chapter_3_part_1

# chapter_3_part_1 - Chapter 3 Analog Signal Transmission and...

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Chapter 3: Analog Signal Transmission and Reception Part I Dr. Barış Atakan

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Background The energy content of a signal x(t): The power content of a signal: A signal is energy-type if E x < ∞ and is power-type if 0 < P x < ∞ All periodic signals (with exception x(t) ≡ 0) are power type. We will mosly focus on power-type signals
Background The amount of power per hertz of bandwidth present in the signal at various frequencies The power content of the signal can be obtained from The power-spectral density or the power spectrum of the signal x(t) The time-average autocorrelation function of the power-type signal x(t)

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Introduction to Analog Modulation Transmission of a message signal usually requires a shift of message frequency range to another frequency range suitable for transmission A shift in the signal frequency range is accomplished by modulation Analog signal transmission: audio and video broadcast We consider the transmission of analog signals by carrier modulation Assumptions : Message signal is denoted by m(t) , which is assumed to be a lowpass signal of bandwidth W , i.e., M( f ) ≡ 0, for | f | > W m(t) is assumed to be a power-type signal having power P m given as
Introduction to Analog Modulation Carrier signal: A c : carrier amplitude, f c : carrier frequency c : carrier phase We consider the transmission of an analog signal by impressing it on either the amplitude, the phase, or the frequency of a sinusoidal carrier When the amplitude of the carrier signal is linearly related to the message signal m(t), the result is amplitude modulation When the phase or its derivative is linearly related to m(t), the result is phase or frequency modulation . They are collectively called as angle modulation

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Amplitude Modulation (AM) In amplitude modulation, the message signal m(t) is impressed on the amplitude of the carrier signal c(t)
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• Fall '11
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