Q. 55 
Assuming high SNR and that all signals are equally probable, the additional average transmitted signal energy required by the 8-PSK signal to achieve the same error probability as the 4-PSK signal is
(A) 11.90 dB
(B) 8.73 dB
(C) 6.79 dB
(D) 5.33 dB
Answer: D
Explanation:
