Device and Method for Compensating for and Identifying Crosstalk

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This patent describes a device and method for detecting and compensating for crosstalk—specifically far-end crosstalk (FEXT) and near-end crosstalk (NEXT)—in multi-pair cable systems, commonly found in telecommunications networks. The invention introduces an adaptive digital filter system with customizable delay components, enabling more precise and effective crosstalk mitigation even in systems where the cable pairs are not reciprocally coupled. This technology can be retrofitted to existing wired infrastructure without requiring direct access to all transmitted signals or changes to the network's synchronization mechanisms.

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• Improving data transmission quality and reliability in DSL, VDSL, or G.fast broadband networks using copper cables
• Enhancing Ethernet performance over legacy twisted-pair cabling (e.g., in office LANs)
• Retrofitting telecommunication central offices to boost line capacity without physically replacing cables
• Mitigating crosstalk in powerline communication systems or industrial communication networks
• Increasing performance in building or campus networks with high cable pair density

BenefitsContent extracted from patent full text and abstract with AI.

• Enables effective crosstalk compensation even with non-reciprocally coupled cable pairs, which are common in real-world networks
• Can be integrated or retrofitted into existing telecommunications infrastructure, avoiding costly cable replacements
• Does not require synchronized transmission equipment or access to all transmitted data, allowing flexibility and compatibility
• Optimizes compensation by allowing dynamic adjustment of delay and filter coefficients for different noise scenarios
• Improves reach, stability, and data rates of legacy cable networks, maximizing infrastructure investment
• Transparent operation with respect to data rate and coding, and does not require training sequences or specific network synchronization

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Inventors & Applicants

Patent Abstract

The invention relates to devices and methods designed for different applications, for compensating for and identifying crosstalk, in particular the near-end crosstalk NEXT. The situation arising in practice of non-reciprocally coupled systems receives too little attention. Therefore there is a lack of practical devices and methods for compensating for and identifying far-end crosstalk FEXT, wherein a reliable identification of an unknown system is made possible. In order to allow compensating for far-end crosstalk FEXT, wherein the conductor pairs of the line group are not reciprocally coupled, the device according to the invention for compensating for (90) and identifying interference signals in a telecommunications system comprises at least one compensation circuit (10) connected downstream of dead time elements (94, 94' and 95, 95'), an interference characteristic detection device, and a compensation controller (98) connected thereto, wherein said compensation controller controls the setting of filter coefficients (h[0],..,h[L-1]) of an adaptive filter and the compensation signal source, wherein the adaptive filter is designed as a digital compensation filter (KFT) having filter coefficients (h[0],..,h[L-1]) separated in time by a first delay element (T) having the delay time T, and having an adjustable additional delay time t, and wherein the setting of the additional delay time t takes place together with the setting of filter coefficients (h[0],.., h[L-1). The invention is in the area of devices and methods for detecting and compensating for interference signals in a telecommunications system, in particular for compensating for far-end crosstalk FEXT and/or NEXT.