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Gopal Sharma • 38.32K Points
Coach 

Q. QPSK provides twice the bandwidth efficiency and                energy efficiency as compared to BPSK.

(A) twice
(B) half
(C) same
(D) four times
Correct : Option (C)

Explanation: 
 the bit error probability of qpsk is identical to bpsk but twice as much data can be sent in the same bandwidth. thus, when compared to bpsk, qpsk provides twice the spectral efficiency with exactly the same efficiency.

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