Q.

                   can potentially provide spectral conservation through the use of multilevel signalling.

A. m-ary psk
B. mfsk
C. ask
D. dfsk
Answer» A. m-ary psk
Explanation: in m-ary schemes, the spectral efficiency is increased by the factor log2 m.this is purely for m-level schemes which can provide multilevel signalling patterns.
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