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1、Wireless Communications Principles（bilingual course） (No:B0205061S )Lecture 1: Introduction to Wireless Communications (Feb ,2014-Apr.2014)Date1Course Information 32 class hours in all Examination paper is in English Reference books: 1)Theodore S. Rappaport. Wireless Communications Principles and P
2、ractice (2nd Edition).电子工业出版社，2009年版 2)Theodore S. Rappaport著， 周文安等译. 无线 通信原理与应用.电子工业出版社，2011年版3 ) 张业荣，竺南直，陈勇蜂窝移动通信网络规 划与优化北京:电子工业出版社，2003 Date2Main contents in the course within 32 hours Introduction to Wireless Communications (ch.1,ch.2,selected ch11) The Cellular Concept: System Design Fundamenta
3、ls(ch.3) Mobile Radio Propagation: Large-Scale Path Loss(ch.4) Mobile Radio Propagation: Small-Scale Fading and Multipath (ch.5) Multiple Access Techniques for Wireless Communications (ch.9) Wireless Networking (ch.10, selected)Date3 Wireless communication : the transfer of information over a distan
4、ce without the use of electrical conductors or “wires“. Communication via computers that relies on radio signalsThe equation related to the speed of light：The speed of light ; carrier frequency ; wavelength ;1.1 A definition of wireless communicationDate4Cell phones operate in this frequency range,
5、UHF = Ultra High Frequency (note the logarithmic scale, generally near 2GHz)Cellular Network Basics: Frequency RangeDate5General Research Areas:Cellular Systems (wireless wide area networks or WWANs)Satellite Systems (skip)wireless local area networks (WLANs)wireless metropolitan area networks (WMAN
6、s)Wireless Personal Area Networks(WPANs)1.2Current Wireless SystemsDate6Classification of wireless networks （Referred to Kaustubh Phases, UPPSALA Uni.）Date7Emerging Research Areas and TechniquesEmerging AreasWireless Sensor Networks 3G and beyond 3.9G (LTE), 4G,et alWireless Key techniques OFDM, and
7、 Multi-carrier MIMO(Multi-Input Multi-Output ) Cognitive and Software Defined Radio, IEEE 802.22(proposed), et alCoverage (range) Area, The output of Wireless System Modeling and Design: International standard (IP): 802.11,802.16,GSM Date8*All IP basedDate9Wireless Communications System Definitions
8、(pp:10)Base Station Control channel : initiating, requesting,or paging a call Forward channel: from BS to the mobile (also Subscriber) Reverse channel: from the mobile to BS Half-duplex systems allowing two-way communication by using the same radio channel Full-duplex systems allowing simultaneous t
9、wo-way communication. Handoff Mobile station MSC: Mobile Switching Center Simplex system and et al.Date10The big breakthrough came when AT typically interconnecting several WMANs and providing anywhere, anytime accessIt is useful to think of cellular Network/telephony in terms of generations: 1G: An
10、alog cellular telephony; 2G: Digital cellular telephony ; 3G: High-speed digital cellular telephony (including video telephony); 4G First generation (1G) of cellular NetworksAnalog cellular systems(FM)Only carry voice trafficLess secure and prone to interference when signal is weak Include standards
11、 such as : AMPS 30KHz FM FDMA1.3 Mobile communication networks Date13The 2nd generation of mobile technology Or 2G Cellular NetworksGSM was the most applied technology of Cellular networksDigital cellular systems can Support high bit rate voice, limited data communication Improve quality of service2
12、G standards include :GSM 200KHz GMSK TDMA (By far the dominant one in china)IS-95 1.23MHz , CDMA , signal bandwidth of a single channel is 1.28MHzDate143G Offers enhancements to current applications including greater data speeds, increased capacity for voice and data and a broader range of services.
13、In 2000, ITU approved the following three standards:cdma2000 WCDMA TD-SCDMA In addition, WIMAX (OFDM/OFDMA) was included in 2007. Highest data rate of 3G is as following at least 144 Kb/s in a vehicular environment, 384 Kb/s in a pedestrian environment, 2048 Kb/s in an indoor office environment.3G (
14、The 3rd generation wireless network) Date15WLANs connect “local” computers (100m range)Breaks data into packetsChannel access is shared (random access)Backbone Internet provides best-effort serviceISM bandsWireless LAN Standards:Wi-Fi 802.11b, 802.11a, 802.11g1.4Wireless Local Area Networks (WLANs)D
15、ate16WLAN InfrastructureNetwork between devices in home and office environment; Typically gives access to a fixed infrastructureDate17802.15.1 BluetoothlCable replacement RF technology (low cost)lShort range (10m, extendable to 100m)l2.4 GHz band (crowded)l1 Data (700 Kbps) and 3 voice channelslWide
16、ly supported by telecommunications, PC, and consumer electronics companiesWPANs include Bluetooth, ZigBee, Ultra-wideband (UWB), etc. 802.15.3 Ultra Wideband Radio (UWB)WPANs: Wireless Personal Area Networks 1.5WPANs and WMANs Date18Wireless Personal Area Networks (WPANs) are ad hoc networks. “removing the wire”Ad Hoc Mode may not require
