Convolutional Codes

Wireless & Mobile Communications

This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Convolutional Codes”.

1. Block codes can achieve a larger coding gain than convolution coding.
a) True
b) False
.

2. 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

3. Which of the following is not a way to represent convolution code?
a) State diagram
b) Trellis diagram
c) Tree diagram
d) Linear matrix

4. Which of the following is not an algorithm for decoding convolution codes?
a) Viterbi algorithm
b) Stack algorithm
c) Fano’s sequential coding
d) Ant colony optimization

5. Viterbi algorithm performs ____________ decoding of convolutional codes.
a) Maximum likelihood
b) Maximum a posteriori
c) Minimum square
d) Minimum mean square

6. Fano’s algorithm searches all the paths of trellis diagram at same time to find the most probable path.
a) True
b) False

7. Which of the following is not an advantage of Fano’s algorithm in comparison to Viterbi’s algorithm?
a) Less storage
b) Large constraint length
c) Error rate
d) Small delays

8. In comparison to stack algorithm, Fano’s algorithm is simpler.
a) True
b) False

9. Which of the following is not an error correction and detection code?
a) Block code
b) Convolutional codes
c) Passive codes
d) Turbo codes

10. Which decoding method involves the evaluation by means of Fano’s algorithm?
a) Maximum Likelihood Decoding
b) Sequential Decoding
c) Maximum a priori
d) Minimum mean square
.

11. In Viterbi’s algorithm, the selected paths are regarded as __________
a) Survivors
b) Defenders
c) Destroyers
d) Carriers

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