What does the Guard Interval in the router mean?

Guard Interval, referred to as GI, is an improvement made by 802.11n to 802.11a/g. When the radio frequency chip uses OFDM modulation to send data, the entire frame is divided into different data blocks for transmission. For the reliability of data transmission, there will be GI between the data blocks to ensure that the receiving side can correctly parse the data. individual data blocks.

Wireless signal transmission in space will cause delays on the receiving side due to multipath and other factors. If subsequent data blocks are sent too fast, they will interfere with the previous data block, and GI is used to avoid this interference. .

The GI duration of 11a/g is 800us, while the Short GI duration is 400us. When using Short GI, the rate can be increased by 10%. In addition, Short GI has nothing to do with bandwidth and supports 20MHz and 40MHz bandwidth.

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