通信工程畢業(yè)設(shè)計(jì)外文翻譯--下一代無線寬帶的目標(biāo)（4g—5g）

1、中文 中文 5400 字出處： 出處：Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th. IEEE, 2003, 4: 2317-2321附 錄一、英文原文： 一、英文原文：Goals Of True Broad band’s Wireless Next Wave (4G-5G)K.R.Santhi,Prof.V.K.Srivastava,G.S

2、enthilKumaran,Eng. Albert Butare .Kigali Institute of Science Technology and Management (KIST),B.P.3900, Kigali, Rwanda.AbstractAs access technology increases, voice, video,multimedia, and broadband data services are bec

3、oming 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

4、 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

5、 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 und

6、efined “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 vis

7、ions 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. INTR

8、ODUCTIONWhile 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 b

9、y academic R it is a coming together of services and markets.We need all network that utilizes IP in its fullest form with converged voice and data capability,which the 4G will achieve.G. Cost4G systems will prove far c

10、heaper than 3G, since they can be built atop existing networks and won't require operators to completely retool and won't require carriers to purchase costly extra spectrum.Also an open system IP wireless enviro

11、nment would probably further reduces costs for service providers by ushering in an era of real equipment interoperability.H. ScalabilityScalability, or the ability to handle increasing numbers of users and diversity of s

12、ervices, is more challenging with mobile networks.“Design for Scalability,“ includes information that can help you meet changing usage demands .Because an all IP core layer of 4G is easily scalable, it is ideally suited

13、to meet this challenge.III.EVOLUTION AND COMPARISON OF BROADBAND WIRELESS1) First Generation (1G): 1G wireless mobile communication systems, was introduced in the early 1980s.1G wireless was analog and supported the firs

14、t generation of analog cell phones. They include a signaling protocol known as SS7 (Signaling System 7).2) Second Generation (2G): 2G systems, fielded in the late 1980s, were intended primarily for voice transmission an

15、d was all about digital PCS.3) Third Generation (3G): 3G in wireless will be a deliberate migration to faster, data-centric wireless networks. The immediate goal is to raise transmission speeds from 125kbps to 2M bit/sec

16、.4) Fourth Generation (4G): In reality, as of first half of 2002, 4G is a conceptual framework for or a discussion point to address future needs of a universal high speed wireless network that will interface with wire li