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The bandwidth of OQPSK is _______ to QPSK.

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The bandwidth of OQPSK is _______ to QPSK.

(a) Identical

(b) Twice

(c) Half

(d) Four times

I have been asked this question in class test.

Question is taken from Linear Modulation Techniques in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct choice is (a) Identical

The explanation is: The spectrum of an OQPSK signal is identical to that of QPSK signal. Hence, both signals occupy the same bandwidth. The staggered alignment of the even and odd bit streams in OQPSK signal does not change the nature of spectrum.

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