chapter_3_part_1 - Chapter 3 Analog Signal Transmission and...

Info icon This preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 3: Analog Signal Transmission and Reception Part I Dr. Barış Atakan
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 2
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)
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 4
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
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Amplitude Modulation (AM) In amplitude modulation, the message signal m(t) is impressed on the amplitude of the carrier signal c(t)
Image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern