Introduction to Digital Communication Dept of Electrical Eng

Introduction to Digital Communication Dept. of Electrical Eng. University of Shahreza ﺩﻳﺠﻴﺘﺎﻝ – ﻣﺨﺎﺑﺮﺍﺕ ﺑﺮﻕ ﻣﻬﻨﺪﺳﻲ ﺑﺎ آﺸﻨﺎﻳﻲ

Outline 1 - Analog and Digital Signal 2 - Analog and Digital Communication 3 - Communication Media ( )ﻣﺤﻴﻂ ﺍﻧﺘﺸﺎﺭ 4 - Digital Communication Networks 5 - Digital Communication Applications 5 -1 - Indoor Home/Office Communications 5 -2 - Access 5 -3 - Telecommunications 5 -4 - Broadcast 5 -5 - Backbone Communications 2

Time آﻨﺎﻟﻮگ ﺳﻴگﻨﺎﻝ Voltage (sound intensity) 1 - Analog and Digital Signal Time ﺩﻳﺠﻴﺘﺎﻝ ﺳﻴگﻨﺎﻝ 3

3 - Communication Media ( ﺍﻧﺘﺸﺎﺭ )ﻣﺤﻴﻂ Wireless channel Wire line (Twisted pair, Cable, Power line, …) Fiber 7

Wireless Communication 8

Wireless ﺑﻪ ﻧﻴﺎﺯ ﻋﻤﻮﻣﻲ ﻫﺎﻱ ﻛﺎﺭﺑﺮﺩ ﺑﺮﺍﻱ آﺰﺍﺩ ﻓﺮﻛﺎﻧﺴﻲ ﺑﺎﻧﺪ ﺩﺳﺘﻪ ﺩﻭ . ﻧﺪﺍﺭﻧﺪ ﺍﺳﺘﻔﺎﺩﻩ ﻣﺠﻮﺯ ISM: Industrial, Scientific & Medical Band UNII: Unlicensed National Information UNII ISM Infrastructure band ISM 1 2 3 4 5 GHz 10

Wire Line Communication Twisted Pair Telephones connected by twisted pair Category 3: 3 or 4 twists per foot, (16 Mbps) Category 5: 3 to 4 twists per inch (100 Mbps) 11

Coaxial Cable Fiber Optics Power Line 12

4 - Digital Communication Networks Wide Area Network (WAN) l Metropolitan Area Network (MAN) l Local Area Network (LAN) l Personal Area Network (PAN) l Body Area Network (BAN) l 13

Digital Communication Networks BAN 1 m LAN 802. 15. x 802. 11 100 m 10 m PAN MAN 802. 16 2 -6 km WAN 2 G, 3 G 2 km/link national areas 14

5 - Digital Communication Applications 5 - 1 - Indoor Home/Office Communications ﻛﺎﺭ ﻣﺤﻞ ﻳﺎ ﺧﺎﻧﻪ ﺳﺎﺧﺘﻤﺎﻥ ﺩﺭﻭﻥ ﺍﺳﺘﻔﺎﺩﻩ ﻣﻮﺭﺩ ﻫﺎﻱ ﺷﺒﻜﻪ ﻣﺨﺎﺑﺮﺍﺕ Wireless Wi. Fi: Hiper. LAN: Bluetooth: UWB: WLAN based on 802. 11 standard European standard similar to Wi. Fi Short-range communications technology for 1 -3 Mbps Creates Wireless PAN based on IEEE 802. 15 standard Zig. Bee: Low power Home automation PAN nwetwork Twisted pair line Ethernet: USB: Fire Wire: Home. PNA: 10 Base-T, 1000 Base-T, 10 G and 100 G ethernet Universal Serial Bus can send 12 -480 Mbps serially Based on IEEE 1394 allows 400 -1600 Mbps serially For networking over phone line (This is NOT DSL !) Power line Home. Plug: X 10: Standard for communicating up to 200 Mbps over powerline An old method for sending 50 -60 bits per second 15

Home/Office Network analog X. 10 Phone line Access Network + service provider + Internet 10 B-T 1394 Power line 16

Harald Bluetooth ancient King of Denmark Version Data Rate Version 1. 2 1 Mbit/s Version 2. 0 + EDR 3 Mbit/s Can link up to 8 devices in 10 -m area 17

5 - Digital Communication Applications 5 - 2 - Access Wireless Oldest access technology with 56 Kbps A revolutionary method to use phone line for up to 24 Mbps BPL or PLC: Broadband Powerline Standard, or Powerline Carrier Cable Dial up modem: ADSL: Power line WLAN for outdoor networking Provides one or two way internet access (300 -500 Kbps) Twisted pair Wi. Max: Satellite: ﺍﻳﻨﺘﺮﻧﺖ ﺷﺒﻜﻪ ﺑﻪ ﺩﺳﺘﻴﺎﺑﻲ ﻣﺨﺎﺑﺮﺍﺕ DOCSIS: Sending up to 55 Mbps per TV channel over coax cable Fiber FTTH: Fiber To The Home offers speed of 10 Gbps and higher 19

5 - Digital Communication Applications 5 - 3 - Telecommunications ﺗﻠﻔﻨﻲ ﻣﺨﺎﺑﺮﺍﺕ Wireless Mobile GSM (2 G): EDGE (3 G) UMTS (3 G) LTE (4 G) ﺍﻳﺮﺍﻥ ﺩﺭ ﺭﺍﻳﺞ ﻣﻮﺑﺎﻳﻞ ﻫﺎﻱ ﺗﻠﻔﻦ Twisted pair PSTN (Public Switched Telephone Network) ﺳﻴﺴﺘﻢ ﻫﻤﺎﻥ ﻋﺎﺩﻱ ﺗﻠﻔﻦ 22

5 - Digital Communication Applications 5 - 5 Backbone Communications Fiber Telecom Backbone ﺍﻟﻤﻠﻠﻲ ﺑﻴﻦ ﻣﺨﺎﺑﺮﺍﺕ ﺳﺎﺧﺖ ﺯﻳﺮ ﺳﻴﺴﺘﻢ 24