dc

Amplitude of 1v.This speech signal applied to a DM whose bit rate is set at
20kbps. Discuss the choice of appropriate step size for the modulator.
26. Derive the expression for Signal to noise ratio of DM system
27. Explain with neat block diagram, Adaptive Delta Modulator transmitter and receiver.
28. Why is it necessary to use greater sampling rate for DM than PCM.
29. Explain the advantages of ADM over DM and how is it achieved.
30. A delta modulator system is designed to operate at five times the Nyquist rate for a
signal with 3KHz bandwidth. Determine the maximum amplitude of a 2KHz input
sinusoid for which the delta modulator does not have slope overload. Quantization step
size is 250mv.Derive the formula used.
31. Compare Delta modulation and PCM techniques in terms of bandwidth and signal to noise
ratio.
32. A signal m (t) is to be encoded using either Delta modulation or PCM technique. The signal
to quantization noise ratio (So/No) ≥ 30dB.Find the ratio bandwidth required for PCM to
Delta modulation.
33. What are the advantages and disadvantages of Digital modulation schemes?
34. Discuss base band transmission of M-ary Data.
35. Explain how the residual effects of the channel are responsible for ISI?
36. What is the practical solution to obtain zero ISI? Explain.
37. What is the ideal solution to obtain zero ISI and what is the disadvantage of
this Solution.
38. Explain the signal space representation of QPSK .Compare QPSK with all other digital
signaling schemes.
39. Write down the modulation waveform for transmitting binary information over
baseband channels for the following modulation schemes: ASK,PSK,FSK and DPSK.
40. Explain in detail the power spectra and bandwidth efficiency of M-ary signals.
41. Explain coherent and non-coherent detection of binary FSK waves.
42. Compare and discuss a binary scheme with M-ary signaling scheme.
43. Derive an expression for error probability of coherent ASK scheme.