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CS 350

CS 350. Chapter-12 Wireless Technologies. Wireless Agencies & Standards. Unlicensed Bands. Released by FCC Industrial, Scientific and Medical (ISM) 900MHz 2.4GHz Unlicensed National Information Infrastructure (UNII) 5GHz. The 802.11 Standards.

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CS 350

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  1. CS 350 Chapter-12 Wireless Technologies

  2. Wireless Agencies & Standards

  3. Unlicensed Bands • Released by FCC • Industrial, Scientific and Medical (ISM) • 900MHz • 2.4GHz • Unlicensed National Information Infrastructure (UNII) • 5GHz

  4. The 802.11 Standards • Committees Committee PurposeIEEE 802.11a 54Mbps, 5GHz standardIEEE 802.11b Enhancements to 802.11 to support 5.5Mbps and 11MbpsIEEE 802.11c Bridge operation procedures; included in the IEEE 802.1D standardIEEE 802.11d International roaming extensionsIEEE 802.11e Quality of serviceIEEE 802.11F Inter-Access Point ProtocolIEEE 802.11g 54Mbps, 2.4GHz standard (backward compatible with 802.11b)IEEE 802.11h Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) at 5GHzIEEE 802.11i Enhanced securityIEEE 802.11j Extensions for Japan and U.S. public safetyIEEE 802.11k Radio resource measurement enhancementsIEEE 802.11m Maintenance of the standard; odds and endsIEEE 802.11n Higher throughput improvements using multiple input, multiple output (MIMO) antennasIEEE 802.11p Wireless Access for the Vehicular Environment (WAVE)IEEE 802.11r Fast roamingIEEE 802.11s Extended service set mesh networkingIEEE 802.11T Wireless Performance Prediction (WPP)IEEE 802.11u Internetworking with non-802 networks (cellular, for example)IEEE 802.11v Wireless network managementIEEE 802.11w Protected management framesIEEE 802.11y 3650–3700 operation in the United States

  5. Wireless LAN Modulation Techniques • Direct-Sequence Spread Spectrum (DSSS) • 802.11, 802.11b • Differential Binary Phase Shift Keying (DBPSK) for 1Mbps DSSS • Differential Quadrature Phase Shift Keying (DQPSK) for 2Mbps DSSS • Complementary Code Keying (CCK) for 5.5 Mbps and 11Mbps • The three are compatible and can coexist by 802.11-standard using rate-switching procedure • Error can be corrected by a redundant bit

  6. Wireless LAN Modulation Techniques • Frequency-Hopping Spread Spectrum (FHSS) • No offered by any vendor • Orthogonal Frequency Division Multiplexing (OFDM) • 802.11a/g • 52 carriers • BPSK or QPSK

  7. Wireless Network Components • Wireless Access Points (AP) • Wireless Network Interface Card (NIC) • Wireless Antennas • Omni directional • Directional or Yagi • dBd :7dBd = 7 + 2.2 dBi • dBi

  8. Installing a Wireless Network • Ad hoc Mode: Independent Basic Service Set (IBSS) • Infrastructure Mode: Basic Service Set (BSS) • Security Set Identifier (SSID) – identify a network • Extended Service Set (ESS) - extend coverage than a single access point

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