Question

which is the constant envelope modulation scheme?

a) MSK
b)BFSK
c)QPSK
d) all the above​

Answer 1

Answer:

option a

Explanation:

We call those modulations constant envelope modulations; that is, no signal is modulated on the amplitude. ... Constant envelope modulation can be a linear or a nonlinear modulation in digital mobile systems. In general, constant envelope modulation is used for the nonlinear modulation (FM) in analog mobile systems.

The MSK modulation is a constant envelope signal with continuous phase that results from modulating the instantaneous frequency with rectangular pulses. ... MSK is considered to be a special case of Offset QPSK (OQPSK) with half sinusoidal pulse weighting rather than rectangular.

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