System and method for linear distortion estimation by way of equalizer coefficients
First Claim
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1. A method for estimating channel distortion in a communications system channel including an adaptive equalizer, comprising:
- determining one or more adaptive filter coefficients associated with a signal by the adaptive equalizer;
normalizing the determined one or more adaptive filter coefficients to unity power;
differencing the normalized one or more adaptive filter coefficients with an all-pass filter, the differencing including a difference between an equalizer main tap coefficient and unity; and
estimating the channel distortion based upon the differencing of the normalized one or more adaptive filter coefficients including the equalizer main tap coefficient.
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Abstract
Provided is a method and system for estimating distortion in a communications channel including an adaptive equalizer. The method includes determining one or more adaptive filter coefficients associated with a signal passed through the equalizer. The method also includes estimating un-equalized channel distortion based upon the determined adaptive filter coefficients.
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Citations
27 Claims
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1. A method for estimating channel distortion in a communications system channel including an adaptive equalizer, comprising:
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determining one or more adaptive filter coefficients associated with a signal by the adaptive equalizer; normalizing the determined one or more adaptive filter coefficients to unity power; differencing the normalized one or more adaptive filter coefficients with an all-pass filter, the differencing including a difference between an equalizer main tap coefficient and unity; and estimating the channel distortion based upon the differencing of the normalized one or more adaptive filter coefficients including the equalizer main tap coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for estimating noise in a communications channel including an adaptive equalizer, comprising:
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determining one or more adaptive filter coefficients h1(n) associated with a signal by the adaptive equalizer; normalizing the determined one or more adaptive filter coefficients to unit energy; and differencing the normalized one or more adaptive filter coefficients with an ideal response h0(n) of the communications channel, the differencing producing an error sequence h2(n). - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for estimating noise in a communications channel including an adaptive equalizer, comprising:
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receiving data within the communications channel and converging taps of the adaptive equalizer when the data is received; determining a sum of tap power values, the sum including a power of a main tap and dividing the sum by a combined power of all the taps; normalizing the taps to unity power; determining a difference filter from the normalized taps; and summing a power of taps of the difference filter.
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17. An apparatus for estimating channel distortion in a communications system channel including an adaptive equalizer, comprising:
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means for determining one or more adaptive filter coefficients associated with a signal by the adaptive equalizer; means for normalizing the determined one or more adaptive filter coefficients to unity power; means for differencing the normalized one or more adaptive filter coefficients with an all-pass filter, the differencing including a difference between an equalizer main tap coefficient and unity; and means for estimating the channel distortion based upon the differencing of the normalized one or more adaptive filter coefficients including the equalizer main tap coefficient. - View Dependent Claims (18, 19, 20, 21)
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22. An apparatus for estimating noise in a communications channel including an adaptive equalizer, comprising:
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means for determining one or more adaptive filter coefficients h1(n) associated with a signal by the adaptive equalizer; means for normalizing the determined one or more adaptive filter coefficients to unit energy; and means for differencing the normalized one or more adaptive filter coefficients with an ideal response h0(n) of the communications channel, the differencing producing an error sequence h2(n). - View Dependent Claims (23, 24, 25, 26)
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27. A computer readable medium carrying one or more sequences of one or more instructions for execution by one or more processors to perform a method for estimating channel distortion in a communications system channel including an adaptive equalizer, the instructions when executed by the one or more processors, cause the one or more processors to perform the steps of:
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determining one or more adaptive filter coefficients associated with a signal by the adaptive equalizer; normalizing the determined one or more adaptive filter coefficients to unity power; differencing the normalized one or more adaptive filter coefficients with an all-pass filter, the differencing including a difference between a normalized equalizer main tap coefficient and unity; and estimating un-equalized channel distortion based upon the differencing of the normalized one or more adaptive filter coefficients including the equalizer main tap coefficient.
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Specification