802.11n
802.11n is a protocol based on the 2.4G frequency band under the OFDM (Orthogonal Frequency Division Multiplexing) technology, and can also work in the 5G frequency band.
-Introduction of MIMO technology
- Supports carrier aggregation technology, that is, 20MHz and 40MHz bandwidth operating modes
-RIFS and short GI and the like
- Support frame aggregation working mode, that is, multiple frames can be aggregated into one frame for transmission at a time, and then the AP only needs to feed back one block ACK, thereby reducing the contention overhead
The improvement of 802.11n to 802.11g: the highest speed is 72Mbps under 20MHz shortGI (GI=400ns) under single MIMO
The highest speed is 144Mbps under 40Hz shortGI (GI=400ns) under single MIMO
The highest speed is 150Mbps under 20MHz shortGI (GI=400ns) under 2x2MIMO
The highest speed is 300Mbps under 40MHz shortGI (GI=400ns) under 2x2MIMO
In the same situation , 2x2MIMO is a little more than double the speed of single MIMO
Under the same circumstances, the bandwidth of 40MHz is twice as fast as that of 20MHz