chapter_5_part_1 - Chapter 5 Effect of Noise on Analog...

Info icon This preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 5: Effect of Noise on Analog Communication Systems Part I Dr. Barış Atakan 1
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
Effect of Noise: Baseband System Baseband systems serve as a basis for comparison No demodulator, just a lowpass filter with bandwidth W P R : Received power 2
Image of page 2
Effect of Noise: DSB AM System The modulated signal is given by The received signal is where n c (t) and n s (t) are the in-phase and quadrature components of the noise 3 c c c f t m A t u 2 cos ) ( ) ( c c c f t m A t u 2 cos ) ( ) (
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
Effect of Noise: DSB AM System For the demodulation, r(t) is first multiplied by cos(2πf c t+ ϕ ) Then it is passed through a lowpass filter. The filter rejects the double-frequency components Remember: 4
Image of page 4
Effect of Noise: DSB AM System By using a coherent or synchronous demodulator, ϕ=ϕ c can be provided. Assuming ϕ=ϕ c =0, 5
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
Effect of Noise: DSB AM System The message signal power is given by The noise power 6
Image of page 6
Effect of Noise:
Image of page 7

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

View Full Document Right Arrow Icon
Image of page 8
Image of page 9

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

View Full Document Right Arrow Icon
Image of page 10
Image of page 11

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

View Full Document Right Arrow Icon
Image of page 12
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