The Effect of Ingress Noise on a Digital Signal Transmission in the Two-way CATV System Using UHF Upstream Band

The Effect of Ingress Noise on a Digital Signal Transmission in the Two-way CATV System Using UHF Upstream Band

In this paper, it is shown that upstream digital signals are affected by the ingress noise in the upstream band of a two-way CATV system. The carrier-to-noise ratio of the digital data signal may be reflected by the immunity characteristics of each subscriber's unit, which consists of a CATV pr...

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Veröffentlicht in:Eizō Jōhō Media Gakkaishi 2002/09/01, Vol.56(9), pp.1481-1487
Hauptverfasser: Sugiura, Toshihiro, Shibata, Junichi
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Sprache:eng ; jpn
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Shibata, Junichi
description In this paper, it is shown that upstream digital signals are affected by the ingress noise in the upstream band of a two-way CATV system. The carrier-to-noise ratio of the digital data signal may be reflected by the immunity characteristics of each subscriber's unit, which consists of a CATV protector connected to a coaxial cable. It was found by bit-error-rate measurement in the two-way CATV model system that the value of the relative operating level is smaller in the UHF upstream band than the value in the HF to VHF one.
doi_str_mv 10.3169/itej.56.1481
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subjects 16QAM
QPSK
title The Effect of Ingress Noise on a Digital Signal Transmission in the Two-way CATV System Using UHF Upstream Band
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