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Praveen Singh • 36.81K Points
Coach 

Q. Power efficiency of M-ary FSK increases, since

(A) constellation is densely packed
(B) m signals are non-orthogonal
(C) fixed null bandwidth
(D) m-signals are orthogonal
Correct : Option (D)

Explanation: 
 in m-ary fsk, all the m signals are orthogonal and there is no crowding in the signal space. hence, power efficiency of m- ary fsk increases with m.

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