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Wireless Communications Using RATs

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

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  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 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

  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 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

  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 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

  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

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