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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