S

Shiva Ram • 30.44K Points
Instructor I 

Q. Preamble is used for

(A) detect start of transmission
(B) to set automatic gain control
(C) to align internal clocks
(D) all of the mentioned
Correct : Option (D)

Explanation: 
 the receiver uses preamble for detecting the start of transmission, to set automatic gain control, and to align internal clocks and local oscillator with the received signal.

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