Topic: Communications
What is the limit of E_b/N_0, below which reliable communication is not possible?
- A. -10 dB
- B. -1.6 dB
- C. 0 dB
- D. 1.6 dB
Answer: B. -1.6 dB
Explanation: For reliable communication, limit for E_b/N_0 is E_b/N_0 = ln(2) = 0.693. E_b/N_0 (dB) = -1.6 dB. Thus, limit for reliable communication is -1.6 dB. If it falls below it errors will be very high.