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US 9,432,080 B2Granted
Probing and estimation of cross-coupling
AssigneeLantiq Deutschland GmbH
InventorHeinrich Schenk
Life of this patent
Estimating the term…
Abstract
For each channel of a plurality of channels of a Vector transmission system, a sequence of cross-coupling test signals representing a sequence of complex numbers may be transmitted or received. And for each channel of the plurality of channels a sequence of the real part of the sequence of complex numbers is different to a sequence of the imaginary part of the sequence of complex numbers.
Claims20
A method comprising:
- for each channel of a plurality of channels of a VDSL (Very High Bit Rate Digital Subscriber Line) Vector transmission system transmitting a predetermined sequence of cross-coupling test signals representing a sequence of complex numbers to a receiver, each complex number having a real part and an imaginary part, wherein for each channel of the plurality of channels a sequence of the real parts of the complex numbers of the sequence of complex numbers is a different sequence than a sequence of the imaginary parts of the complex numbers of the sequence of complex numbers;
- receiving the sequence of cross-coupling test signals;
- determining a receive error based on the received sequence of cross-coupling test signals and the transmitted sequence of cross-coupling test signals, the determining a receive error comprises determining a complex valued receive error or determining a real part of the complex valued receive error or determining an imaginary part of the complex valued receive error, and
- estimating at least one of coefficients of a cross-coupling precancellation matrix or coefficients of a cross-coupling cancellation matrix based on the receive error.
1 more element
A device comprising:
- a transmitter, wherein the transmitter is operable to transmit a predetermined sequence of cross-coupling test signals representing a sequence of complex numbers over a plurality of VDSL channels, each complex number having a real part and an imaginary part, wherein a sequence of the real parts of the complex numbers of the sequence of complex numbers is orthogonal or pseudo-orthogonal to a sequence of the imaginary part for each channel of the plurality of channels,
- the device being operable to estimate at least one of coefficients of a cross-coupling precancellation matrix or coefficients of a cross-coupling cancellation matrix based on a receive error obtained in response to the sequence of cross-coupling test signals.
A device comprising
- a receiver circuit operable to receive a predetermined sequence of received signals via VDSL and to determine a receive error by comparing the sequence of received signals with cross-coupling test signals representing a sequence of complex numbers, each complex number having a real part and an imaginary part, the sequence of the real parts of the complex numbers of the sequence of complex numbers being orthogonal or pseudo-orthogonal to the sequence of the imaginary parts of the complex numbers of the sequence of complex numbers, the sequence of received signals received on one channel of a plurality of channels,
- the receiver circuit being operable to estimate at least one of coefficients of a cross-coupling precancellation matrix or coefficients of a cross-coupling cancellation matrix based on the receive error.
A VDSL system comprising:
- a plurality of transmitters, each of the plurality of transmitters operable to transmit on one channel of a plurality of VDSL, channels a predetermined sequence of cross-coupling test signals representing a sequence of complex numbers, each complex number having a real part and an imaginary part, wherein for each channel of the plurality of channels a sequence of the real parts of the complex numbers of the sequence of complex numbers is orthogonal or pseudo-orthogonal to a sequence of the imaginary parts of the complex numbers;
- and
- a plurality of receivers, each of the plurality of receivers operable to receive on one of the plurality of channels the transmitted sequence of cross-coupling test signals and to determine a receive error by comparing the sequence of received cross coupling test signals with predetermined cross-coupling test signals,
- wherein the system is operable to determine at least one of a cross-coupling precancellation matrix or a cross-coupling cancellation matrix based on the receive error.
1 more element
Dependencies are inferred from the claim text.