下一代无线宽带的目标(4G5G)毕业论文外文翻译.docx

Goals Of True Broad band’s Wireless Next Wave (4G-5G)K.R.Santhi,Prof.V.K.Srivastava,G.SenthilKumaran,Eng. Albert Butare .Kigali Institute of Science Technology and Management (KIST),B.P.3900, KigaliAbstractAs access technology increases, voice, video,multimedia, and broadband data services are becoming integrated into the same network. Fourth Generation (4G) is the next generation of wireless networks that will replace third Generation (3G) networks sometimes in future. 4G is intended to provide high speed, high capacity, low cost per bit, IP based services.4G is all about an integrated, global network that’s based on an open system approach. The goal of 4G is to “replace the current proliferation of core cellular networks with a single worldwide cellular core network standard based on IP for control, video, packet data and VoIP. But while 3G haven’t quite arrived, researchers want to contribute their ideas to the development of an as-yet undefined wireless world that could become operational by around 2010. This paper deals with the fundamentals and issues of networks, technologies, spectrum, standards,terminals, services of 4G and about the visions that the network operators and service providers see for the evolution of 4G mobile systems and where is future research from their perspective necessary?Keywords：Wireless, 4G, W-OFDM, MC-CDMA, LAS-CDMA,UWB.I. INTRODUCTIONWhile carriers and handset manufacturers obviously have their hands full with 3G, some companies are already looking beyond this next generation of wireless technology and networks. 4G is simply an initiative by academic RD labs to move beyond the limitations and problems of 3G which is having trouble getting deployed and meeting its promised performance and throughput .While this 3G has not completely reached researchers and vendors are expressing growing interest in 4G why? Two main areas are addressed in these initiatives: An increase of capacity in the radio link and seamless mobility across hetero