Method and system for providing window shaping for multiline transmission in a communications system
First Claim
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1. A method, comprising:
- designing a TEQ (Time EQualizer) in a DMT (Discrete Multi-Tone) system to improve throughput performance by;
selecting in the DMT system an eigenvector with a subspace-based design method; and
computing in the DMT system TEQ filter coefficients with the eigenvector; and
reducing in the DMT system the number and severity of notches that the TEQ introduces in a transfer function of a shortened main channel in the DMT system,wherein the eigenvector used to compute the TEQ filter coefficients does not correspond to a maximum eigenvalue,wherein selecting the eigenvector comprises maximizing an achievable bitrate over a subspace of eigenvectors, andwherein the subspace of eigenvectors has a basis of eigenvectors corresponding to a set of eigenvalues that are comparable in magnitude to the maximum eigenvalue.
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Abstract
A method and system for providing window shaping for multiline transmission in a communications system are described. A last portion of a prefix symbol is extracted. A prefix with a prefix window is shaped to create a shaped prefix. A DMT symbol is shaped with a DMT window to create a shaped DMT symbol. The shaped DMT symbol is combined with the shaped prefix.
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Citations
29 Claims
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1. A method, comprising:
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designing a TEQ (Time EQualizer) in a DMT (Discrete Multi-Tone) system to improve throughput performance by; selecting in the DMT system an eigenvector with a subspace-based design method; and computing in the DMT system TEQ filter coefficients with the eigenvector; and reducing in the DMT system the number and severity of notches that the TEQ introduces in a transfer function of a shortened main channel in the DMT system, wherein the eigenvector used to compute the TEQ filter coefficients does not correspond to a maximum eigenvalue, wherein selecting the eigenvector comprises maximizing an achievable bitrate over a subspace of eigenvectors, and wherein the subspace of eigenvectors has a basis of eigenvectors corresponding to a set of eigenvalues that are comparable in magnitude to the maximum eigenvalue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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means for designing a TEQ (Time EQualizer) in a DMT (Discrete Multi-Tone) system to improve throughput performance including; means for selecting an eigenvector with a subspace-based design method; and means for computing TEQ filter coefficients with the eigenvector; and means for reducing the number and severity of notches that the TEQ introduces in a transfer function of a shortened main channel in the DMT system, wherein the eigenvector used to compute the TEQ filter coefficients does not correspond to a maximum eigenvalue, wherein means for selecting the eigenvector comprises means for maximizing an achievable bitrate over a subspace of eigenvectors, and wherein the subspace of eigenvectors has a basis of eigenvectors corresponding to a set of eigenvalues that are comparable in magnitude to the maximum eigenvalue. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer readable medium, having stored thereon computerreadable instructions, which when executed in a computer system, cause the computer system to:
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design a TEQ (Time EQualizer) in a DMT (Discrete Multi-Tone) system to improve throughput performance by; selecting an eigenvector with a subspace-based design computer readable medium by maximizing an achievable bitrate over a subspace of eigenvectors; and computing TEQ filter coefficients with the eigenvector; and reduce the number and severity of notches that the TEQ introduces in a transfer function of a shortened main channel in the DMT system, wherein the eigenvector used to compute the TEQ filter coefficients does not correspond to a maximum eigenvalue, and wherein the subspace of eigenvectors has a basis of eigenvectors corresponding to a set of eigenvalues that is comparable in magnitude to the maximum eigenvalue. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of processing a received DMT symbol in a DMT system that is preceded by a prefix and does not include a suffix, the method comprising:
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extracting in the DMT system a last portion of a prefix symbol; shaping in the DMT system a prefix with a prefix window to create a shaped prefix; shaping in the DMT system a DMT symbol that does not include a suffix with a DMT window to create a shaped DMT symbol; and combining in the DMT system the shaped DMT symbol and the shaped prefix, wherein the combined shaped DMT symbol and shaped prefix generate a full rectangle symbol with a length less than or equal to a boundary prefix length.
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29. A method of processing a received DMT symbol in a DMT system that has not been windowed for transmission, the method comprising:
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extracting in the DMT system a last portion of a prefix symbol; shaping in the DMT system a prefix with a prefix window to create a shaped prefix; shaping in the DMT system a DMT symbol that has not been windowed for transmission with a DMT window to create a shaped DMT symbol; and combining in the DMT system the shaped DMT symbol and the shaped prefix, wherein the combined shaped DMT symbol and shaped prefix generate a full rectangle symbol with a length less than or equal to a boundary prefix length.
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Specification