IT2202 PRINCIPLES OF COMMUNICATION ANNA UNIVERSITY QUESTION PAPER

ANNA UNIVERSITY QUESTION PAPER IT2202 PRINCIPLES OF COMMUNICATION

 

PRINCIPLES OF COMMUNICATION ANNA UNIVERSITY QUESTION PAPER

 

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010
Third Semester
Information Technology
IT2202 — PRINCIPLES OF COMMUNICATION
(Regulation 2008)
Time: Three hours Maximum: 100 Marks
Answer ALL Questions

PART A — (10 × 2 = 20 Marks)

1. For an AM DSBFC modulator with a carrier frequency fc = 200 KHz and a
maximum modulating signal frequency fm(max) = 4 KHz. Determine bandwidth
and frequency limits for the upper and lower side bands.
2. For a modulation coefficient m = 0.2 and an unmodulated carrier power
Pc = 100 W, determine total transmitted power.
3. Define ASK, PSK and FSK.
4. What is meant by antipodal signal and give one example?
5. Define dynamic range.
6. Determine the Nyquist sample rate for a maximum analog input frequency of
(a) 4 KHz
(b) 10 KHz.
7. A spread spectrum communication system has the following parameters;
information bit duration Tb = 4.095 ms, PN chip duration Tc = 1 ms. Determine
Processing Gain.
8. What is meant by slow frequency hopping and fast-frequency hopping?
9. Define Apogee and Perigee.
10. Write any two advantages of optical fiber cables.
PART B — (5 × 16 = 80 Marks)
11. (a) Explain AM voltage distribution and AM power distribution.
Or
(b) In angle modulation, explain frequency deviation, percent modulation,
phase deviation and modulation index with suitable example.
12. (a) Describe FSK transmitter and FSK receiver.
Or
(b) Explain in detail carrier recovery with a suitable block diagram.
13. (a) For a PCM system with the following parameters, determine
(i) Minimum sampling rate
(ii) Minimum number of bits used in the PCM code
(iii) Resolution and
(iv) Quantization error
Maximum analog input frequency = 4 KHz
Maximum decoded voltage at the receiver = ± 2.55 V
Minimum dynamic range = 46 dB.
Or
(b) Describe DPCM transmitter and receiver with suitable block diagram.
14. (a) Discuss the frequency HOP spread spectrum with suitable block
diagram.
Or
(b) Explain the source coding of speech for wireless communications.
15. (a) Describe a satellite communication system with a suitable block diagram.
Or
(b) How do losses occur in optical fiber cables? Discuss in detail.