Question

On radiating (sending out) an AM modulated signal, the total radiated power is due to energy carried by ω_c, ω_c – ω_m & ω_c + ω_m. Suggest ways to minimise cost of radiation without compromising on information.

Answer 1

Of  ω_c – ω_m, ω_c and ω_c + ω_m, only ω_c + ω_m or  ω_c – ω_m contains information. Hence cost can be reduced by transmitting ω_c + ω_m,  ω_c – ω_m, both ω_c + ω_m &  ω_c – ω_m