As far as I know, 802.11b and 802.11g operate on same frequency 2.4 GHz. But why does 802.11g achieve faster connection than 802.11b?

What's the mechanism of how 802.11g can achieve it?

1 Answer 1


802.11g has a higher bitrate (54mbs, realisitc 22-26mbs). 802.11g uses the same radio-frequency bandwidth as 802.11b, but 802.11g implements QAM / modulation. So a 64-QAM modulation increases the bitrate to 54mbs theoretical speed. It's basically the accuracy of the wlan. How accuratly you can transmit/modulate your signal and how accuratly the client can receive and process the signal.

  • I tried to clarify what you're saying; however, the part about accuracy of the wlan is still a bit unclear. Could you elaborate? Aug 27, 2014 at 9:55
  • Thanks for the edit. Accuracy is how effectivly sender and receiver can send and receive QAM. You can send a highly modulated signal, but if you cannot receive it, it is no good. So when referring to accuracy I'm reffering to the amount of QAM, "how much I can get in one slot". More QAM = More potential bw: QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single channel, thereby doubling the effective bandwidth.-> searchnetworking.techtarget.com/definition/QAM
    – Max
    Aug 27, 2014 at 15:46

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