System information

 IEEE 802.11n
New Functions Implementation (DWS-4026/DWL-8600AP)
Guard Interval
 Guard Interval is a time period between two transmitted symbols.
 The purpose is to prevent interference in multipath environments. When two
symbols arrive over two different paths, the beginning of a new symbol may
arrive at the receiver before the last symbol is completely received.
arrive at the receiver before the last symbol is completely received.
 The default setting of 802.11a/g/n is 800 nanoseconds.
 802.11n supports short guard interval which shorten the time to 400ns
 It can improve around 10% of performance.
Earlier S
y
mbol 1Earlier S
y
mbol 2
Time line
y
y
Later Symbol
Guard Interval
146
Interference