Communication Engineering MCQs with answers Page - 7

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Q. Turbo codes are

  • (A) forward error correction codes
  • (B) backward error correction codes
  • (C) error detection codes
  • (D) none of the mentioned

A

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Q. Components used for generation of turbo codes are

  • (A) inter leavers
  • (B) punching pattern
  • (C) inter leavers & punching pattern
  • (D) none of the mentioned

A

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Q. Decoders are connected in series.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

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Q. The inter leaver connected between the two decoders is used to

  • (A) remove error bursts
  • (B) scatter error bursts
  • (C) add error bursts
  • (D) none of the mentioned

A

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Q. In soft decision approach what does -127 mean?

  • (A) certainly one
  • (B) certainly zero
  • (C) very likely zero
  • (D) very likely one

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Q. In soft decision approach 100 means?

  • (A) certainly one
  • (B) certainly zero
  • (C) very likely zero
  • (D) very likely one

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Q. In soft decision approach 0 represents

  • (A) certainly one
  • (B) certainly zero
  • (C) very likely zero
  • (D) could be either zero or one

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Q. Block codes can achieve a larger coding gain than convolution coding.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

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Q. Which of the following indicates the number of input bits that the current output is dependent upon?

  • (A) constraint length
  • (B) code length
  • (C) search window
  • (D) information rate

A

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Q. Which of the following is not a way to represent convolution code?

  • (A) state diagram
  • (B) trellis diagram
  • (C) tree diagram
  • (D) linear matrix

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