5G Wireless Standard Design Nptel Week 1 Answers
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5G Wireless Standard Design Nptel Week 1 Answers (July-Dec 2025)
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Question 1. In an OFDM system, inter-symbol interference can be avoided using
a) Orthogonal sub-carriers
b) Cyclic prefix
c) IFFT
d) Encoding
Question 2. Calculate the sampling rate for a 5G NR System with 30kHz subcarrier spacing and 50MHz bandwidth.
a) 245.76 MHz
b) 122.88 MHz
c) 61.44 MHz
d) 30.72 MHz
Question 3. Consider a 5G system with a bandwidth of 100MHz. If the signal-to-noise ratio (SNR) of the received signal is 9dB, what is the maximum rate (in Mbps) at which the receiver can decode the signal successfully without any error?
a) 180Mbps
b) 280Mbps
c) 316Mbps
d) 459Mbps
Question 4. The number of slots per subframe if the system uses a sub-carrier spacing of 60kHz.
a) 1
b) 2
c) 4
d) 8
Question 5. Calculate the IFFT size required for a 50MHz 5G NR system with subcarrier spacing ∆f = 15kHz.
a) 4096
b) 2048
c) 1024
d) 8192
Question 6. The 5G system which uses incremental redundancy retransmission mode with an effective code rate of 1/4 did an initial transmission. But the receiver failed to successfully decode the data in the first attempt and requested for 2 more retransmissions. Calculate the code rate at which the receiver was able to successfully decode the data.
a) 1/8
b) 1/4
c) 1/12
d) 3/7
Question 7. The minimum SNR (in dB) required to achieve the capacity of 5 bps/Hz is approximately
a) 5 dB
b) 15 dB
c) 21 dB
d) 31 dB
Question 8. What is the best approach to maintain a link when UE experiences sudden drop in SNR?
a) Decrease the code-rate
b) Increase the code rate
c) Increase transport block CRC length
d) Modify CRC polynomial with same degree as before
These are 5G Wireless Standard Design Nptel Week 1 Answers