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 minimize cost of radiation without compromising on information.

Note that the frequencies and are enough to carry all the information; is unnecessary. The first two can be added to get two times carrier frequency.

However, we are interested in the message signal. We can subtract the smaller value ( from the larger value (to get two times the frequency of the message signal.

Hence, we can minimize cost of radiation by only transmitting and .