Q. Turbo codes are
✅ Correct Answer: (A)
forward error correction codes
Explanation: turbo codes are a class of high performance forward error correction codes.
Communication Engineering MCQs | Page - 7
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Q. Components used for generation of turbo codes are
✅ Correct Answer: (C)
inter leavers & punching pattern
Explanation: there are many instances of turbo codes, using different component encoders, input/output ratios, inter leavers, punching patterns.
Q. Decoders are connected in series.
✅ Correct Answer: (A)
true
Explanation: two elementary decoders are
Q. The inter leaver connected between the two decoders is used to
✅ Correct Answer: (B)
scatter error bursts
Explanation: an inter leaver installed between the two decoders connected in series is used to scatter error bursts.
Q. In soft decision approach what does -127 mean?
✅ Correct Answer: (B)
certainly zero
Explanation: the decoder front end produces an integer for each bit in the data stream. this integer is the measure of how likely it is that the bit 0 or 1 and is called as soft bit. it ranges from -127 to 127. here -127 represents certainly zero.
Q. In soft decision approach 100 means?
✅ Correct Answer: (D)
very likely one
Explanation: the decoder front end produces an integer for each bit in the data stream. this integer is the measure of how likely it is that the bit 0 or 1 and is called as soft bit. it ranges from -127 to 127. here 100 represents very likely one.
Q. In soft decision approach 0 represents
✅ Correct Answer: (D)
could be either zero or one
Explanation: the decoder front end produces an integer for each bit in the data stream. this integer is the measure of how likely it is that the bit 0 or 1 and is called as soft bit. it ranges from -127 to 127. here 0 represents ‘could be either zero or one’.
Q. Block codes can achieve a larger coding gain than convolution coding.
✅ Correct Answer: (B)
false
Explanation: convolution code can achieve a larger coding gain that can be achieved using a block coding with the same complexity.
Q. Which of the following indicates the number of input bits that the current output is dependent upon?
✅ Correct Answer: (A)
constraint length
Explanation: constraint length determines the number of input data bits that the current output is dependent upon. the constraint length determines how powerful and complex the code is.
Q. Which of the following is not a way to represent convolution code?
✅ Correct Answer: (D)
linear matrix
Explanation: linear matrix is not a way to represent convolution code. various ways of representing convolution codes are generator matrix, generator polynomial, logic tables, state diagram, tree diagram and trellis diagram.
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