wherein the adaptive filters are configured to receive respective ones of the outputted weighted values and the delay functions are configured to receive respective ones of the outputted time offset values corresponding to respective ones of the feedback signals, and wherein a weight of a filter coefficient of the adaptive filter for each path and the time offset value associated with each path are both independently adjustable, to generate a further feedback cancellation signal based on the combined output signals from the adaptive filters that correspond to the weighted values and the time offset values for the plurality of the feedback signals; and applying the further feedback cancellation signal in place of the current feedback cancellation signal. - View Dependent Claims (11, 12, 13, 14)
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15. A method of cancelling feedback from a received signal, the method comprising:
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combining the received signal with a feedback cancellation signal; delaying an output signal after the combination; comparing an input signal corresponding to the received signal before the combination with the delayed output signal after the combination; determining and outputting a weighted value and a time offset value for each feedback signal of a plurality of feedback signals to be cancelled based on the comparison, wherein first and second ones of the feedback signals are separated by a long time delay interval; and utilizing a recombination stage to directly receive the output signal after the combination and prior to the output signal being delayed, and to adjust the feedback cancellation signal from the output signal after the combination based on the outputted respective weighted values and time offset values, the recombination stage comprising a plurality of paths arranged in parallel, wherein each of the paths comprises a delay function and a corresponding adaptive filter, and wherein each of the delay functions is directly connected to a common first node and each of the adaptive filters is directly connected to a common second node for combining respective output signals of the adaptive filters; wherein the adaptive filters are configured to receive respective ones of the outputted weighted values and the delay functions are configured to receive respective ones of the outputted time offset values corresponding to respective ones of the feedback signals, and wherein a weight of a filter coefficient of the adaptive filter for each path and the time offset value associated with each path are both independently adjustable, to adjust the feedback cancellation signal based on the combined output signals from the adaptive filters that correspond to the weighted values and the time offset values for the plurality of the feedback signals.
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Specification