Digital communication system
Previous year question paper with solutions for Digital communication system
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- What is Nyquist rate?
- With diagram define the term Aliasing.
- What is Granular noise in Delta modulation?
- For the binary bit stream 10011011, draw the wave forms for Polar NRZ and Manchester RZ format.
- Write desirable properties of line codes.
- Draw power spectrum of BPSK and QPSK signals.
- What is the relation between BER and SYMBOL error rate?
- Why MSK is called shaped QPSK?
- Write the basic difference between Bandpass transmission and Passband transmission.
- What is the difference between Line coding and source coding?
- What is Schwarz's inequality?
- What do you mean by inter symbol interference?
- Explain the concept of information.
- What is the relation between BER and Symbol error rate
- What do you mean by Quantization error?
- Write advantages of MSK as compared to QPSK.
- What is the significance of EYE diagram?
- Describe coherent binary FSK system.
- What do you mean by Aliasing
- Discuss noise effect in PCM.
- State uniform sampling theorem for baseband signal.
- Define the term: Entropy. Give its unit.
- To demonstrate trade-off between bandwidth and S/N, calculate the channel capacity for a communications channel having i) B = 50 kHz and S/N = 40 dB; and ii) B = 100 kHz and S/N = 20 dB
- Why do we require to discretize the amplitude axis after sampling the time axis of analog signal?
- Consider an input analog information signal to a -law compressor has a positive voltage and amplitude 25% of its maximum value. Show that the output voltage is approximately 75% of the maximum output voltage level which would be produced at the output of -law compressor with = 255.
- Distinguish between NRZ and RZ type of signalling formats.
- What are significant advantages of statistical TDM?
- List advantages and disadvantages of digital communication system.