Wireless Communications Using RATs HDTV – Over-the-Air High ...

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  • 1. Wireless Communications Using 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? Extendable coverage, handoffs, low power usage of handsets High Mobile Telephone Small coverage area (<100 m), interference, no handoff/hopping Low W-LAN Display bulk, high power needs for large coverage, one way direct broadcast Very Low OTA HDTV Reasons Mobility Technology
  • 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 XMT AV ANT SRC ENC RCV DEC 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)
  • 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 PBS (Syracuse) 536-542 WCNY – DT UPN (Buffalo) 758-764 WNLO – DT WB (Syracuse) 650-656 WNYS – DT ABC 740-746 WOKR – DT NBC 734-740 WHEC – DT CBS 656-662 WROC – DT FOX 554-560 WUHF – DT PBS 482-488 WXXI – DT Network Frequency (Mhz) Call Sign
  • 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 WWW ISP WAP MCD 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 MDM FW RTR 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 Personal LANS 2.4 / 3.1-10.6 Ghz 10 m 55 / 110 Mbps 802.15.3 (future) Sensors Controllers 915 Mhz / 2.4 Ghz 10 m 250 kbps / 40 Mbps 802.14 (ZigBee) Device cable replacement 2.4 Ghz 10 m 1 Mbps 802.15.1 Bluetooth 802.11b compatible 2.4 Ghz 100 m 54 Mbps 802.11g Business and home 5 Ghz 50 m 54 Mbps 802.11a public hotspots 2.4 Ghz 100 m 11 Mbps 802.11b Usage Radio Frequency Max. Indoor Range Max. Speed Standard
  • 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 MSC MTSO HLR PSTN MS BTS/BSC POTS MS 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
  • 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 115 kbps data GPRS, W-CDMA, PTT Voice, Data T-Mobile, AT&T GSM Address public safety concern Spectrum change Voice, Data, PTT Nextel TDMA / iDEN to 3.1 Mbps 1XEV-DV Voice, Data Sprint CDMA / PCS 384 kbps data Edge Voice, Data Cingular / AT&T TDMA / TIA 136 300-500 kbps, to 2.4 Mbps 1XEV-DO CDMA-2000 Voice, Data, PTT, 1xRTT Verizon CDMA / TIA 95 Will Provide What’s Coming Provides Company Access Standard
  • 16. In Appreciation
    • The IEEE Rochester, NY section is pleased to support the efforts of the 2004 E 3 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