Abstract
Abstract Recently, it has been proposed the use of WiMAX for the return channel in digital television systems using a new frequency profile bellow 1 GHz, which has been calledWiMAX-700. The profile operates from 400 MHz to 960 MHz as primary band, which includes the UHF band, and optionally from 54 MHz to 400 MHz as secondary band. This work presents some aspects of the WiMAX-700 technology and some simulation results of models designed to determine the system capacity concerning the number of actives subscriber stations, according to specific proposed scenarios, traffic sources profiles, specifics propagation, and coverage conditions. The results presented in this work provide elements to determine the suitability of WiMAX-700 technology as the return channel for the interactive digital television applications.
Highlights
Brazil has recently defined its Digital TV System based on the Japanese ISDB-T
Concerning the Return Channel (RC), among the technologies currently previewed in ARIB are dialup modems, ISDN for wired lines and PDC - Personal Digital Cellular and PHS - Personal Handy-Phone System for wireless
This paper is structured as follow: section II deals with WiMAX-700 as return channel for the SBTVD-T, section III presents WiMAX-700 channeling techniques, section IV presents some results of a simulation environment including several traffics estimates; and section V concludes the paper
Summary
Brazil has recently defined its Digital TV System based on the Japanese ISDB-T. The Brazilian system (SBTVD-T) uses the same modulation technique of the ISDB-T system, known as BST-OFDM - Band Segmented Transmission - Orthogonal Frequency Division Multiplexing, which consists of a series of frequency blocs called OFDM segments that provide DTV transmission for fixed and mobile receivers simultaneously. Among the Brazilian innovations, there is a new proposal of middleware that is based on the NCL language, that is a declarative language for hypermedia documents authoring and object synchronizing Another important innovation regards a new WiMAX profile that cover the UHF and VHF television bands which is the main purpose of this paper. Concerning the Return Channel (RC), among the technologies currently previewed in ARIB are dialup modems, ISDN for wired lines and PDC - Personal Digital Cellular and PHS - Personal Handy-Phone System for wireless. The main motivation to include wireless standards as return channel in the SBTVD-T is the increasing observed rate of mobile phone users in Brazil, having surpassed the number of fixed lines by more than two folds. This paper is structured as follow: section II deals with WiMAX-700 as return channel for the SBTVD-T, section III presents WiMAX-700 channeling techniques, section IV presents some results of a simulation environment including several traffics estimates; and section V concludes the paper
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