5G Wireless Standard Design Week 4 NPTEL Assignment Answers 2025
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📅 Week: 4
🎯 Session: NPTEL 2025 July-October
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NPTEL 5G Wireless Standard Design Week 4 Assignment Answers 2025
1. For the given channel y = x + n the pdf of noise is given by
Calculate the MAP threshold value α if the transmitter is transmitting using BPSK symbol such that 0 is mapped to -1 and 1 is mapped to +1 with P(x = 0) = 1/3 and P(x = 1) = 2/3 .
- 0
- 1/2
- -1/3
- 1/6
Answer : See Answers
2. Find the new threshold value in question 1 if the transmitter is transmitting using BPSK symbol such that 0 is mapped to 0 and 1 is mapped to 1 with rest of the parameters remaining same.
- 0
- -1/2
- 1/3
- -1/6
Answer :
3. The scrambiling sequence will affect the LLR values which will be fed to the soft-decoder.
- True
- False
Answer :
4. Consider a user for which 125 PRBs is allocated across 12 OFDM symbols.
Calculate the total number of RE’s available for the user to transmit the PDSCH.
Note: Reserve the desired number of subcarriers for pilots (as taught in the class).
Answer :
5. In the above question if the user uses a 64-QAM modulation with the code rate of 600/1000 calculate the number of intermediate information bits available to the user across 3 layers. Give NInfo/100 as the final answer.
Answer :
6. In question 4 if the user is allocated 13 symbols with rest of the conditions unchanged calculate the gain in number of RE’s that the user will get to transmit the PDSCH.
- 10%
- 8.7%
- 17.39%
- 20%
Answer : See Answers
7. The low pass filter is used in the base band processing at the receiver to.
- to remove the effect of noise
- to obtain the transmitted IQ samples
- to nullify the effect of carrier frequency offset
- to estimate the channel
Answer :
8.
Answer :
9. What is the purpose of using the pass band filter at the receiver while recovering the base band signal?
- to supress the effect of the carrier frequency offset across pass band.
- to supress the effect of the carrier phase offset inside pass band.
- to limit the pass band noise.
- to increase the gain of the system in the required band.
Answer : See Answers
