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Proceedings Paper

Performance analysis of QAM-VADSL systems for FTTC networks
Author(s): Pedro M. Crespo; Javier Garcia-Frias
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Paper Abstract

Digital transport capabilities to a home served by a fiber-to-the-curb network are limited by the transmission characteristics of the twisted-pair drop cable. However, advanced digital signal processing techniques can substantially increase the data transmission capability over the relatively short lengths of these metallic sections. The purpose of this study is to estimate the maximum achievable information rate versus drop cable length (between 100 to 500 meters), when very high rate asymmetric digital subscriber line (VADSL) modems, with a QAM modulation technique, are used. Different QAM constellations have been analyzed and two types of disturbances have been considered: far-end crosstalk (FEXT) and additive white Gaussian noise (AWGN). Simulation results show that FEXT is a greater impairment than AWGN, and that a 16-QAM constellation outperforms any other number.

Paper Details

Date Published: 24 November 1995
PDF: 11 pages
Proc. SPIE 2609, Hybrid Fiber-Coax Systems, (24 November 1995); doi: 10.1117/12.227272
Show Author Affiliations
Pedro M. Crespo, Telefonica Investigacion y Desarrolo (Spain)
Javier Garcia-Frias, Telefonica Investigacion y Desarrolo (Spain)


Published in SPIE Proceedings Vol. 2609:
Hybrid Fiber-Coax Systems
Wai Sum Lai; Sam T. Jewell, Editor(s)

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