An AM Scheme is working with a modulation index of 0.8. Power efficiency of this modulation Scheme is

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TANGEDCO AE EE 2018 Official Paper

Answer 1

Concept:

The efficiency of a modulation scheme is defined as:

$E f f i c i e n c y = \frac{S i d e b a n d p o w e r}{T o t a l p o w e r}$

Mathematically, the power efficiency of an AM signal with single tone modulation is given by:

$η_{A M} = \frac{μ^{2}}{2 + μ^{2}}$

μ = Modulation index

Calculation:

With μ = 0.8, the efficiency will be:

$η_{A M} = \frac{{0.8}^{2}}{2 + {0.8}^{2}} = \frac{0.64}{2.64}$

η = 24.24 %

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