Information theory and coding

1. In discrete memoryless source, the current letter produced by a source is statistically independent of . . . . . . . . A. Past output B. Future output C. Both A and B D. None of the above

Past output
Future output
Both A and B
None of the above

Detailed SolutionIn discrete memoryless source, the current letter produced by a source is statistically independent of . . . . . . . . A. Past output B. Future output C. Both A and B D. None of the above

3. For a received sequence of 6 bits, which decoding mechanism deals with the selection of best correlated sequence especially by correlating the received sequence and all permissible sequences? A. Soft Decision Decoding B. Hard Decision Decoding C. Both A and B D. None of the above

Soft Decision Decoding
Hard Decision Decoding
Both A and B
None of the above

Detailed SolutionFor a received sequence of 6 bits, which decoding mechanism deals with the selection of best correlated sequence especially by correlating the received sequence and all permissible sequences? A. Soft Decision Decoding B. Hard Decision Decoding C. Both A and B D. None of the above

4. While decoding the cyclic code, if the received code word is similar as transmitted code word, then r(x) mod g(x) is equal to . . . . . . . . A. Zero B. Unity C. Infinity D. None of the above

Zero
Unity
Infinity
None of the above

Detailed SolutionWhile decoding the cyclic code, if the received code word is similar as transmitted code word, then r(x) mod g(x) is equal to . . . . . . . . A. Zero B. Unity C. Infinity D. None of the above

7. Which among the following represents the code in which codewords consists of message bits and parity bits separately? A. Block Codes B. Systematic Codes C. Code Rate D. Hamming Distance

Block Codes
Systematic Codes
Code Rate
Hamming Distance

Detailed SolutionWhich among the following represents the code in which codewords consists of message bits and parity bits separately? A. Block Codes B. Systematic Codes C. Code Rate D. Hamming Distance

8. Four messages band limited to W, W, 2W and 3W respectively are to be multiplexed using Time Division Multiplexing (TDM). The minimum bandwidth required for transmission of this TDM signal is A. W B. 3W C. 6W D. 7W

W
3W
6W
7W

Detailed SolutionFour messages band limited to W, W, 2W and 3W respectively are to be multiplexed using Time Division Multiplexing (TDM). The minimum bandwidth required for transmission of this TDM signal is A. W B. 3W C. 6W D. 7W

9. For designing a communication system, which among the following parameters should be maximum? 1. Transmission rate 2. Received signal-to-noise ratio 3. Error probability 4. Bandwidth requirement A. 1 and 2 B. 3 and 4 C. 1 and 3 D. 2 and 4

1 and 2
3 and 4
1 and 3
2 and 4

Detailed SolutionFor designing a communication system, which among the following parameters should be maximum? 1. Transmission rate 2. Received signal-to-noise ratio 3. Error probability 4. Bandwidth requirement A. 1 and 2 B. 3 and 4 C. 1 and 3 D. 2 and 4

10. In a Direct Sequence CDMA system the chip rate is 1.2288 × 106 chips per second. If the processing gain is desired to be AT LEAST 100, the data rate A. Must be less than or equal to 12.288 × 10 bits per second B. Must be greater than 12.288 × 103 bits per second C. Must be exactly equal to 12.288 × 103 bits per second D. Can take any value less than 122.88 × 103 bits per second

Must be less than or equal to 12.288 × 10 bits per second
Must be greater than 12.288 × 103 bits per second
Must be exactly equal to 12.288 × 103 bits per second
Can take any value less than 122.88 × 103 bits per second

Detailed SolutionIn a Direct Sequence CDMA system the chip rate is 1.2288 × 106 chips per second. If the processing gain is desired to be AT LEAST 100, the data rate A. Must be less than or equal to 12.288 × 10 bits per second B. Must be greater than 12.288 × 103 bits per second C. Must be exactly equal to 12.288 × 103 bits per second D. Can take any value less than 122.88 × 103 bits per second

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