lecturers assessmenteestaff.kku.ac.th/~nararat/en253205/ch01introduction.pdf · –leased line 9 by...
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EN253 205 (2/2562)Mobile Communication
Introduction toWireless Communication System
ผู้ช่วยศาสตราจารย์ นรารัตน์ เรืองชัยจตุพรสาขาวชิาวศิวกรรมไฟฟ้า คณะวศิวกรรมศาสตร์
มหาวทิยาลัยขอนแก่นOffice: EN04325A, Email: [email protected]
Lecturers• Asst.Prof. Nararat RUANGCHAIJATUPON
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Assessment
Activities %Score
Midterm Test 40
Final Test 40
Assignment 15
Attendance 5
Introduction
• AT&T, the largest telecom company in the world, the core revenue (early 1980s) was from POTS (plain old telephone service)
• In the year 2000, income from wireless industry surpassed income from wired telephone industry
• Worldwide growth of the fixed, wireless, and Internet communication industries
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Mobile Data Usage is increasing
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http://ibnlive.in.com/news/mobile-internet-usage-in-india-outstrips-traffic-from-desktops-report/308772-11.html
Number of smartphone users (worldwide)
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Source: https://www.statista.com/statistics/330695/number-of-smartphone-users-worldwide/
We use our mobile phones for …1.
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In this course, we will study…
• Wireless medium– characteristic and
radio propagation– modulation techniques– coding
• speech coding• diversity channel coding
– multiplexing technique
• Cellular systems– multiple access– interference
management– capacity of wireless
channels– multiuser capacity– Interconnection
components and standards - 3G, 4G, 5G
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PSTN and its extension to cell phone services
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Backbone Infrastructure (1)• PSTN (Public switch telephone network)
– PBX (Private branch exchange)
– Twisted-pair analog telephone
– 64 kbps
– Leased line
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By Kornelia und Hartmut Häfelehttp://www.pixeleye.com/, CC BY-SA 3.0https://commons.wikimedia.org/w/index.php?curid=29308 How to wire?
Telephone Switching Center
Montreal telephone exchange (c. 1895) Modern Central Office
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By btphotosbduk - BDUK Broadband, CC BY 2.0,https://commons.wikimedia.org/w/index.php?curid=40750142
By Various photographers for Cassell & Co. - The Queen's Empire.Volume 3. Cassell & Co. London, Public Domain,https://commons.wikimedia.org/w/index.php?curid=27532259
Backbone Infrastructure (2)• HFC (Hybrid fiber coax)
– Cable TV– Distributed by tapped from the same cable
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A Map of Undersea Fiber Optic Cables
Source: https://www.thefoa.org/PPT/
Voice vs. Data-Oriented Networks
• Fig. 1.5
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Wireless applications
• Voice-oriented– Low-power, low-
mobility, higher quality of voice
• Cordless telephone• Personal
communication services (PCS)
– High-power, large coverage, high-mobility, lower quality of voice
• Cellular systems
• Data-oriented– Local broadband and
ad hoc networks• WLANs• WPANs• High-speed/ad hoc
– Wide area wireless data service(s)
• Internet• Mobile users
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History of Voice-Oriented Wireless Networks
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Development of Voice-Oriented Wireless Networks
• Mobile radio – FDMA
• Advanced Mobile Phone System (AMPS)
• Digital TDMA
• CDMA– IMT-2000
• Wideband CDMA
• Nordic Mobile Telephone (NMT)
• Global System for Mobile Communication (GSM)
• Rapid growth in developing countries
• CDMA/HSPA/HSPA+
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Development of Voice-Oriented Wireless Networks (cont.)
• Local voice-oriented wireless application– Cordless telephone
• CT-2 : first digital cordless telephone (UK, early 1980s)
• DECT – digital European cordless telephone (with wireless PBX)
• PCS (Personal Communication Service)– PHP (Personal Handy Phone), PHS (Personal
Handy System)
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Development of Data-Oriented Wireless Networks
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Development of Data-Oriented Wireless Networks (cont.)
• Wide area wireless data network– ARDIS
• By Motorola&IBM in 1983
– Mobitex• By Ericson in 1986
– CDPD - AMPS• Cellular digital packet data
– GPRS - GSM• General packet radio
service– 3G– Licensed band
• Local broadband and ad hoc networks– WLANs– HIPERLAN
• High Performance Radio LAN
• European Standard
– WPANs• Bluetooth
– Unlicensed band
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Generations of Wireless Networks
• 1G– Voice-oriented analog cellular & cordless telephone
• 2G– Voice-oriented digital cellular & PCS
– Data-oriented wireless WANs & LANs
• 3G– Unified network, packet-switched data services
– Licensed band
– Unlicensed band (USA)
• 4G19
1st Generation
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1st Generation
• AMPS, TACS, NMT-900
• 25 MHz band/each direction
• 800 & 900 MHz
• In practical – band splitting
• FM– Cell size vs. coverage vs. power
• 1G mobile data service– Paging service, one-way short data message
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2nd Digital Cellular Standards
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2nd Generation
• 800-900 MHz band
• FDD
• GSM & IS-95 use multiple analog channels to form one digital carrier
• The number of users (GSM, IS-54, JDC, CDMA)
• Channel bit rate• Power consumption – 100mW average
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2G Mobile Data Service
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Wireless LANs Standards
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3rd Generation
• International standard
• Integrated service
• Quality of voice
• Network capacity
• Data rate
• W-CDMA/OFDM– HSPA/HSPA+
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3rd Generation
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4th Generation
• Voice/Other 3G Services + Mobile Broadband Internet Access
• Mobile WiMAX (56M/128M) / LTE (50M/100M) / LTE-Advanced (500M/1G)
• OFDM
• Thailand’s NBCT has earmarked 1.8 GHz and 2.3 GHz for 4G. The 1.8 GHz is auctioned. The 2.3 GHz spectrum is currently held by TOT.
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5th Generation
• Data rates of several tens of Mb/s
• Tens of thousands of users.
• 1 Gb/s to be offered, simultaneously to tens of workers on the same office floor.
• Several 100,000's simultaneous connections to be supported for massive sensor deployments.
• Femtocell/Internet-of-Things
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Questions?/Discussion?
Source :https://networkencyclopedia.com/personal-communications-services-pcs/
Source : https://www.gamingdose.com/news/samsung-galaxy-fold