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Wireless Communications - PowerPoint PPT Presentation

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Wireless Communications Using RATs. HDTV – Over-the-Air High Definition TV W-LAN – Local Area Networking Personal – Mobile Telephone. Not your average radio…. HDTV, W-LAN and Mobile Telephony are all a form of Radio Access Technology (RAT)

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Wireless CommunicationsUsing RATs

HDTV – Over-the-Air High Definition TV

W-LAN – Local Area Networking

Personal – Mobile Telephone

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Not your average radio….

  • HDTV, W-LAN and Mobile Telephony are all a form of Radio Access Technology (RAT)

  • Radio communications was invented in the late 1800’s by Marconi and Tesla

  • Radio is wave energy that is transmitted & received through the air at frequencies that are not visible or audible by humans

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HDTV Overview

  • HDTV is a form of Digital TV (DTV)

  • HDTV displays up to 1080 lines at an aspect ratio of 16:9 (width:height)

  • DTV below 720 lines is either Enhanced (EDTV) or Standard (SDTV) at an aspect ratio of 4:3

  • An HDTV receiver and a high definition display are needed to view OTA HDTV

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DTV OTA Reference Diagram







SRC: source (studio, network feeds, remotes, metadata)

ENC: MPEG2 encoder

XMT: transmitter

ANT: antenna

RCV: receiver

DEC: MPEG2 decoder

AV: Audio/Visual (AC3 Dolby Sound, Program Guides, Programming)


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DTV & HDTV Benefits

  • DTV broadcasts streams may contain multiple channels of video, audio and data components- digitally compressed (MPEG2)

  • Audio is presented in Dolby Digital Surround Sound (5.1)

  • HDTV Video is almost 10 times higher in resolution than conventional TV

  • Video formats more closely approximate those of theatrical movies

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W-LAN Overview

  • W-LAN, 802.11 and WiFi are all names for wireless networking

  • Networking allows computing devices to communicate with each other and to share resources and workloads

  • Radio devices are used to replace wires in W-LANs

  • Wireless Access Points allow computing devices with wireless Adapter Cards to connect to WWW hosts, local hosts or peripherals on the net

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Wireless LAN Reference Diagram








WWW: World Wide Web

ISP: Internet Service Provider

MDM: Modem (cable, DSL, Dial Up)

FW: Fire Wall

RTR: Router

WAP: Wireless Access Point

HS: Hot Spot

MCD: Mobile Computing Device

WD: Wired Device



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W-LAN Benefits

  • Wireless networks give the ability to work and share computers from anywhere

  • W-LANS are implemented with standards that describe how they should behave

  • Standards allow interoperability between brands and lower costs

  • Cheaper communication devices allow for community networks (eg. Café Hotspots)

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Mobile Telephony Overview

  • The first generation of wireless telephony began as cellular service in the 1960’s

  • We are now somewhere between the second (2G) and third (3G) generations

  • There are multiple standards/providers of service in the USA and across the world

  • There is little interoperability in handsets, but hand-off systems allow calls to move among the different wireless and wireline networks

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Mobile Telephone Reference Diagram








MS: mobile subscriber

BTS: base terminal station

BSC: base station controller

MSC: mobile switching center

MTSO: mobile telephone switching office

HLR: home location register

VLR: visitor location register

PSTN: public switched telephone network

POTS: plain old telephone service




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Mobile Telephony Benefits

  • Very high mobility and connectivity (one-to -many and many-to-many)

  • Competitive market place – many vendors offering packages which promote cost-savings, reliability, coverage and user features

  • Handsets are multi-functional – voice, data, video capture, email, contacts, reminders, games, caller ID, speaker phone, PTT, MP3/ACC players, blue tooth, voice recognition, video messaging

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In Appreciation

  • The IEEE Rochester, NY section is pleased to support the efforts of the 2004 E3 Fair.

  • Our thanks to our visitors and the local businesses that helped with our demonstrations – Belkin Components, Verizon Wireless and WXXI / PBS.

  • Visit the IEEE website at -

  • http://www.r1.ieee.org/~roch/

  • Joseph DeVita, IEEE Rochester, NY PACE Chair