Let’s gain an in-depth understanding of IEEE802.11a in the WIFI protocol, which is the first protocol for the 5G frequency band.
1) Protocol Interpretation: IEEE 802.11a is a revised standard of the original 802.11 standard and was approved in 1999. The core protocol of the 802.11a standard adopts the same as the original standard, but it operates at a frequency of 5GHz, uses 52 orthogonal frequency division multiplexing subcarriers, and has a maximum raw data transmission rate of 54Mb/s, which in turn meets the medium throughput (20Mb/s) requirement of real networks. Of course, if necessary, its data rate can be reduced to 48Mb/s, 36Mb/s, 24Mb/s, 18Mb/s, 12Mb/s, 9Mb/s or 6Mb/s. 802.11a has 12 non-overlapping channels, of which 8 are for indoor use and the other 4 are for point-to-point transmission. It cannot interoperate with 802.11b unless a device that adopts both standards is used.
2) Advantages and disadvantages: As it was mainly used in the 2.4G frequency band at that time, it became increasingly crowded. Therefore, the use of the 5G frequency band was an important improvement over 802.11a, as 802.11a had fewer conflicts. However, high carrier frequencies also bring negative effects. The transmission distance is inferior to 802.11b/g. Theoretically, 5G signals are also more easily blocked and absorbed by walls, making them suitable for use in straight and unobstructed transmission. This leads to the need for more access points. So the coverage of 802.11a is not as good as that of 801.11b. 802.11a is also subject to interference and its wavelength is absorbed by nearby media, causing its signal to gradually weaken more significantly than 2.4GHZ. However, since there are not many nearby interference signals, 802.11a usually has a better throughput.
The above is the knowledge point about IEEE802.11a, its protocol, advantages and disadvantages.
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