This gives a nice overview of the differences between Ethernet and Wifi at a protocol level.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.456.9874&rep=rep1&type=pdf
- The crux of the problem is this : “The CSMA/CD protocol is not used in a wireless environment due to the user has no capability to sense/listen to the channel for collision while sending the packet [12].“
- This necessitates things like Collision Avoidance techniques to be used for Wifi. And that imposes limits on how fast you can transmit packets at a certain frequency band leading to slower speeds.
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