802.11g standard is standard for 3rd WiFi generation. Read more about the standard here.
The General Specifications of 802.11g
802.11g, the third generation of the WiFi also called IEEE 802.11g-2003, was released in June 2003. It is working on the frequency of 2.4 GHz and it has the speed up to 54 Mbps. 802.11g WiFi devices are compatible with the devices of the 802.11b standard.
The Modulation of 802.11g and Compatibility with 802.11ab
Standard uses OFDM – Orthogonal Frequency-Division Multiplexing. It can work on the following speeds: 54, 48, 36, 24, 18, 12, 9 and 6 Mbps. At the speeds of 11 and 5.5 Mbps it uses CCK and DSSS (like 802.11b). This enables compatibility with 802.11b.
The Advantages of the Third WiFi Generation
The 802.11g has inherited all the best feature from the previous standards:
- Bigger range – from 802.11b
- Lower cost – from 802.11b
- Speed of 54 Mbps – from 802.11a.
The Channels of the Amendment
802.11g has fourteen channels – the same as 802.11b. There are different allowed powers in different regions of the word. The most restricted is Japan, because they allow maximum power of 30 mW. In Europe the threshold is 50 mW, while in the Americas the maximum allowed power is 100 mW. The value of central frequency is the same as for 802.11b.
802.11g vs 802.11b
If you compare the 802.11g with the 802.11b, you will notice the following similarities:
- Frequency band gap
- Modulation for speeds of 11 and 5.5 Mbps.
These similarities enable the compatibility between the standards. They have different basic modulation. The basic modulation, in which 802.11g works, is OFDM. This is the modulation on which standard usually works. The speeds during the basic modulation are 54, 48, 36, 24, 18, 12, 9 and 6 Mbps.
More about this you could read on IEEE 802.11g-2003.