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

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

(a) Twice

(b) Half

(c) Same

(d) Four times

I got this question in an interview.

Asked question is from Linear Modulation Techniques in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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Best answer
Right option is (c) Same

The explanation is: 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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