Method and system for providing a time equalizer for multiline transmission in communication systems
First Claim
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1. A method, comprising:
- mitigating spectral leakage in DMT (Discrete Multi-Tone) receivers, wherein mitigating spectral leakage comprises designing a receiver window to reduce edge effects of an IFFT/FFT transformation;
applying the receiver window to a received signal in a time domain;
using a FFT to convert the received signal into a frequency-domain symbol;
reducing the length of the receiver window by not including 0 as a first coefficient or 1 as a last coefficient in receiver window coefficients;
multiplying samples in a last part of a prefix of the received signal by the receiver window coefficients to generate a first result;
multiplying the samples in the last part by the receiver window coefficients subtracted from 1 to generate a second result;
adding the first result and second result to generate modified samples; and
substituting the modified samples into the last part of the received signal.
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Abstract
A method and system for multiline transmission in communications systems are described. Eigenvalues are calculated to maximize equalized channel impulse response (1010). Eigenvectors associated with dominant eigenvalues are identified (1020). The eigenvectors are combined into a subspace. Optimization is performed over the subspace to calculate subspace time equalizer coefficients (1030).
21 Citations
56 Claims
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1. A method, comprising:
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mitigating spectral leakage in DMT (Discrete Multi-Tone) receivers, wherein mitigating spectral leakage comprises designing a receiver window to reduce edge effects of an IFFT/FFT transformation; applying the receiver window to a received signal in a time domain; using a FFT to convert the received signal into a frequency-domain symbol; reducing the length of the receiver window by not including 0 as a first coefficient or 1 as a last coefficient in receiver window coefficients; multiplying samples in a last part of a prefix of the received signal by the receiver window coefficients to generate a first result; multiplying the samples in the last part by the receiver window coefficients subtracted from 1 to generate a second result; adding the first result and second result to generate modified samples; and substituting the modified samples into the last part of the received signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method, comprising mitigating spectral leakage in DMT (Discrete Multi-Tone) receivers, wherein mitigating spectral leakage comprises designing a receiver window to reduce edge effects of an IFFT/FFT transformation;
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using the receiver window in a multiline communications system having multiple twisted copper pairs as a single multiline communications channel, and physical-layer signals coordinated across multiple transmitters and/or across multiple receivers; applying the receiver window to a received signal in a time domain; using a FFT to convert the received signal into a frequency-domain symbol; multiplying samples in a last part of a prefix of the received signal by the receiver window coefficients to generate a first result; multiplying the samples in the last part by the receiver window coefficients subtracted from 1 to generate a second result; adding the first result and second result to generate modified samples; and substituting the modified samples into the last part of the received signal. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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mitigating crosstalk between multiple lines of a multiline communications system, comprising using a Zipper scheme, including a prefix and suffix, to synchronize transmitters and receivers across the multiple lines of the multiline communications system, wherein the multiline communications system has multiple twisted copper pairs as a single multiline communications channel, and physical layer signals coordinated across multiple transmitters and/or across multiple receivers; using a transmission scheme with non-overlapped upstream and downstream spectra; and mitigating self-echo to each receiver of the two or more receivers using the Zipper scheme, wherein the self-echo is caused by a transmitter corresponding to each receiver of the two or more receivers due to spectral leakage from an upstream frequency band into a downstream frequency band and vice versa. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system, comprising:
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means for mitigating spectral leakage in DMT (Discrete Multi-Tone) receivers, wherein mitigating spectral leakage comprises means for designing a receiver window to reduce edge effects of an IFFT/FFT transformation; means for applying the receiver window to a received signal in a time domain; means for using a FFT to convert the received signal into a frequency-domain symbol; means for reducing the length of the receiver window by not including 0 as a first coefficient or 1 as a last coefficient in receiver window coefficients; means for multiplying samples in a last part of a prefix of the received signal by the receiver window coefficients to generate a first result; means for multiplying the samples in the last part by the receiver window coefficients subtracted from 1 to generate a second result; means for adding the first result and second result to generate modified samples; and means for substituting the modified samples into the last part of the received signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A system, comprising:
