In an FM system, the single-tone sinusoidal message signal has bandwidth W = 15 kHz. Noise power spectral density is No/2 = 5 x 10-15 Watts/Hz. The FM modulation has modulation index 3 = 5. If the required SNR after demodulation is 80 dB, what is the required power of FM signal s(t)?

In an FM system, the single-tone sinusoidal message signal has bandwidth W = 15 kHz. Noise power spectral density is No/2 = 5 x 10-15 Watts/Hz. The FM modulation has modulation index 3 = 5. If the required SNR after demodulation is 80 dB, what is the required power of FM signal s(t)?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Amplitude modulation

A radio signal can carry information in the form of sound or image for broadcasting or communication. For it to be sent to a greater distance, the signal must be changed or modulated in some way. One of the easiest way is to change the amplitude of the signal with variations of the video or the audio signal. This is called Amplitude Modulaton. In this modulation information of message is carried in amplitude of carrier signal.

Question

In an FM system, the single-tone sinusoidal message signal has bandwidth W = 15
kHz. Noise power spectral density is No/2 = 5 x 10-15 Watts/Hz. The FM modulation
has modulation index 3 = 5. If the required SNR after demodulation is 80 dB, what is
the required power of FM signal s(t)?

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