Coexistence analysis of asynchronous digital subscriber lines with different sampling rate and carrier frequency spacing

Drakulic, Sanda; Wolkerstorfer, Martin; Statovci, Driton

doi:10.1109/glocom.2014.7037140

Cited by 7 publications

(9 citation statements)

References 9 publications

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“…If systems asynchronously transmit DMT symbols with different band width, carrier spacing and sampling rate, there is ICI [11]. Under ICI, the aggregate crosstalk interference for asynchronous transmission χ async,n k experienced by user n on tone k is [6] χ async,n…”

Section: A Synchronous and Asynchronous Transmissionmentioning

confidence: 99%

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Impact-analysis for coexisting G.fast and vectored VDSL2

Hincapie

Maierbacher

2015

2015 IEEE Conference on Standards for Communications and Networking (CSCN)

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G.fast recently standardized by the ITU aims at providing gigabit access from the Distribution Point (DP). The deployment of this new technology will be progressive as previous technological migrations, so G.fast will share the access network with existing DSL systems, particularly with vectored VDSL2. However, G.fast and vectored VDSL2 as defined by the standards are spectral-incompatible due to their overlapping spectrum, different carrier spacing implementation and conflicting multiplexing schemes. This work analyzes the coexistence issues that arise when G.fast and vectored VDSL2 services are deployed from the DP. Potential gains that could be obtained by introducing a synchronized transmission scheme, as well as the effectiveness of spectral-compatible band plans are discussed in order to help determine if those measures should be developed further and/or considered for standardization. In order to achieve this goal, we establish far-end crosstalk (FEXT) and near-end crosstalk (NEXT) models for realistic simulations and analyze the system performance for different deployment scenarios that reproduce the progressive migration from VDSL2 to G.fast. Our results show that synchronization between vectored VDSL2 and G.fast barely improves their performance, whereas the deployment of spectral-compatible band plans is an effective means to improve vectored VDSL2 performance with tolerable impact on G.fast

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Section: A Synchronous and Asynchronous Transmissionmentioning

confidence: 99%

“…Figure 3 shows the mean downstream percent loss (PL) with respect to the line length, i.e., the reach-percent-loss curve, for G.fast-dominated, balanced and VDSL2-dominated scenarios. We evaluate the two possible symbol alignments [11]: full alignment [11, eq. (5), eq.…”

Section: B Potential Gains Of Synchronous Transmission Implementationmentioning

confidence: 99%

Impact-analysis for coexisting G.fast and vectored VDSL2

Hincapie

Maierbacher

2015

2015 IEEE Conference on Standards for Communications and Networking (CSCN)

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“…Furthermore, the lines inside a single Vectoring group may suffer from residual crosstalk among users (including self-crosstalk) [7], caused by timevarying and finite precision Vectoring channel information. We also consider ICI among lines of different Vectoring groups/technologies, which arises due to asynchronism as well as differences in modulation parameters (e.g., DMT tone spacing) [10].…”

Section: System Modelmentioning

confidence: 99%

“…The ICI model is detailed in [15], [10]. It is based on a signal-level analysis of a back-to-back transmission (i.e., excluding the channel) between two DMT transceivers with different modulation parameters.…”

Section: A Channel Modelmentioning

confidence: 99%

“…This leads to strong near-end crosstalk (NEXT) at both, the network side as well as the CPE side, and far-end crosstalk (FEXT) in US and DS transmission direction, respectively. Further effects include inter-carrier interference (ICI) among Vectoring groups that are based on different DSL technologies [10], residual crosstalk among Vectoring lines [7], noncontinuous net-data-rate objectives and constraint functions [11], and the coupling among Vectoring users in terms of per-transceiver power spectral density (PSD) and aggregate transmit power (ATP) constraints [8].…”

Section: Introductionmentioning

confidence: 99%

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Maintaining harmony in the vectoring xDSL family by spectral coordination

Wolkerstorfer

Statovci

Drakulic

2015

2015 49th Asilomar Conference on Signals, Systems and Computers

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In multi-user and multi-carrier Digital Subscriber Line (DSL) access networks various DSL technologies, with or without crosstalk cancelation (Vectoring) capabilities, may coexist. Spectral resource management promotes collaboration among users. However, resource allocation is complicated by inter-carrier interference and strong near-end crosstalk due to mixed/asynchronous DSL technologies. Furthermore, Vectoring is subject to residual crosstalk, as well as coupling per-transceiver and per-carrier power constraints. We present a joint model of these effects, and analyze the net-data-rates of the recent G.fast and 35 MHz VDSL2 technologies in a specific coexistence scenario. The results exemplify the tradeoff between upstream and downstream net-data-rates.

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