Topic: Communications
A bandpass signal occupies the bandwidth 390 kHz to 410 kHz. What minimum sampling frequency would you use from the options given below, so as to avoid aliasing?
- A. 40 kHz
- B. 820 kHz
- C. 41 kHz
- D. 800 kHz
Answer: C. 41 kHz
Explanation: F_H = 410 kHz, F_L = 390 kHz. K = floor(F_H / (F_H - F_L)) = floor(410 / 20) = 20. Minimum sampling frequency BW = 2 * F_H / K = (2 * 410) / 20 = 41 kHz.