Simulação de redes de acesso híbridas para cidades inteligentes.

Abstract

The concept of Intelligent Cities is related to intelligent development, using infrastructures based on advanced information and communication technologies. Communication is one of the pillars associated to this concept, for it allows to provide many services to the citizens, such as: traffic control, health, education etc. Concerning the subject of communications, the three principal demands related to the band in internet services are: the convergence of voice, data, video and interactive multimedia services in the same network; convergence of DWDM Metropolitan Access Networks with long-haul networks; and the convergence of wireless and optical networks. The issue that motivates this work is the necessity of a structure for robust and flexible communications. Therefore, the development of hybrid Wireless Optical Broadband Access Networks (WOBANs) is important since it is a structure capable of guaranteeing an ample coverage and access penetration, at high transmission rates. A WOBAN consists of an association of two data transmission mediums, optical and wireless, in which there is a back end composed of a passive optical network that ends at a point relatively close to the user, where a wireless front end begins. For the wireless part, more importance is given to WiMAX technology, which allows distances between users up to 50 km and rates up to 65 Mbps. As for the optical portion, a study is conducted considering distinct multiplexing forms, TDM, WDM and a composition of both to better take advantage fiber capacity. There are three forms of transport of RF signals: RF over Fiber; Intermediate Frequency over Fiber; and Baseband over Fiber. Results and simulations of hybrid networks for different multiplexing schemes and technologies involved are shown in order to characterize the maximum attainable distances, capacity and number of users and channels in this kind of access network directed to utilization in intelligent cities.