Autoregressive signal processing for repeater echo cancellation
First Claim
1. A method of mitigating multipath coupling interference in a communication system comprising:
- measuring an error signal in a signal path of the communication system, wherein the error signal contains desired communication signals, noise signals, and multipath coupling interference signals;
computing a power spectrum of the measured error signal;
estimating a response of the multipath coupling interference by processing the power spectrum of the measured error signal using autoregressive estimation in a frequency domain that is performed using linear prediction in the frequency domain by minimizing, at a discrete set of frequencies, a prediction error power associated with the measured error signal;
computing a plurality of FIR filter coefficients from the estimated response;
applying the plurality of filter coefficients to an adjustable filter that generates a cancellation signal used to at least partially mitigate the multipath coupling interference signals.
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Abstract
A method and apparatus to address multipath interference in a communication system is provided. The method comprises measuring an error signal in a signal path of the repeater, wherein the error signal contains desired communication signals, noise signals, and multipath coupling interference signals, computing a power spectrum of the measured error signal, and estimating a response of the multipath coupling interference by processing the power spectrum of the measured error signal using autoregressive estimation in the frequency domain. The method further comprises computing a plurality of FIR filter coefficients from the estimated response and applying the plurality of filter coefficients to an adjustable filter that generates a cancellation signal used to at least partially mitigate the multipath coupling interference signals.
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Citations
26 Claims
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1. A method of mitigating multipath coupling interference in a communication system comprising:
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measuring an error signal in a signal path of the communication system, wherein the error signal contains desired communication signals, noise signals, and multipath coupling interference signals; computing a power spectrum of the measured error signal; estimating a response of the multipath coupling interference by processing the power spectrum of the measured error signal using autoregressive estimation in a frequency domain that is performed using linear prediction in the frequency domain by minimizing, at a discrete set of frequencies, a prediction error power associated with the measured error signal; computing a plurality of FIR filter coefficients from the estimated response; applying the plurality of filter coefficients to an adjustable filter that generates a cancellation signal used to at least partially mitigate the multipath coupling interference signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus, comprising:
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an adjustable filter; and processing circuitry coupled to the adjustable filter, the processing circuitry configured to; measure an error signal in a signal path of the apparatus, wherein the error signal contains desired communication signals, noise signals, and multipath coupling interference signals; compute a power spectrum of the measured error signal; estimate a response of the multipath coupling interference by processing the power spectrum of the measured error signal using autoregressive estimation in a frequency domain that is performed using linear prediction in the frequency domain by minimizing, at a discrete set of frequencies, a prediction error power associated with the measured error signal; compute a plurality of FIR filter coefficients from the estimated response; and apply the plurality of filter coefficients to the adjustable filter to generate a cancellation signal used to at least partially mitigate the multipath coupling interference signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification