11g: The Extended-Rate PHY (ERP)

g The Extended Rate PHY (ERP)

When wireless LANs first entered the mainstream computing consciousness, there was one practical choice. 802.11b had recently been standardized, and offered the prospect of near-Ethernet speed, which, to be fair, by that point was not very fast at all. As 802.11a emerged from the laboratory into commercially-available chipsets, users had a desire to obtain higher speeds than 802.11b, while retaining backwards compatibility with the installed base of 802.11b hardware. The result is 802.11g, which offers a headline bit rate comparable to 802.11a while still operating in the microwave band. By working at slightly less than half the frequency, 802.11g devices have better range than the 5 GHz 802.11a devices.

802.11g is not a revolutionary specification. In fact, if you read the new clauses added by the specification, it is clear that it uses much of the existing work done elsewhere. The new physical layers it specifies are built on existing work, and there are only slight modifications. Most of 802.11g is occupied with providing backwards compatibility.

Introduction to Wireless Networking

Overview of 802.11 Networks

11 MAC Fundamentals

11 Framing in Detail

Wired Equivalent Privacy (WEP)

User Authentication with 802.1X

11i: Robust Security Networks, TKIP, and CCMP

Management Operations

Contention-Free Service with the PCF

Physical Layer Overview

The Frequency-Hopping (FH) PHY

The Direct Sequence PHYs: DSSS and HR/DSSS (802.11b)

11a and 802.11j: 5-GHz OFDM PHY

11g: The Extended-Rate PHY (ERP)

A Peek Ahead at 802.11n: MIMO-OFDM

11 Hardware

Using 802.11 on Windows

11 on the Macintosh

Using 802.11 on Linux

Using 802.11 Access Points

Logical Wireless Network Architecture

Security Architecture

Site Planning and Project Management

11 Network Analysis

11 Performance Tuning

Conclusions and Predictions

802.11 Wireless Networks The Definitive Guide
802.11 Wireless Networks: The Definitive Guide, Second Edition
ISBN: 0596100523
EAN: 2147483647
Year: 2003
Pages: 179
Authors: Matthew Gast

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