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NPTEL 5G Wireless Standard Design Assignment Answers 2024 (July-October)
    About Lesson

    1. The minimum SNR (in dB) required to achieve the capacity of 10 bps/Hz is approximately

    • 22 dB
    • 28 dB
    • 30 dB
    • 35 dB
    Answer :- c

    2. The number of slots/subframe if the system uses a sub-carrier spacing of 60kHz

    Answer :- 4

    3. The system which is using incremental redundancy retransmission mode with an effective code rate of 3/4 did an initial transmission. But the receiver failed to successfully decode the data in first attempt and asked for 2 more retransmissions. Calulate the code rate at which the receiver was able to successfully decode the data

    • 1/4
    • 3/4
    • 3/8
    • 3/16
    Answer :- a

    4. The 5G system has been designed with the following specifications:
    (i) Bandwidth = 50 MHz, with usable bandwidth begin 49.5 MHz
    (ii) Subcarrier Spacing, ∆f = 15kHz
    (iii) Uses N = 4096 point FFT
    Calculate ceil(Sampling Rate/106)

    Answer :- 62

    5. The 5G system has been designed with the following specifications:
    (i) Bandwidth = 50 MHz, with usable bandwidth begin 49.5 MHz
    (ii) Subcarrier Spacing, ∆f = 15kHz
    (iii) Uses N = 4096 point FFT
    Calculate Slot Duration(in ms) ×Subframe Duration (in ms)

    Answer :- 10

    6. The 5G system has been designed with the following specifications:
    (i) Bandwidth = 50 MHz, with usable bandwidth begin 49.5 MHz
    (ii) Subcarrier Spacing, ∆f = 15kHz
    (iii) Uses N = 4096 point FFT

    Calculate the CP length of the first symbol if rest of the symbols in slot have a CP length of 288 samples.

    Answer :- 352

    7. The system uses a Modulation Scheme with the following specifications:

    Modulation Order = 2
    Target Code Rate (1024 x R) = 894

    Calculate it’s spectral efficiency

    • 0.8730
    • 1.7461
    • 1.8951
    • 1.9541
    Answer :- b
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