## NPTEL 5G Wireless Standard Design Week 3 Assignment Answers 2024

1. In PDSCH, what is the resultant bit sequence after performing Interleaving on bit sequence 100101011110 when QPSK is used for modulation

- 100110110110
- 011110100101
- 100101110110
- 011110101001

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2. 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

- Rate matching
- LDPC Encoding
- Scrambling
- Interleaving

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3. If a user is assigned 24 PRBs over a slot for PDSCH and with 16 QAM Modulation. When the transport block size is 8986 then calculate the value of G

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4. If a user is assigned 24 PRBs over a slot for PDSCH and with 16 QAM Modulation. When the transport block size is 8986 then calculate the size of rate matched code block

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5. Pick the Correct Order in which we perform 5G NR processing on data from left to right for PDSCH during transmission

- LDPC coding, Scrambling, Modulation, Interleaving
- Rate matching, LDPC coding, CRC addition, Modulation
- Segmentation, LDPC coding, Rate matching, Interleaving
- CRC addition, Segmentation, Rate matching, LDPC coding

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6. If 150 PRBs are allocated over 14 OFDM symbols to transmit a PDSCH with transport block size of 32,984 bits using 64-QAM modulation. Calculate the circular buffer length for each code block if the LDPC encoder is using base graph 1. Refer lifting size table below for Z_{c} calculation.

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7. If 150 PRBs are allocated over 14 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. Refer lifting size table above for Z_{c} calculation.

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8. If 150 PRBs are allocated over 14 OFDM symbols to transmit a PDSCH with transport block size of 32,984 bits using 64-QAM modulation. Calculate the effective code rate if the LDPC encoder is using base graph 1. Refer lifting size table above for Z_{c} calculation.

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9. Calculate the minimum number of PRBs per symbol MAC scheduler should allocate for PDSCH transmission over 14 OFDM symbols using base graph 1 LDPC coding where transport block size is 40896 and MCS index is 14 .

Note: Refer to the MCS table from module 2 in week 1.

- 94
- 147
- 192
- 251

Answer :-

10. Identify the pseudo code from the standards and specify the block which denotes this functionality

- Segmentation
- LDPC encoding
- Interleaving
- Rate matching

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