(Fiber Wireless Network Architecture)
Gande Kiran Kumar,
MallaReddy Inst of Eng& Tech(MRIET) ,
,Gajula Vijay Kumar ,
MallaReddy Inst of Eng& Tech(MRIET)
Abstract— The ultimate goal of Fiber Wireless (FI-WI) networks is to convergence of various optical and wireless technologies under a single infrastructure in order to take advantage of their complementary features and therefore providing a network capable of supporting bandwidth hungry emerging applications for both fixed and mobile clients. The Fi-Wi architecture is based on radio fiber(R&F) network integration ,an approach that is different from radio over fiber proposal. It distinguishes Fi-Wi R&S architectures based on three level network deployment of different optical and wireless technologies and classifies them based on technology used in the first level network.
Index Terms : R&F , Fi-Wi , Hybrid Access Network.
Technological evolutions in internet gave rise to new demanding applications and services that copper based access networks cannot support efficiently .High definition IPTV(HDIPTV),video on demand(VoD) and online interactive gaming are only some of the services that require data rates up to 10Mbps per client. This has lead many providers to seek alternative mediums and infrastructures that would be able to provide such large capacities in the access network .Optical technology was adopted by many providers to seek alternative mediums . Since fiber is a medium capable of supporting with rates in Gbps region. Apart from fixed optical networks, wireless broadband networks have attracted a great deal of attention due to their low implementation costs and mobility support .Wi-Fi based wireless LAN’s have undoubtedly dominated the wireless LAN’s market while cellular communication networks have also seen a huge growth especially after recent commercial success of smart phones which has increased even more the number of mobile broadband subscribers. Moreover new emerging wireless standards like Wi-Max was designed to support broadband services with high data rates seamless mobility over large distances.
Optical networks offer a huge capacity but with high implementation cost while wireless network offer mobility with low rates and via error prone channels. This idea of combining these two networks is very attractive since it would allow exploitation of complementary benefits of both the technologies .This idea lead to Fi-Wi network proposal where optical and wireless technologies form a common integrated infrastructure capable of supporting upcoming applications and services while offering seamless mobility to clients.
Two approaches are investigated for the integration of optical and wireless network under Fi-Wi concept. • Radio over Fiber(RoF)
• Radio and Fiber(R&F)
RADIO OVER FIBER(RoF)
In RoF systems RF signals that modulate an optical carrier in a Central Office (CO) are being propagated over an analog fiber link to Remote Antenna Units (RAUs) and are then transmitted to clients through the air. RoF technology is based on a centralized signal processing functionality where network complexity is moved to a central location and thus the overall implementation cost is reduced mainly because RAUs contain fewer components due to their simpler functionality. Resource allocation can be done more efficiently from a centralized unit while handover and operational-maintenance procedures become simpler. Moreover, the use of more simplified RAUs helps reduce the overall power consumption which is an increasingly critical factor in current and future network deployments.