Topic: Communication Systems
The modulation index of an amplitude modulated wave is changed from 0 to 1. The transmitted power is
- A. Doubled
- B. Halved
- C. Increased by 50 percent
- D. Unchanged
Answer: C. Increased by 50 percent
Explanation: Use the formula $P_{t}=P_{c}(1+\frac{m^{2}}{2})$. For $m=0$, $P_{t}=P_{c}$. For $m=1$, $P_{t}=P_{c}(1+\frac{1}{2}) = 1.5 P_{c}$. Hence, the transmitted power is increased by 50 percent.