1

1
Wireless CommunicationsUsing RATs

• HDTV Over-the-Air High Definition TV
• W-LAN Local Area Networking
• Personal Mobile Telephone

2
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
  1800s 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

3
Wireless, but how mobile?

4
HDTV Overview

• HDTV is a form of Digital TV (DTV)
• HDTV displays up to 1080 lines at an aspect ratio
  of 169 (widthheight)
• DTV below 720 lines is either Enhanced (EDTV) or
  Standard (SDTV) at an aspect ratio of 43
• An HDTV receiver and a high definition display
  are needed to view OTA HDTV

5
DTV OTA Reference Diagram
DEC
SRC
ENC
RCV
ANT
XMT
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)
AV
6
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

7
Local DTV Broadcast Channels
8
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

9
Wireless LAN Reference Diagram
WAP
MCD
WWW
ISP
MDM
FW
RTR
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
WD
HS
10
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)

11
IEEE W-LAN Standards
12
Mobile Telephony Overview

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

13
Mobile Telephone Reference Diagram
VLR
PSTN
MSC MTSO
MS
POTS
BTS/BSC
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
HLR
BTS/BSC
MS
14
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

15
Mobile Telephony Standards
16
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