CS6304 Analog & Digital Communication, Second year, Department of Computer Science Engineering and Information Technology, First and second Units Questions

CS6304 Analog & Digital Communication, Second year, Department of Computer Science Engineering and Information Technology, First and second Units Questions

Answer All Questions

PART- A (5 x 2 = 10 Marks)

1.      What is communication?

2.      Define Bandwidth.

3.      Find the wavelength of a signal at 850MHz.

4.      Define AM.

5.      Define Modulation Index of AM Wave.

6.      Define DSB-SC.

7.      Draw the frequency spectrum of SSB-SC.

8.      Why we go for modulation?

9.      Express the baud rate and Bandwidth of ASK.

10. Compare Coherent and Non-coherent detection.

PART-B (5X13=65)

11. a) With neat sketch, explain in detail about sources of noise.

(OR)

b) Explain in detail about the noise calculations for several sources.

12. a) With a neat diagram explain in detail about AM.

(OR)

            b) Write short note on DSB-SC and SSB-SC.

13. a) With neat sketch and expressions explain in detail about ASK.

(OR)

b) With neat sketch and expressions explain in detail about FSK.

14. a) With neat sketch and expressions explain in detail about BPSK.

(OR)

            b) What is Angle modulation? Explain the various types of Angle modulation.

15. a) Draw and explain the block diagram of Digital communication system.

(OR)

b) A modulating signal 20sin(2π 10³t) is used to modulate a carrier signal 40sin(2π10⁴t).Find out i) modulation index ii) % modulation iii) frequencies of the side band components and their amplitudes iv) BW of the modulation signal v) draw the spectrum of the AM wave.

PART-B (1X15=15)

16.  With neat sketch and expressions explain in detail about QPSK.