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QPSK has ________ the bandwidth efficiency of BPSK.

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QPSK has ________ the bandwidth efficiency of BPSK.

(a) Twice

(b) Same

(c) Half

(d) Four times

I had been asked this question by my school principal while I was bunking the class.

My enquiry is from Linear Modulation Techniques in portion Modulation Techniques for Mobile Radio of Wireless/Mobile

1 Answer

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Best answer
Correct option is (a) Twice

Best 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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