Article | REF: TE7376 V1

Evolution of the IEEE 802.11 standard for wireless networks

Author: Isabelle GUÉRIN LASSOUS

Publication date: October 10, 2009

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2. Main IEEE 802.11 amendments

Some amendments were strongly supported by manufacturers of wireless cards and access points. These include amendments b, a and g. The most popular wireless cards sold in France are probably 802.11b/g cards.

2.1 IEEE 802.11b: towards 11 Mbit/s throughput

This amendment was published at the end of 1999. It proposes an extension to one of the physical layers defined in the IEEE 802.11-1999 standard in the 2.4 GHz frequency band. The extension, called HR/DSSS (High Rate Direct Spread Sequence Spectrum), is defined for the DSSS physical layer proposed in 802.11-1999. This extension uses a coding scheme that results in physical data rates of 5.5 and 11 Mbit/s. This physical layer uses the same physical preamble and header. This enables interoperability with the...

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Main IEEE 802.11 amendments