What is the guard interval and what does it help prevent?
What will be an ideal response?
In non-HT transmissions (compatible with 802.11a/g), because of multipath, a certain amount of delay is required at the end of every frame to allow all reflected signals to arrive at the receivers. This is called a guard interval (GI), and it prevents a new symbol from arriving at the receiver before the last multipath signal reaches the receiver's antenna, which can cause data corruption. This kind of data corruption is called intersymbol interference (ISI).
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What will be an ideal response?
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