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Proceedings Paper

Cable modem architectures adapted to the noise problem in the upstream direction for multiple-access hybrid fiber coax networks
Author(s): Johan Haspeslagh; Geert Goris; Mark Van Bladel; Heidi Steendam; Teresa Marongiu; Marc Moeneclaey; Elke Claus; Jon Vandenbruaene; Luc Martens; Paul Gabriel
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Paper Abstract

As interactive services require more bandwidth, high speed access networks must follow this trend. Although a Hybrid Fiber Coax (HFC) system provides a large bandwidth, many problems occur due to the accumulation of the ingress and impulse noise. In this paper the properties of the ingress and impulse noise will be explained based on a measurement campaign on different networks. The most striking result of the measurement campaign is the large dynamic and time- dependent behavior of the ingress noise. This dynamic behavior is an important factor in designing an upstream communication system. We show that for this reason optimized receivers will contain adaptive equalizers. This is illustrated by the performance analysis of a TDMA and an OFDM-CDMA system. Both systems are compared under the same environment. The results of this comparison shows how both can obtain the same performance. Considering the implications of both the TDMA and the CDMA system when using an equalizer in the head-end receiver, requirements for a total HFC network architecture are given. Especially synchronization and initialization issues must be addressed.

Paper Details

Date Published: 16 September 1998
PDF: 12 pages
Proc. SPIE 3408, Broadband European Networks and Multimedia Services, (16 September 1998); doi: 10.1117/12.321875
Show Author Affiliations
Johan Haspeslagh, Alcatel Alsthom (Belgium)
Geert Goris, Alcatel Alsthom (Belgium)
Mark Van Bladel, Univ. of Gent (Belgium)
Heidi Steendam, Univ. of Gent (Belgium)
Teresa Marongiu, Univ. of Gent (Belgium)
Marc Moeneclaey, Univ. of Gent (Belgium)
Elke Claus, Imec-Intec (Belgium)
Jon Vandenbruaene, Imec-Intec (Belgium)
Luc Martens, Imec-Intec (Belgium)
Paul Gabriel, Barco (Belgium)


Published in SPIE Proceedings Vol. 3408:
Broadband European Networks and Multimedia Services
Stephan Fischer; Ralf Steinmetz; Heinrich J. Stuettgen; Harmen R. van As; Roberto Vercelli, Editor(s)

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