Mitigating Disorderly Leaving Events in G.fast

Summary, in English

Vectoring is a vital component of wideband wire- line communication systems. A disorderly leaving event (DLE) disturbs the vectoring operation since the precoder, which was designed for the channel before the change, is no longer up to date. Measurements indicate that the impact of a DLE can be serious for frequencies beyond 30 MHz, which corresponds to the band used by emerging wideband communication systems over short multi-pair copper cables such as G.fast. As an alternative to the state-of-the-art update procedure, this paper presents an approach to mitigating the DLE problem. By interpreting DLE with the FEXT-reflected-NEXT (FRN) model, we propose a scheme that enables the showtime lines to return to disturbance-free transmission once the loss of signal on a certain line is detected while updating the precoder as a background process. Furthermore, the estimation complexity for a K-user vectoring group is reduced from O(K^2) to O(K).

• Author: Yezi Huang; Thomas Magesacher; Eduardo Medeiros; Chenguang Lu; Per-Erik Eriksson; Per Ödling
• Department/s: Department of Electrical and Information Technology
• Publishing year: 2015
• Language: English
• Pages: 939-944
• Publication/Series: 2015 IEEE International Conference on Communications (ICC)
• Links: http://dx.doi.org/10.1109/ICC.2015.7248443
• Document type: Conference paper
• Publisher: IEEE - Institute of Electrical and Electronics Engineers Inc.
• Topic: Telecommunications
• Keywords: residual crosstalk mitigation; vectoring; disorderly leaving events; G.fast
• Conference name: IEEE International Conference on Communications, ICC 2015
• Conference date: 2015-06-08 - 2015-06-12
• Conference place: London, United Kingdom
• Status: Published
• Research group: Broadband Communication