Power-efficient copper access

Guenach, M.; Nuzman, C.; Maes, Jochen; Peeters, Michael; Li, Yan; Bruyssel, Danny Van; Defoort, Frank

doi:10.1002/bltj.20444

Cited by 8 publications

(10 citation statements)

References 9 publications

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“…4 for an illustration. In [14] it is recommended that the (received) AN power levels should follow the spectral shape of the crosstalk noise (i.e., the optimal VN setting), and set at (or slightly below) the crosstalk power levels, as also described in [22]. However, from Fig.…”

Section: Simulation Results For Multiple Users and Fixed Marginsmentioning

confidence: 99%

“…Using this definition the optimal modified bit-loading problem is given similarly as in (13a)-(13d), differing only in the higher background noise (n k u +t k u ) and the altered AN levels in (14).…”

Section: Worst-case-stable Sequential Initializationmentioning

confidence: 99%

“…The activation of low-power modes (LPM) [14] in the digital subscriber line (DSL) access network implies frequent transmit power changes, resulting in signal-to-noise ratio (SNR) variations with which current DSL systems can hardly cope [22]. We study the problem of stabilizing DSL systems when using LPMs.…”

Section: Introductionmentioning

confidence: 99%

“…One commercially available [1] solution for protecting legacy DSL systems is the injection of "artificial noise" (AN) at the transmitter in order to shift eventual variations of the crosstalk noise inside the specified SNR margin which is considered during the initialization of the modems [22]. Besides the empirical rules in [14,22], to the best of our knowledge the problem of setting the AN power spectrum has not been studied so far.…”

Section: Introductionmentioning

confidence: 99%

“…The two proposals in [8] to resolve this issue partly require changes in standards or do not allow for immediate transitions back into the full-power mode (e.g., in less than 3 s as foreseen in [18]). The most promising proposal made in [14] is to physically inject additional "artificial noise" (AN) at the transmitter (i.e., at the central office) and thereby to reduce the relative impact of future crosstalk variations on the perceived SNR. A related technique is "virtual noise" (VN) [24] which is a frequency selective, tunable receiver-noise parameter masking the crosstalk noise.…”

Section: Introductionmentioning

confidence: 99%

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Enabling greener DSL access networks by their stabilization with artificial noise and SNR margin

2012

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Low-power modes (LPM) are a standardized means in asymmetric digital subscriber lines (ADSL) 2 for reducing the power consumption at the central office. However, the activation of LPMs is hampered by the operators' concern for instability introduced by frequent transmit power changes. The injection of artificial noise (AN) has been proposed as a standard-compliant stabilization technique. We develop an analytical solution for setting the AN power spectrum. Based on this solution we jointly optimize the AN power spectrum and the signal-to-noise ratio (SNR) margin. Simulation results show the performance gain in terms of rate and energy compared to heuristic rules for setting the AN power spectrum. We propose and demonstrate three approaches for evaluating the performance of AN-enabled DSL systems, including (a) joint spectrum balancing, AN, and margin optimization, (b) single-user worstcase-stable optimization, and (c) worst-case-stable optimization based on sequential initialization. Simulation results confirm a strong dependency of the performance under AN on the selected SNR margins, and highlight the total AN power consumption as well as the residual energy savings under low-power modes stabilized by AN.

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Section: Simulation Results For Multiple Users and Fixed Marginsmentioning

confidence: 99%

Section: Worst-case-stable Sequential Initializationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enabling greener DSL access networks by their stabilization with artificial noise and SNR margin

2012

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Energy-saving by low-power modes in ADSL2

2012

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Energy Efficient Transmission Based on Grouped Spatial Modulation for Upstream DSL Systems

Zhang

Bai

et al. 2019

IEEE Access

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The digital Subscriber Line (DSL) remains an important component of heterogeneous networking, especially in historic city-centers, where using optical fibre is less realistic. Recently, the power consumption has become an important performance metric in telecommunication due to the associated environmental issues. In the recent bonding model, customer sites have been equipped with two/four copper pairs, which may be exploited for designing grouped spatial modulation (SM) aiming for reducing the power consumption and mitigating the stubborn crosstalk in DSL communications. Explicitly, we view the two pair copper pairs equipped for each user as a group and propose an energy efficient transmission scheme based on grouped SM strategy for the upstream DSL systems, which is capable of reducing the power consumption of the upstream transmitters by activating a single copper line of each user. More especially, in order to compensate for the potential bit-rate reduction imposed by reducing the number of activated lines, the proposed scheme implicitly delivers "virtual bits" via activating/deactivating the lines in addition to the classic modulation scheme. This is particularly beneficial in the DSL context, because the crosstalk imposed by activating several lines may swamp the desired signal. Furthermore, a pair of near-optimal soft turbo detection schemes are proposed for exploiting the unique properties of the DSL channel in order to eliminate the error propagation problem of SM detection routinely encountered in wireless channels. Both the attainable energy-efficiency and the achievable Bit Error Ratio (BER) are investigated. Our simulation results demonstrate that the proposed group-based SM is capable of outperforming the vectoring scheme both in terms of its energy efficiency for all the examined loop lengths and transmit powers. Moreover, the proposed group-based SM is capable of outperforming the vectoring scheme both in terms of its BER performance in lower frequencies and longer serviced DSL loop lengths.

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Power-efficient copper access

Cited by 8 publications

References 9 publications

Enabling greener DSL access networks by their stabilization with artificial noise and SNR margin

Enabling greener DSL access networks by their stabilization with artificial noise and SNR margin

Energy-saving by low-power modes in ADSL2

Energy Efficient Transmission Based on Grouped Spatial Modulation for Upstream DSL Systems

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