Project Report on 4 g Wireless 41. Introduction: 1.1.Who Invented 4 g Technology? Prof. Dr. Khoirul Anwar1.2. What is 4 g? A new Mobile generation has appeared approximately every ten year since 1 g. 4 g standardized in 2012. 4 g, short for 3rd generation, is the fourth generation of mobile telecommunications technology succeeding g. A 4 g system, in addition to usual voice and other services of 3 g system, provides mobile ultra-broadband Internet access, for example to laptops with USB wireless modems, to smart phones, and to other mobile devices. Even though 4 g is a successor technology of 3 g, there can be issues signification on 3 g network to upgrade to 4 g as many of them were not built on forward compatibility. Conceivable applications include amended mobile web access, IP telephony, gaming services, mobile TV, high-definition video conferencing, 3D television, and cloud computing. Two 4 g candidate systems are commercially deployed: the Mobile WiMAX standard (first used in South Korea in 2006), and the first-release Long Term Evolution (LTE) standard (in Oslo, Norway and Stockholm, Sweden since 2009). It has however been debated if these first-release versions should be considered to be 4 g or not, as discussed in the technical definition section below. In the United States, Sprint (previously Clear wire) has deployed Mobile WiMAX networks since 2008, and Metro PCS was the first operator to offer LTE service in 2010. USB wireless modems have been available since the start, while WiMAX smart phones have been available since 2010 and LTE smart phones since 2011. Equipment made for different continents is not always compatible, because of different frequency bands. Mobile WiMAX is currently (April 2011) not available for the European market. The two candidate technologies for 4 g are the Advanced Long Term Evolution (LTE Advanced) which is based on the 3GPP standards and the WiMAX IEEE 802.16 based on the 2.0 family of standards. The common feature of both technologies is that they will provide All-IP connectivity with flexible bit rates and quality of service guarantees for multiple classes of Project Report on Wireless 4 g 5services including voice, mainly using voice over IP, data and video services. The two technologies, WiMAX and LTE, are competing while having much in common. Some salient features of are the following: Both are "all-IP", all packet technology with a packet network core which makes it best for burst data traffic with good VoIP support. Both are uses of OFDMA, Orthogonal Frequency Division Multiple Access, a multiple access technology. Other features are the use AMC, Adaptive coding and modulation, HARQ, Hybrid ARQ, technique for error detection and embracing multiple antennas (Higher order MIMO LTE-advanced printing and WiMax 2.0) and resort to femto cells and relay nodes to improve coverage or to further Yahoo.lang performance and data rates
đang được dịch, vui lòng đợi..