Q.

In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is            and power efficiency is                  

A. identical, superior
B. less, superior
C. identical, identical
D. superior, superior
Answer» A. identical, superior
Explanation: the power spectrum and bandwidth efficiency of qam modulator is identical to m-ary psk modulation. but, in terms of power efficiency qam is superior to m-ary psk.
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