Question

At a given probability of error, binary coherent FSK is inferior to binary coherent PSK by

• A. 6 dB
• B. 3 dB
• C. 2 dB
• D. 0 dB

Hint:

When comparing digital modulation schemes, remember that FSK typically requires more energy than PSK for the same bit error rate.

Answer 1

The Correct Option is A

In binary modulation schemes, FSK (Frequency Shift Keying) requires more power to achieve the same probability of error as compared to PSK (Phase Shift Keying). At a given probability of error, binary coherent FSK is generally inferior to binary coherent PSK by 6 dB due to the higher energy required for frequency shifts in FSK.