Digital Baseband Modulation -...
Transcript of Digital Baseband Modulation -...
![Page 1: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/1.jpg)
Digital Baseband Modulation
![Page 2: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/2.jpg)
Outline • Later
![Page 3: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/3.jpg)
Digital Carrier Transmission System
![Page 4: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/4.jpg)
Digital Carrier Transmission System PM, AM, FM Bit rate,Rb Symbol rate, Rs=Rb/k;
M=2^K
![Page 5: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/5.jpg)
Quadrature representation of the BP signals • For bandpass signals
• Often in digital communications the baseband signals I(t) and Q(t) are independent, linearly modulated pulse trains
• Such modulation methods are called quadrature schemes
![Page 6: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/6.jpg)
Alternative Representation of BP Signals • See notes
![Page 7: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/7.jpg)
Example (1) • Notes
![Page 8: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/8.jpg)
Binary Amplitude-Shift Modulation • Also known as Binary Amplitude-Shift Keying (B-ASK) • In BASK, every Tb seconds the modulator transmits a
carrier burst only if the binary information bit is 1. There is no transmission if the information bit is 0
• The resultant BASK signal can be expressed as
• The quadrature component Q(t) is zero
![Page 9: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/9.jpg)
SQUARE PUSE SIGNAL
![Page 10: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/10.jpg)
Coherent Demodulation
![Page 11: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/11.jpg)
Error Performance
![Page 12: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/12.jpg)
BPSK
![Page 13: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/13.jpg)
BPSK Modulation
![Page 14: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/14.jpg)
BPSK Coherent Demodulation
![Page 15: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/15.jpg)
Binary Frequency Shift Keying (BFSK)
![Page 16: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/16.jpg)
FSK
![Page 17: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/17.jpg)
Coherent Demodulation of BFSK signals
![Page 18: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/18.jpg)
![Page 19: Digital Baseband Modulation - web.sonoma.eduweb.sonoma.edu/users/f/farahman/sonoma/courses/ces540/lectures/Chapter3.9_Dig.pdf · Quadrature representation of the BP signals • For](https://reader030.fdocuments.in/reader030/viewer/2022040216/5d1e7fdd88c9934c378ba8ff/html5/thumbnails/19.jpg)
References • Leon W. Couch II, Digital and Analog Communication
Systems, 8th edition, Pearson / Prentice, Chapter 3-5 • "M. F. Mesiya, ”Contemporary Communication Systems”,
1st ed./2012, 978-0-07-. 338036-0, McGraw Hill. Chapter 11