16 September 1998 Cable modem architectures adapted to the noise problem in the upstream direction for multiple-access hybrid fiber coax networks
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Proceedings Volume 3408, Broadband European Networks and Multimedia Services; (1998) https://doi.org/10.1117/12.321875
Event: SYBEN-Broadband European Networks and Electronic Image Capture and Publishing, 1998, Zurich, Switzerland
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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Johan Haspeslagh, Johan Haspeslagh, Geert Goris, Geert Goris, Mark Van Bladel, Mark Van Bladel, Heidi Steendam, Heidi Steendam, Teresa Marongiu, Teresa Marongiu, Marc Moeneclaey, Marc Moeneclaey, Elke Claus, Elke Claus, Jon Vandenbruaene, Jon Vandenbruaene, Luc Martens, Luc Martens, Paul Gabriel, Paul Gabriel, } "Cable modem architectures adapted to the noise problem in the upstream direction for multiple-access hybrid fiber coax networks", Proc. SPIE 3408, Broadband European Networks and Multimedia Services, (16 September 1998); doi: 10.1117/12.321875; https://doi.org/10.1117/12.321875
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