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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 communications using rats

Wireless CommunicationsUsing RATs

HDTV – Over-the-Air High Definition TV

W-LAN – Local Area Networking

Personal – Mobile Telephone

not your average radio
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
hdtv overview
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
dtv ota reference diagram
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)


dtv hdtv benefits
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
w lan overview
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
wireless lan reference diagram
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



w lan benefits
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)
mobile telephony overview
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
mobile telephone reference diagram
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




mobile telephony benefits
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
in appreciation
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