Concatenated Codes

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Concatenated and interleaving codes and its application in CD”.

1. Compact disc is used for
a) Digital storage
b) Reproduction of audio signals
c) Digital storage & Reproduction of audio signals
d) None of the mentioned

2. Sources of channel errors are
a) Finger prints
b) Air bubbles
c) Unwanted particles
d) All of the mentioned

3. The CIRC error control scheme includes
a) Correction
b) Concealment
c) Correction & Concealment
d) None of the mentioned

4. Decoding step consists of
a) De-interleaving
b) Decoding
c) Deinterleaving and decoding
d) None of the mentioned

5. The ______ the error correcting capability used, the _____ will be the erasure correcting capability.
a) Larger, smaller
b) Smaller, larger
c) Smaller, smaller
d) Larger, larger

6. In interpolation
a) New samples are added
b) Unreliable samples are removed
c) New samples are added & Unreliable samples are removed
d) None of the mentioned

7. The channel that exhibits multi-path fading
a) Has memory
b) Exhibits mutually dependent signal transmission impairments
c) Received signal will be distorted
d) All of the mentioned

8. Separating the symbols makes the channel memory-less.
a) True
b) False

9. The minimum end to end delay in block interleaving is
a) 2MN+2M+2
b) 2MN-2M+2
c) 2MN-2M-2
d) 2MN+2M-2

10. A concatenated code uses
a) One level of coding
b) Two levels of coding
c) Three levels of coding
d) None of the mentioned

11. A concatenated code has
a) Low error rate
b) High complexity
c) Low error rate & High complexity
d) None of the mentioned

12. The performance of non binary concatenated code depends on
a) Bit errors
b) Symbols errors
c) Bit & Symbols errors
d) None of the mentioned

13. Concatenated code is an example of
a) Error detecting code
b) Error correcting code
c) Error detecting & correcting code
d) None of the mentioned

14. Turbo code is a
a) Serial concatenation code
b) Parallel concatenation code
c) Block code
d) None of the mentioned

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