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means for mitigating spectral leakage in DMT (Discrete Multi-Tone) receivers, wherein mitigating spectral leakage comprises means for designing a receiver window to reduce edge effects of an IFFT/FFT transformation; means for using the receiver window in a multiline communications system having multiple twisted copper pairs as a single multiline communications channel, and physical-layer signals coordinated across multiple transmitters and/or across multiple receivers; means for applying the receiver window to a received signal in a time domain; means for using a FFT to convert the received signal into a frequency-domain symbol; means for multiplying samples in a last part of a prefix of the received signal by the receiver window coefficients to generate a first result; means for multiplying the samples in the last part by the receiver window coefficients subtracted from 1 to generate a second result; means for adding the first result and second result to generate modified samples; and means for substituting the modified samples into the last part of the received signal. - View Dependent Claims (28, 29, 30)
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31. A system, comprising:
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means for mitigating crosstalk between multiple lines of a multiline communications system, comprising means for using a Zipper scheme, including a prefix and suffix, to synchronize transmitters and receivers across the multiple lines of the multiline communications system, wherein the multiline communications system has multiple twisted copper pairs as a single multiline communications channel, and physical-layer signals coordinated across multiple transmitters and/or across multiple receivers; means for using a transmission scheme with non-overlapped upstream and downstream spectra; and means for mitigating self-echo to each receiver of the two or more receivers using the Zipper scheme, wherein the self-echo is caused by a transmitter corresponding to each receiver of the two or more receivers due to spectral leakage from an upstream frequency band into a downstream frequency band and vice versa. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A computer readable medium, having stored thereon:
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computer-readable instructions, which when executed in a computer system, cause the computer system to mitigate spectral leakage in DMT (Discrete Multi-Tone) receivers by using a receiver window to reduce edge effects of an IFFT/FFT transformation; computer-readable instructions, which when executed in the computer system, cause the computer system to; apply the receiver window to a received signal in a time domain; and use a FFT to convert the received signal into a frequency-domain symbol; computer-readable instructions, which when executed in the computer system, cause the computer system to reduce the length of the receiver window by not including 0 as a first coefficient or 1 as a last coefficient in receiver window coefficients; and computer-readable instructions, which when executed in the computer system, cause the computer system to; multiply samples in a last part of a prefix of the received signal by the receiver window coefficients to generate a first result; add the first result and second result to generate modified samples; and substitute the modified samples into the last part of the received signal. - View Dependent Claims (38, 39, 40, 41)
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42. A computer readable medium, having stored thereon:
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computer-readable instructions, which when executed in a computer system, cause the computer system to mitigate spectral leakage in DMT (Discrete Multi-Tone) receivers by using a receiver window to reduce edge effects of an IFFT/FFT transformation; computer-readable instructions, which when executed in the computer system, cause the computer system to use the receiver window in a multiline communications system having multiple twisted copper pairs as a single multiline communications channel, and physical-layer signals coordinated across multiple transmitters and/or across multiple receivers. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50)
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51. A computer readable medium, having stored thereon:
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computer-readable instructions, which when executed in a computer system, cause the computer system to; mitigate crosstalk between multiple lines of a multiline communications system by using a Zipper scheme, including a prefix and suffix, to synchronize transmitters and receivers across the multiple lines of the multiline communications system, wherein the multiline communications system has multiple twisted copper pairs as a single multiline communications channel, and physical-layer signals coordinated across multiple transmitters and/or across multiple receivers; and computer-readable instructions, which when executed in the computer system, cause the computer system to; use a transmission scheme with non-overlapped upstream and downstream spectra; and mitigate self-echo to each receiver of the two or more receivers using the Zipper scheme, wherein the self-echo is caused by a transmitter corresponding to each receiver of the two or more receivers due to spectral leakage from an upstream frequency band into a downstream frequency band and vice versa. - View Dependent Claims (52, 53, 54, 55, 56)
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Specification