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The delayed path is equivalent to the cyclic shift of the direct (first) path because the guard interval in the form of CP is appended in front of each OFDM block.
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This is because the loss due to the guard interval decreases by increasing the block length K.
This chirp periodicity is very important because it will be used in the guard interval (GI).
The parameter Δ represents the guard interval fraction.
Let denote the OFDM symbol duration and the guard interval.
An OFDMA system with subcarriers is considered the guard interval.
The guard interval length is L gi = 3.
where GI is the guard interval in two consecutive symbols.
∆ is the duration of the time interval called the guard interval.
First, by perfect provision of the guard interval, the maximum delay spread is not greater than the guard interval length, i.e., (t_{q,N_{mathrm {P}}~-~1}~-~t_{q,0}~leq ~t_{g}thrm {g}}), where t g is the guard interval length.
If CP is used as guard interval at the transmitter, the receiver must remove the guard interval from the received signal to eliminate IBI.
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