1. Computer Science Engineering (CSE)
  2. Communication Engineering
  3. QPSK has                  the bandwidth ...

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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