In a broadcasting communication system, the transmitter power Pr is 80 KW, the channel attenuation is 80 dB (the attenuation in dB between Pr and the received signal power Pris computed as 10log,0(Pr/Pa)), and the noise power spectral density is 10-11 W/Hz. The message signal has a bandwidth W 100KHZ. 1) Find the predetection signal-to-noise ratio ), for the cases when the modulations are DSB-SC, DSB-LC and SSB, respectively. 2) Find the output signal-to-noise ratio (A if the modulation is DSB. 3) Find the output signal-to-noise ratio (), if the modulation is SSB. 4) Find the output signal-to-noise ratio ) if the modulation is DSB-LC (assume cohere (). detector is used in demodulation) with a modulation index 0.8

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Frequency Modulation

Frequency modulation is a method or process of encoding the data of a specific signal (analog or digital) by modulating the carrier wave frequency according to the frequency of the modulated signal. Modulated signals are nothing more than information or data that should be conveyed after being converted into electronic signals.