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GATE ECE 2011 | Question-53

Statement for Linked Answer Questions 52 and 53:

A four-phase and an eight-phase signal constellation are shown in the figure below.


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

  1. $11.90 \mathrm{~dB}$
  2. $8.73 \mathrm{~dB}$
  3. $6.79 \mathrm{~dB}$
  4. $5.33 \mathrm{~dB}$
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