Wireless CATV Uplink System with Subcarrier Modulation Using Infrared Communications for Apartment Houses

Yuichi TANAKA  Kazuhiro TOMIOKA  Masatoshi TAKANO  Masao NAKAGAWA  

IEICE TRANSACTIONS on Communications   Vol.E84-B   No.12   pp.3235-3242
Publication Date: 2001/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Wireless Communications
wireless infrared communications,  CATV,  cable modem,  optical subcarrier modulation,  

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CATV networks are considered as promising transmission channels in that they permit wide bandwidth and high quality data communications. In apartment houses, however, the ingress noise in the up-links due to the tree and branch structure of a network deeply degrades the transmission performance of data communication channels. This is a serious problem especially in apartment houses which are often equipped with old coaxial cables. It permits the noise generated from electrical appliances to disturb up-link data communications. In this paper, we propose a wireless CATV system. In the proposed system, the noise generated in the room of a subscriber does not intrude into a trunk line. We analyze the upstream channels of this system. Based on the results of numerical analyses, we found that the proposed system is suitable and practical for up-link operation in CATV networks for apartment houses.