What is IEEE 802.11g? - Explained


IEEE 802.11g is the version released in 2003 as an amendment 802.11 legacy specification released by IEEE.


Technology

Major advancement which occurred in the 802.11g wireless network is to burst at a theoritical speed of 54Mbit/s by using the same frequency 2.4GHz band which used in the 802.11b wireless network.

What make the 802.11g improved from the 802.11b is that the 802.11g uses a third modulation standard for wireless Local Area Networks. By using the CSMA/CA transmission scheme 802.11g was able to achieve only a maximum speed of 31.4Mbit/s for the packets sized of 1500 bytes. The smaller sized packets below 1500bytes given a rate of lower transfer speed due to the duty cycle efficiency.

802.11g is capable of working with the previous 802.11b hardware devices which means the 802.g is backward compatible with the 802.11b.


Illustration showcasing the 2.4GHz frequency Bands. Image by Internet.
Illustration showcasing the 2.4GHz frequency Bands. Image by Internet.

Below table showcase the usage of MSC index with modulation types which used in the 802.11g wireless networks and the hardware devices introduced to the world.

MCS IndexRATE bitsModulation TypeCoding RateData Rate in Mbit/s
131,101BPSK1/26
151,111BPSK3/49
5101QPSK1/212
7111QPSK3/418
91,00116-QAM1/224
111,01116-QAM3/436
11164-QAM2/348
31164-QAM3/454

For the marketing purposes and product development, the IEEE 802.11g was branded as WiFi by the WiFi Alliance and enable the hardware manufactures to build products upon the wireless network standards.