Studies on clipping and intermodulation distortion in hybrid fibre-coax networks.
|Student Report - Yi An - November 2006 |
Student report, COM-DTU, Department of Communications, Optics and Materials, Technical University of Denmark, Kgs. Lyngby, Denmark. Supervisors: Christophe Peucheret
, Claus Elsner Dreisig
, Frank Elm Jakobsen
Analog subcarrier multiplexing (SCM) hybrid fiber-coax (HFC) cable TV (CATV) systems call for upgrading to digital systems. However the number of channels available on a single laser and performance are limited by the clipping and intermodulation distortions. In analog systems, their impact has been studied for two decades. From 1990's, people have began to study the impact on digital channels. However, optical transmission of an all-digital CATV system has not been studied yet. In this report, clipping and intermodulation distortion in analog HFC systems are numerically and experimentally examined, and their impact on 64 quadrature amplitude modulation (QAM) is also studied. A 73-channel 64-QAM SCM system has been demonstrated with direct modulation. The potential limitations and the maximum number of QAM channels have been investigated.
Yi_An_Special_Course_CATV.pdf (only available from COM•DTU)
Record created 2008-03-26, last modified 2008-10-15
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