Adaptive frequency-domain reference noise canceller for multicarrier communications systems
First Claim
Patent Images
1. A method, comprising:
- receiving, by a receiver device, a data signal and a reference signal;
aligning, by the receiver device, data blocks in the data signal with data blocks in the reference signal to increase cross-correlation between an aligned data signal and an aligned reference signal as compared to cross-correlation between the data signal and the reference signal; and
cancelling, by the receiver device and in a frequency domain, interference in the aligned data signal.
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Abstract
A method and apparatus to align data blocks in a data signal and a reference signal to increase cross-correlation between the data signal and the reference signal as compared to the unaligned data and reference signals and cancel interference in the data signal in the frequency-domain under changing conditions and in the presence of the data signal.
226 Citations
37 Claims
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1. A method, comprising:
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receiving, by a receiver device, a data signal and a reference signal; aligning, by the receiver device, data blocks in the data signal with data blocks in the reference signal to increase cross-correlation between an aligned data signal and an aligned reference signal as compared to cross-correlation between the data signal and the reference signal; and cancelling, by the receiver device and in a frequency domain, interference in the aligned data signal. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus, comprising:
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a block aligner configured to align data blocks in a data signal received from a data line with data blocks in a reference signal received from a reference line to increase cross-correlation between the data signal and the reference signal as compared to unaligned data and reference signals; and a tone-by-tone canceller configured to cancel, in a frequency domain, interference in the aligned data signal. - View Dependent Claims (7, 8, 9)
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10. A method, comprising:
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generating an interference estimate for a data signal; adaptively updating an interference canceller with the interference estimate; and aligning blocks of the data signal with blocks of a reference signal to increase cross-correlation between an aligned data signal and an aligned reference signal as compared to cross-correlation between the data signal and the reference signal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus, comprising:
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a block aligner configured to align data blocks in a data signal and data blocks in a reference signal to increase cross-correlation between an aligned data signal and an aligned reference signal as compared to cross-correlation between the data signal and the reference signal; and a tone-by-tone canceller operating in a frequency domain, configured to reduce interference in the aligned data signal, the tone-by-tone canceller comprising; a constellation decision logic module configured to perform constellation decoding, a first adder configured to subtract an output of the constellation decision logic module from an input of the constellation decision logic module to form an error estimate, an interference estimator module configured to estimate interference in the aligned reference signal based upon the error estimate to provide an interference estimate, and a second adder configured to subtract the interference estimate from the aligned data signal. - View Dependent Claims (17, 18)
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19. A method, comprising:
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aligning blocks of a data signal with blocks of a reference signal to increase cross-correlation between an aligned data signal and an aligned reference signal as compared to cross-correlation between the data signal and the reference signal; and cancelling, using a tone-by-tone cancelling device and in a frequency domain, interference in the aligned data signal. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus, comprising:
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a block aligner configured to align data blocks in a data signal and data blocks in a reference signal to increase cross-correlation between an aligned data signal and an aligned reference signal as compared to cross-correlation between the data signal and the reference signal; and a tone-by-tone canceller, operating in a frequency domain, configured to cancel interference in the aligned data signal. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. An apparatus, comprising:
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means for receiving a data signal and a reference signal; means for aligning data blocks in the data signal with data blocks in the reference signal to maximize cross-correlation between the data signal and the reference signal; and means for cancelling interference in the data signal in a frequency domain. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification