some questions about 802.11

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One:
As far as i know, signal in 5GHz decreases faster than in 2.4GHz,why?

Two:
802.11a, 802.11b ,802.11g's data rate decreases as the distance increase ,why? there exits some relationship?

Three:
throughput and data rate,their relationship?

Four:
What is 54g , and 802.11g?
 

Path loss depends by frequency. Higher the frequency, higher the loss.
**broken link removed**
Here you can find the relation for WLAN between Signal field and Data rate
**broken link removed**
 


The relationship between data rate and throughput depends on the overhead (preamble, error coding etc. ) of your protocol.
 

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