Simulação de tecnologias para redes de acesso de faixa larga híbridas óptica-sem fio.

Abstract

The use of access network technologies based on PONs (passive optical networks) is now a reality in dozens of countries. on the other hand, the characteristics of eliminating cabling costs, ease of implantation of the infrastructure and convenience provided to the user, offered by wireless networks (WIRELESS) have made the technology quite popular (especially WIFI technologies. WIMAX and cellular networks ). The radio over fiber technology (ROF - RADIO OVER FIBER), which allows the transport of radio signals over fiber optic links, gave rise to the concept of Wireless-Optical Broadband networks (WOBANs). The purpose of these networks is to create a BACK END of support composed of an optical network, which ends at a point relatively close to the user, from where a FRONT END with a wireless network starts. There are basically three ways of transporting radio frequency waves by optical guides: RF over fiber, IF over fiber or basic band over fiber. This work presents results, by obtaining the BER (bit error rate), eye diagram and signal constellation, of simulation of systems with four channels, for cases of basic band transmission over fiber (using TDM and WDM) ve RF transmission over fiber, using OFDM (ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING) signals, as explained in the WIMAX 9WORLDWIDE INTEROPARABILIUTY FOR MICROWARE ACCESS standard).