Q.

Which of the following is not a linear modulation technique?

A. oqpsk
B. π/4 qpsk
C. fsk
D. bpsk
Answer» C. fsk
Explanation: oqpsk, π/4 qpsk and bpsk are the most popular linear modulation techniques. they have very good spectral efficiency. however, fsk is an non-linear modulation technique.
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