Question Paper Details:
University: Rajasthan Technical University
Course: B.Tech Computer science & engineering
Subject: Analog & Digital Communication
Exam Year: June 2010
Year or Semester: Second year/ Fourth Semester
Paper Code: 4E2920
Year or Semester: Second year/ Fourth Semester
Paper Code: 4E2920
Unit-I
a) Derive the equation of amplitude modulation (AM) also power relation and frequency spectrum of AM. [Marks 10]
b) Explain the working of envelop (Diode) detector circuit for AM detection. [Marks 6]
OR
a) Explain the different methods of generation of SSB signal. [Marks 10]
b) Determine the power content of the carrier and each of side band for AM signal having % modulation of 80% and total power of 2500 watt. [Marks 6]
Unit-II
a) Explain the principle of FM detection. Also explain any one method of FM demodulator in brief. [Marks 8]
b) Compare AM, FM, PM. [Marks 8]
Unit-III
a) Explain the working of pulse code modulation (PCM). Define the signal to quantization noise ration in PCM. [Marks 10]
b) In binary PCM, the O/P signal to quantization ratio is to be held to minimum of 40 dB. Determine number of level required. [Marks 6]
OR
a) Compare PCM, DPCM, DM and ADM. [Marks 10]
b) Determine error probability in PCM system. [Marks 6]
Unit-IV
a) Explain the types of line coding in brief. [marks 10]
b) The data rate in T1 carries system is 1.544 Mb/sec and band width is 50 KHz. What SNR is needed to put T1 carries on 50 KHz channel? [marks 6]
OR
Explain pulse analog (PAM, PWM, PPM) modulation & demodulation in brief. [Marks 16]
Unit-V
Write the short notes on following:
i) ASK (Amplitude shift keying)
ii) BFSK
iii) QPSK
iv) PSK
OR
a) Calculate error probability performance of ASK, BPSK and QPSK. [Marks 10]
b) A binary receiver system receive a bit rate of 1 Mb/s. the wave form amplitude in 5 mV and the nose power spectral density is 0.5×10^11 WHz. Calculate bit error probability if modulation scheme are
i) ASK
ii) DSK
About The Author
bkd
Bharat Kumar Dhaker Founder and Editor of ComputerSciencearticle.in, He is an Engineering[Computer Science] Student From Rajasthan. He has a knowledge of C, C++, Java, Adv. Java, HTML and little bit knowledge of PHP.
