[Solved] QPSK has the bandwidth efficiency of BPSK.

Q.	QPSK has the bandwidth efficiency of BPSK.
A.	twice
B.	same
C.	half
D.	four times
Answer» A. twice
Explanation: quadrature phase shift keying (qpsk) has twice the bandwidth of bpsk. it is because two bits are transmitted in a single modulation symbol. the phase of the carrier takes on one of the four equally spaced values, where each value of phase corresponds to a unique pair of message bit.

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