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IEEE 802.11 a/g

IEEE 802.11 a/g. Wireless LAN mit 54 Mb/s Andi Hotz. Übersicht. IEEE 802.11 Übersicht IEEE 802.11 b versus IEEE 802.11 a/g IEEE 802.11 b/g Gemischter Betrieb Orthogonal Frequency Division Multiplex Packetformat IEEE 802.11 Demo Ausblick. IEEE 802.11 Übersicht.

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IEEE 802.11 a/g

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  1. IEEE 802.11 a/g Wireless LAN mit 54 Mb/s Andi Hotz

  2. Übersicht • IEEE 802.11 Übersicht • IEEE 802.11 b versus IEEE 802.11 a/g • IEEE 802.11 b/g Gemischter Betrieb • Orthogonal Frequency Division Multiplex • Packetformat IEEE 802.11 • Demo • Ausblick

  3. IEEE 802.11 Übersicht

  4. IEEE 802.11 b vs. IEEE 802.11 a/g

  5. Gemischter Betrieb b/g

  6. Orthogonal Frequency Division Multiplex • Othogonalisieren • Dichtere Signaldichte (vgl. FDM) • Aufteilung in viele Signale • FFT und IFFT

  7. OFDM vs. FDM

  8. Packetformat Header

  9. Demo • Anteil Nutzdaten • MulticastServer Temp_Alle/Breiband Netze/WLAN Vortrag/Multicast.zip • Pktdump under Cygwin (WinPcap) • Packetyzer

  10. Ausblick • 802.11 h • erhöhte Sendeleistung • Transmit Power Control • Dynamic Frequency Selection • 802.11 a im Turbo Mode • Chipsatz AR5001X • Brutto Übertragungsrate 108 Mb/s • Netto Übertragungsrate 90 Mb/s • 802.11 a- • Brutto Übertragungsrate 162 Mb/s • Chip von Agere

  11. Quellen • c‘t 18/03: Vorfahrt für die Schnellen p. 208 ff. • IEEE 802.11: Die Standardkomponenten (http://www.tecchannel.de/hardware/1129/0.html) • IEEE 802.11 a Standard (http://standards.ieee.org/getieee802/download/802.11a-1999.pdf) • IEEE 802.11 g Standard (http://standards.ieee.org/getieee802/download/802.11g-2003.pdf) • 802.11 Wireless Networks The definitve Guide (M.S. Gast) • Universität Kaiserslautern (http://nt.eit.uni-kl.de/wavelet/ofdm.html) • WinPcap Library (http://winpcap.polito.it/)

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