QUESTION BANK. Sandeep Kumar Bansal. Electronics & Communication Department

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1 QUESTION BANK Sandeep Kumar Bansal Electronics & Communication Department

2 ANALOG AND DIGITAL COMMUNICATION QUESTION BANK BRANCH 4 TH SEM CS/IT UNIT-1 1. Draw the circuit diagram of balanced modulator using diode for generation of DSB-SC wave. Describe the working of this circuit necessary mathematics. 2. What is single-side band suppressed carrier modulation? What are it s advantage and disadvantage with respect to ordinary AM. 3. The DSB-SC wave is demodulated by applying it is a coherent detector. Evaluate the effect of phase error ǿ in the locally generated carrier frequency at the detector end. 4. Discuss AM detector by diode detector along with choice of R and C in the detector circuit.

3 5. Determine the power content of each of the sideband and of the carrier of an AM signal that has a percent modulation of 85% and contains 1200w at total power. 6. A 400w carrier is modulation on a depth of 75% calculate the total power in the modulation wave for full AM wave. 7. Why is the necessary of modulation? Explain demodulation also. 8. Explain the different types of modulation. UNIT-II 1. Discuss the parameter variation method of FM generation, Include the necessary mathematics. 2. An FM wave is given by- S(t) = 20 Sin [6 X 10 8 t + 7 Sin 1250 t] Determine: (i) The carrier and modulation frequency the modulation index and the maximum derivation. (ii) Power dissipated by this FM in a 100Ω resister.

4 3. Explain with the help of a block diagram. An indirect (Armstrong) method of generating a wide-band FM signal. 4. Derive the expression for NBFM signal and give the block diagram for its output generation. 5. Draw the circuit diagram of FM demodulate circuit. Explain the working of this circuit. 6. A carrier wave of frequency 100 MHz modulated by a sinusoidal wave of amplitude 20 volts and frequency 100KHz. The frequency sensitivity of the modulation is 25 KHz per volt. Determine the approximate bandwidth at the FM signal, (i) Assuming that the amplitude of modulating signal is doubled. (ii)assuming that the modulation frequency is double. 7. Draw circuit diagram and discuss balanced slop detector for FM Demodulation. UNIT III 1. What do you mean by quantization noise, Drive an expression to calculate quantization noise in a PCM System. 2. Draw the block diagram of PCM system and discuss each block. 3. Explain the concept of transmission bandwidth in a PCM system. 4. A PCM System use a uniform quantizer followed by a 5 bit decoder, show that RMS signal to quantization noise ratio is approximate given as (1.8+6v)dB. 5. Explain differential pulse code modulation.

5 6. Given a sine wave frequency FM and amplitude AM applied to a delta modulator having step size. Show that the slop overload distortion will occur if (Am /2πfmTs), here Ts is sampling period. 7. What are the advantages of PCM over all other analog method of modulation. 8. Compare DPCM performance w r t PCM technique briefly. UNIT IV 1. Describe the working of APD. Why APD is preferred over other photo detector. 2. Discuss different type of losses in optical fiber communication. How dispersion limits the max. data rate. 3. Draw the circuit diagram and describe PAM. 4. Explain various PAM formats like unipolar RZ and NRZ, Polar RZ and NRZ, Biplolar NRZ signals. 5. State and prove the sampling theorem 6. Determine the nyquist rate for a countinous time signal X(t)=6cos50πt+20sin300πt-10cos100πt. 7. Explain various method to couple two fiber which carry light signals. 8. Explain the cause of inter symbol interference(isi) and the method to remove it. 9. Describe about laser diode. Why is it preferred optical fiber communication 10. Discuss the reason of error in pulse transmission over band limited channels and how are they minimized.

6 UNIT V 1. What are the fundamental properties of a cyclic code. Explain any one cyclic code in briefly. 2. A DMS has 6 symbols x1 to x6 with p(x1)=0.3, p(x2)=0.25,p(x3)=0.05,p(x4)=.08,p(x5)=.12,p(x6)=.20 Construct a shanon-fano coding for x. Determine it s entropy. Calculate an average code word length and code efficiency. 3. Compare the following ditigal modulation technique on the basis of band width requirement and S/N ratio. (1.) ASK (2.) PSK(3.) FSK 4. Define mutual information and equivocation in transmission of information. Obtain shanon-hartley law. 5. The generator polynomial of a(7,4) cyclic code is g(x)=1+x+x 3 Find the 16 codeword of this code. 6. A applying shanon- fano coding procedure compute efficiency for the following message resemble IxI=Ix1,x2,x3,x4,x5,x6,x7,x8I (p)=(1/4,1/8,1/16,1/16,1/16,1/4,1/16,1/8) Take M=2. 7. Compare typical features of FSK and PSK modulation techniques along with suitable mathematical expression. 8. Write short notes on 1. Linear block code

7 2. FSK receiver 3. Generation of QPSK signal 4. Minimum Shift Keying

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