Wireless Agencies amp Standards Agency Purpose Web Site Institute of Electrical and Electronics Engineers IEEE Creates and maintains operational standards wwwieeeorg Federal Communications Commission FCC ID: 794556
Download The PPT/PDF document "CS 350 Chapter-12 Wireless Technologies" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
CS 350
Chapter-12
Wireless Technologies
Slide2Wireless Agencies & Standards
Agency
Purpose
Web Site
Institute of Electrical
and Electronics Engineers (IEEE)
Creates and maintains operational standards
www.ieee.org
Federal Communications Commission (FCC)
Regulates
the use of wireless devices in the U.S.
www.fcc.gov
European Telecommunications Standards Institute
(
ETSi
)
Chartered to produce common standards in Europe
www.etsi.org
Wi-Fi Alliance
Promotes and tests
for WLAN interoperability
www.wi-fi.com
WLAN Association (WLANA)
Educates and raises consumer awareness regarding WLANS
www.wlana.org
Slide3Unlicensed Bands
Released by FCC
Industrial, Scientific and Medical (ISM)
900MHz
2.4GHz
Unlicensed National Information Infrastructure (UNII)5GHz
Slide4The 802.11 Standards
Committees Committee Purpose
IEEE 802.11a 54Mbps, 5GHz standard
IEEE 802.11b Enhancements to 802.11 to support 5.5Mbps and 11Mbps
IEEE 802.11c Bridge operation procedures; included in the IEEE 802.1D standard
IEEE 802.11d International roaming extensions
IEEE 802.11e Quality of service
IEEE 802.11F Inter-Access Point Protocol
IEEE 802.11g 54Mbps, 2.4GHz standard (backward compatible with 802.11b)
IEEE 802.11h Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) at 5GHz
IEEE 802.11i Enhanced security
IEEE 802.11j Extensions for Japan and U.S. public safety
IEEE 802.11k Radio resource measurement enhancements
IEEE 802.11m Maintenance of the standard; odds and ends
IEEE 802.11n Higher throughput improvements using multiple input, multiple output (MIMO) antennas
IEEE 802.11p Wireless Access for the Vehicular Environment (WAVE)
IEEE 802.11r Fast roaming
IEEE 802.11s Extended service set mesh networking
IEEE 802.11T Wireless Performance Prediction (WPP)
IEEE 802.11u Internetworking with non-802 networks (cellular, for example)
IEEE 802.11v Wireless network management
IEEE 802.11w Protected management frames
IEEE 802.11y 3650–3700 operation in the United States
Slide5Slide6Slide7Wireless 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
Slide8Wireless LAN Modulation Techniques
Frequency-Hopping Spread Spectrum (FHSS)
No offered by any vendor
Orthogonal Frequency Division Multiplexing (OFDM)
802.11a/g
52 carriersBPSK or QPSK
Slide9Wireless Network Components
Wireless Access Points (AP)
Wireless Network Interface Card (NIC)
Wireless Antennas
Omni directional
Directional or YagidBd
:7dBd = 7 + 2.2
dBi
dBi
Slide10Installing 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