Transcription of IEEE 802.11 Wireless LANs - University of California, Berkeley
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IEEE 802.11 Wireless LANs - University of California, Berkeley
Unit 11 IEEE Wireless LANsShyam ParekhShyam ParekhShyam ParekhShyam ParekhIEEE Wireless LANs References Standards Basics Physical Layer MAC Framing Details Management PCF QoS ( ) Security Take Away PointsTOC Wireless Networks: The Definitive Guide, M. Gast, O Reilly, 2002* ANSI/IEEE Std , 1999 Edition ANSI/IEEE Std ANSI/IEEE Std *Most drawings used in the lectures are from this bookTOC ReferencesIEEE 802 Standards & OSI Model Observe MAC is common to all Physical Layer (PHY) standards PHY is split into Physical Layer Convergence Procedure (PLCP) and Physical Medium Dependent (PMD) sublayersTOC StandardsRelated Standards Bluetooth Originally intended for interconnecting computing and communication devices HIPERLAN European standard for Wireless LANs IEEE Broadband Wireless Addresses needs of fixed and mobile broadband Wireless access replacing fibers, cables, Standards and GHz11 GHz54 GHz54 GHz2 ( )Max RateKey Standards GHz for all above except (referred to as C-Band Industrial, Scientific, and Medical (ISM))
802.11a: 5 GHz OFDM PHY Fundamental Orthogonal Frequency Division Multiplexing (OFDM) work was done in 1960s, and a patent was issued in 1970 Basic idea is to use number of subchannels in parallel for higher throughput Issues with 802.11a Denser Access Point deployment needed due to higher path loss Higher power need
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