1. Some of the M-ary waveforms are

2. Which method should be implemented for reducing bandwidth?

3. In M-ary PPM waveform, modulation is effected by

4. For both PPM and PDM _______ is kept constant.

5. The method in which small amount of controlled ISI is introduced into the data stream rather than trying to eliminate it completely is called as

6. From digital filter we will get the output pulse as the _______ of the current and the previous pulse.

7. In duobinary signalling method, for M-ary transmission, the number of output obtained is

8. The method using which the error propagation in dubinary signalling can be avoided is

9. In precoding technique, the binary sequence is _____ with the previous precoded bit.

10. The duobinary filter, He (f) is called as

11. The method which has greater bandwidth efficiency is called as

12. In polybinary signalling method the present bit of binary sequence is algebraically added with ______ number of previous bits.

13. The primary advantage of this method is

14. Source encoding procedure does

15. Which signals are function of time?

16. Auto-correlation function is a

17. Shot noise occurs in

18. Source coding reduces

19. Delay element in delta modulation acts as

20. Non uniform quantization includes

21. The quantization will be finer when

22. Different cases of sampling include

23. Transmitted pulse becomes distorted due to

24. In which mixing is easier?

25. Which filter does not have sharp output?

26. Using ARMA filter

27. To avoid aliasing

28. Which requires interpolation filtering?

29. A to D conversion process uses

30. Reconstruction filter is difficult to implement in hardware.

31. Which process requires low pass filter?

32. Decreasing the data rate is called as

33. Original signal came to be retraced from sampled version using

34. The signal can be reconstructed

35. Which device is needed for the reconstruction of signal?

36. The term heterodyning refers to

37. The causes for error performance degradation in communication systems are

38. Thermal noise in the communication system due to thermal electrons

39. White noise has _______ power spectral density.

40. Which are called as hard decisions?

41. The filter which is used to recover the pulse with less ISI is called as

42. The composite equalizing filter is the combination of

43. The sample from the demodulation process consists of sample which is _______ to energy of the received symbol and _____ to noise.

44. The average noise power of white noise is

45. The channel may be affected by

46. Channels display multi-path due to

47. The method in which the tail of one pulse smears into adjacent symbol interval is called as

48. If each pulse of the sequence to be detected is in _____ shape, the pulse can be detected without ISI.

49. What is symbol rate packing?

50. A nyquist pulse is the one which can be represented by _____ shaped pulse multiplied by another time function.