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CS 350 Chapter-12 Wireless Technologies. Wireless Agencies & Standards AgencyPurposeWeb Site Institute of Electrical and Electronics Engineers (IEEE)

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Presentation on theme: "CS 350 Chapter-12 Wireless Technologies. Wireless Agencies & Standards AgencyPurposeWeb Site Institute of Electrical and Electronics Engineers (IEEE)"— Presentation transcript:

1 CS 350 Chapter-12 Wireless Technologies

2 Wireless Agencies & Standards AgencyPurposeWeb Site Institute of Electrical and Electronics Engineers (IEEE) Creates and maintains operational standards Federal Communications Commission (FCC) Regulates the use of wireless devices in the U.S. European Telecommunications Standards Institute (ETSi) Chartered to produce common standards in Europe Wi-Fi AlliancePromotes and tests for WLAN interoperability WLAN Association (WLANA) Educates and raises consumer awareness regarding WLANS

3 Unlicensed Bands Released by FCC Industrial, Scientific and Medical (ISM) 900MHz2.4GHz Unlicensed National Information Infrastructure (UNII) 5GHz

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

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7 Wireless LAN Modulation Techniques Direct-Sequence Spread Spectrum (DSSS) , b 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 standard using rate-switching procedure Error can be corrected by a redundant bit

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

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

10 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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