Wireless LANs


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Table of Contents

Wireless LANs

Overview

Mobile vs Wireless

CDMA

Frequency Hopping Spread Spectrum

Spectrum

Slow Frequency Hop Spread Spectrum

Fast Frequency Hop Spread Spectrum

Direct-Sequence Spread Spectrum

DS Spectrum

Code Division Multiple Access (CDMA)

CDMA Example

CDMA Encoding and Decoding

OFDM

Wireless LAN Requirements

Wireless LANs

Infrared LANs

IEEE 802.11 Features

Hidden Node Problem

4-Way Handshake

IEEE 802.11 MAC

Peer-to-Peer or Base Stations?

IEEE 802.11 Architecture

Architecture

IEEE 802.11 Priorities

Time Critical Services

Power Management

Frame Format

MAC Frame Fields

802.11 Address Fields

Station Location

IEEE 802.11 Phy

Why 2.4 GHz?

FHSS Phy

DSSS Phy

Infrared Phy

802.11 Physical Layers

IEEE 802.11 Protocol Architecture

802.11a

802.11b

802.11g

Summary

Reading Assignment

Homework

Author: Raj Jain

Home Page: http://www1.cse.wustl.edu/~jain/

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