Q.

M-ary modulation schemes have very good power efficiency.

A. true
B. false
Answer» B. false
Explanation: m-ary modulation schemes have poor power efficiency, but they have a better bandwidth efficiency. an 8-psk system requires a bandwidth that is 3 times smaller than a bpsk system, whereas its ber performance is very worse since signals are packed more closely in the signal constellation.
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