A hybrid communication system uses both AMSC and FM. The information signal a(t)

Question

A hybrid communication system uses both AMSC and FM. The information signal a(t) is first AMSC modulated with the subcarrier frequency 1000 Hz. Then it passes through an FM modulator with the carrier frequency 10Mhz. Its average power should be 50W, Kf is 2Hz/v, and a(t) = 2 cos (100pi*t).

An Am communication system is designed to satisfy the following requirements. The system has 3 channels and channel is used to transmit a digital signal of data date 2,000 symbols/sec. The carrier frequency of the carrier channels is f_c2= 1MHz The left channel has a carrier frequency f_c1=f_c2-delta f. The right channel has a carrier frequency f_c3=f_c2+delta f. For simplicity, the digital signals are assumed to be periodic square waves, with a positive pulse considered one symbol and a negative pulse considered another symbol. Suppose the signal distortion to the adjacent channel is no more than 3% of the total signal power of a channel. The signal distortion is achieved by adjusting the center frequency of each channel instead of using filtering in the transmitter.

Explanation / Answer

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