5G Wireless Standard Design Nptel Week 3 Answers
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5G Wireless Standard Design Nptel Week 3 Answers (July-Dec 2025)
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Question 1. In 5G transceiver chain which functional block removes the NULL bits:
a) CRC Addition
b) Code Block Segmentation
c) Rate Matching
d) LDPC Decoding
Question 2. In PDSCH, what is the resultant bit sequence after performing Interleaving on bit sequence “100101011110” when QPSK is used for modulation.
a) 100110110110
b) 011110100101
c) 100101110110
d) 011110101001
Question 3. Identify the functionality below from section 5.2 of 38.211 document from 3GPP Release 15 and name the block in which this functionality is used .
c(n)=(x1(n+Nc)+x2(n+Nc))mod2
x1(n+31)=(x1(n+3)+x1(n))mod2
x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
a) Rate Matching
b) Scrambling
c) LDPC encoding
d) Interleaving
Question 4. If a user is assigned 24 PRBs over 12 OFDM symbols in a given slot for PDSCH and with 16 QAM Modulation. When the transport block size is 7986 then calculate the value of G.
a) 1 point
b) (missing options – please provide them)
Question 5. In Question 4 if the transport block size is 9875 then calculate the size of rate matched block.
a) (missing options – please provide them)
Question 6. Pick the Correct Order in which we perform 5G NR processing on data from left to right for PDSCH during transmission.
a) LDPC coding, Scrambling, Modulation, Interleaving
b) Rate matching, LDPC coding, CRC addition, Modulation
c) Segmentation, LDPC coding, Rate matching, Interleaving
d) CRC addition, Segmentation, Rate matching, LDPC coding
These are 5G Wireless Standard Design Nptel Week 3 Answers
Question 7. If 150 PRBs are allocated over 13 OFDM symbols to transmit a PDSCH with transport block size of 32,984 bits using 64-QAM modulation. Calculate the RV index for the 3rd retransmission if the LDPC encoder is using base graph 1.
Note: Assume that in each PRB 6 REs are allocated for DMRS.
a) (missing options – please provide them)
Question 8. The number of slots per subframe in a 5G system that has a sub-carrier spacing of 30kHz.
a) (missing options – please provide them)
Question 9. Identify the pseudo code from the standards and specify the block which denotes this functionality.
a) Segmentation
b) Rate matching
c) LDPC encoding
d) Interleaving
These are 5G Wireless Standard Design Nptel Week 3 Answers
