NDLI: Point to Multipoint Channel Estimation by "Abuse" of Receivers

Content Provider	IEEE Xplore Digital Library
Author	Ilani, I.
Copyright Year	2006
Description	Author affiliation: Member, IEEE, Company Scientist of Actelis Networks, Petach-Tikvah, Israel. phone: +972-3924-3491; fax: +972-3924-3492; e-mail: Ishai.Ilani@actelis.com (Ilani, I.)
Abstract	With increasing bandwidths and decreasing loop lengths, crosstalk becomes the main impairment in VDSL systems. For downstream communication, crosstalk precompensation techniques have been designed to cope with this issue by using the collocation of the transmitters. These techniques naturally need an accurate estimation of the crosstalk channel responses. This paper investigates the issue of estimating and tracking these channels. It was previously thought that efficient estimation schemes must use some part of the upstream or downstream bit rates. Moreover, it was assumed that the training signals and their duration must be coordinated between the collocated transmitters and the receivers. In this paper, a new algorithm is presented that practically needs no real-time coordination between the transmitters and the receivers and only needs a very narrow-band control channel between the transmitters and the receivers. The principle is to define two different types of precoding matrices, namely estimation precoding matrices (EPM) for estimation and tracking and cancellation precoding matrices (CPM) for the actual FEXT precompensation. During the estimation period the information symbols are modulated by the estimation precoding matrices, which cause the transmitted symbols to be slightly distorted. These distorted signals "abuse" the adaptive filters at the receivers, and cause the filters to converge to parameters that are functions of the crosstalk channel responses. The proposed estimation algorithm allows upgrading of SISO VDSL systems into FEXT cancelled systems by upgrading the transmitters alone without replacing the existing receivers.
Starting Page	146
Ending Page	150
File Size	5556674
Page Count	5
File Format	PDF
ISBN	1424402298
DOI	10.1109/EEEI.2006.321131
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-11-15
Publisher Place	Israel
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Channel estimation Transmitters Crosstalk Feedback Bandwidth Adaptive filters Frequency estimation Attenuation Degradation Additive noise VDSL cancellation precoding matrices estimation precoding matrices FEXT MIMO
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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