Experimental Evaluation of Capacity Statistics for Short VDSL Loops

Karipidis, Eleftherios; Sidiropoulos, Nicholas D.; Leshem, Amir; Li, Youming

doi:10.1109/tcomm.2005.851626

Cited by 16 publications

(12 citation statements)

References 9 publications

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“…Assume that only user i transmits, there is no interference, and the processor in the ONU only needs to collect the energy received by all receivers. Thus, user i can achieve a data rate of: 7 Maximizing over all users and using definition (15) leads to (22). The second inequality, (23), comes from the observation that β U,2 ≤ β 2 U,max .…”

Section: Umaxmentioning

confidence: 99%

The Performance of Zero Forcing DSL Systems

Bergel

Leshem

2013

IEEE Signal Process. Lett.

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DSL systems use multi-channel processing to mitigate the electromagnetic coupling between the wires in a binder and provide high data rates to multiple users. In recent years, most multichannel processing for DSL had focused on zero-forcing (ZF) processing that was proven to be near optimal.This near optimality has been observed in numerical evaluations as well as in real life systems. However, this near optimality has only been demonstrated theoretically by relatively loose bounds. In this paper we prove novel bounds on the performance of ZF processing in DSL systems. These bounds are simpler and yet tighter than currently known bounds. These novel bounds support previously published results, and further confirm the near optimality of ZF processing.

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Section: Umaxmentioning

confidence: 99%

The Performance of Zero Forcing DSL Systems

Bergel

Leshem

2013

IEEE Signal Process. Lett.

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“…Note that in [3] it is shown that DSM3 provides significant capacity gains only when almost all pairs in a binder are coordinated.…”

Section: Justification Of the Assumptionsmentioning

confidence: 99%

“…We let SNR i (f ) be as in (15) and let Γ be the Shannon Gap comprising modulation loss, coding gain and noise margin. Let R i be the achievable transmission rate of the i-th user in the system defined in (3). Recall that in such a system the crosstalk is completely removed and therefore…”

Section: B Transmission Loss Of a Single Usermentioning

confidence: 99%

Finite Word Length Effects on Transmission Rate in Zero Forcing Linear Precoding for Multichannel DSL

Sayag

Leshem

Sidiropoulos

2009

IEEE Trans. Signal Process.

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Crosstalk interference is the limiting factor in transmission over copper lines. Crosstalk cancelation techniques show great potential for enabling the next leap in DSL transmission rates. An important issue when implementing crosstalk cancelation techniques in hardware is the effect of finite world length on performance. In this paper we provide an analysis of the performance of linear zero-forcing precoders, used for crosstalk compensation, in the presence of finite word length errors. We quantify analytically the trade off between precoder word length and transmission rate degradation. More specifically, we prove a simple formula for the transmission rate loss as a function of the number of bits used for precoding, the signal to noise ratio, and the standard line parameters. We demonstrate, through simulations on real lines, the accuracy of our estimates. Moreover, our results are stable in the presence of channel estimation errors. Finally, we show how to use these estimates as a design tool for DSL linear crosstalk precoders. For example, we show that for standard VDSL2 precoded systems, 14 bits representation of the precoder entries results in capacity loss below 1% for lines over 300m.

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“…Future digital subscriber line (DSL) networks are expected to fulfill demands of very high data rates in a fast growing market. Installing optical fibres in the access networks helps reduce the lengths of used copper segments to carry out much higher throughputs [1]. In such configuration, crosstalk between copper pairs may become orders of magnitude larger than background noise and so is considered as the performance-limiting factor.…”

Section: Introductionmentioning

confidence: 99%