A Low Complexity Linear Precoding Technique for Next Generation VDSL Downstream Transmission Over Copper

In this paper, we study a simplified linear precoding scheme for far-end crosstalk (FEXT) cancellation in very high bit-rate digital subscriber line (VDSL) downstream transmission. We compare the proposed method to zero-forcing (ZF) FEXT cancellation and show that for multipair VDSL systems the meth...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2007-11, Vol.55 (11), p.5527-5534
Main Authors: Leshem, A., Li Youming
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Array signal processing
Cancellation
Channels
Coding, codes
Complexity
Copper
Crosstalk
Crosstalk mitigation
Detection, estimation, filtering, equalization, prediction
Digital
DIGITAL COMMUNICATION SYSTEMS
Digital subscriber line
digital subscriber line (DSL)
Exact sciences and technology
Frequency estimation
Information, signal and communications theory
linear precoding
Miscellaneous
multichannel receivers
multichannel transmission
Optical scattering
Parameter estimation
Sensor arrays
Signal and communications theory
Signal processing
Signal processing algorithms
Signal resolution
Signal, noise
Silicon
Speech processing
Telecommunications and information theory
Tracking
VDSL2
vectored transmission
very high bit-rate DSL (VDSL)
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Summary:In this paper, we study a simplified linear precoding scheme for far-end crosstalk (FEXT) cancellation in very high bit-rate digital subscriber line (VDSL) downstream transmission. We compare the proposed method to zero-forcing (ZF) FEXT cancellation and show that for multipair VDSL systems the method achieves rates that are close to the ZF precoding method. We also derive simple lower bounds on the performance that allows us to predict the performance of the proposed algorithm on each tone. We end up with testing the proposed method on theoretical and empirical channels. This is the first extensive study of VDSL precoding on measured channel data. The proposed method is less complex than ZF precoding and, therefore, alleviates the computational load at the initialization and tracking of precoded VDSL or VDSL2 systems. Finally, we discuss implementation complexity in terms of total Silicon area and show that the method has favorable implementation complexity, since only channel coefficients need to be stored during steady-state transmission.
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2007.898759