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Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-9

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1. Syndrome is calculated by




2. The _____ of the code-word is the number of non zero elements.




3. Some examples of linear codes




4. The measure of the amount of redundancy is given by




5. The number of k bit shift over which a single information bit influences the encoder output is given by




6. The method used for representing convolution encoder are




7. Periodic truncation is done by




8. Finite state machines have




9. How many number of transitions can be made at each bit time?




10. In trellis diagram, the number of nodes ______ at successive branching.




11. Example for convolution encoder state diagram is




12. In maximum likelihood decoding technique, the likelihood function compares the




13. In maximum likelihood detector the error probability is




14. For a binary code, the maximum number of possible sequence made up of L branch words is




15. If the quantization level of a demodulator output is ________ then it is called as soft decision decoding.




16. Soft decision decoding requires




17. A binary symmetric channel is a




18. Binary symmetric channel is hard decision channel.




19. Gaussian channel is a hard decision channel.




20. Branch word synchronization is the process of determining the




21. Which distance is related to the error correcting capability of the code?




22. A catastrophic error is an event whereby ______ number of code symbol error causes _______ number of decoded data error bits.




23. A code should be selected such that it should




24. The error correcting capability of a code scheme increases as the




25. Which has a limited resolution?




26. Which parameter is used in soft decision algorithm?




27. Which factor is desirable?




28. Soft decision results in




29. A feedback decoder makes hard decision.




30. The look ahead length L is given by




31. On increasing L




32. Reed Solomon codes are




33. The minimum distance for Reed Solomon code is given by




34. R-S codes have




35. Greater the redundancy greater will be the error correcting capability.




36. A primitive element are those which yield ______ when raised to higher order exponents.




37. If the inversion was performed correctly, then the multiplication of the original matrix with the inverted matrix should yield identity matrix. This is known as




38. Compact disc is used for




39. Sources of channel errors are




40. The CIRC error control scheme includes




41. Decoding step consists of




42. The ______ the error correcting capability used, the _____ will be the erasure correcting capability.




43. In interpolation




44. The channel that exhibits multi-path fading




45. Separating the symbols makes the channel memory-less.




46. The minimum end to end delay in block interleaving is




47. A concatenated code uses




48. A concatenated code has




49. The performance of non binary concatenated code depends on




50. Concatenated code is an example of