Cooperative MIMO for alien noise cancellation in upstream VDSL

We present cooperative MIMO for alien noise cancellation (CoMAC): a per-tone, blind, low-complexity, linear, and adaptive noise whitening algorithm for alien crosstalk mitigation in upstream vectored VDSL systems. CoMAC directly acts on the residual errors of the vectored users after self-FEXT cance...

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Bibliographic Details
Main Authors: Biyani, P., Mahadevan, A., Duvaut, P., Singh, S.
Format: Conference Proceeding
Language:English
Subjects:
Additive noise
blind noise whitening
Central office
Crosstalk
Data communication
Frequency domain analysis
Hardware
MIMO
Noise cancellation
Radio spectrum management
Signal to noise ratio
VDSL
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Summary:We present cooperative MIMO for alien noise cancellation (CoMAC): a per-tone, blind, low-complexity, linear, and adaptive noise whitening algorithm for alien crosstalk mitigation in upstream vectored VDSL systems. CoMAC directly acts on the residual errors of the vectored users after self-FEXT cancellation and frequency domain equalization, and thus, leverages the inherent alien-crosstalk-induced spatial correlation across users. CoMAC employs a low-complexity recursion scheme derived from the optimal MMSE noise whitener to non-disruptively initialize, engage, and adapt the noise canceller while the vectored users operate in data mode. Assuming reliable transmit symbol estimation at its input, we show that CoMAC achieves the Cramer-Rao lower bound. Further, the SNR improvements accruing from CoMAC can be translated into substantial rate improvements for upstream vectored VDSL.
ISSN:1520-6149
2379-190X
DOI:10.1109/ICASSP.2009.4960166