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Mark |
Mobile Communications - examination paper (set A)
1 |
Complete the diagram so that it explains call setup sequence from PSTN/ISDN to MS.
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Explain acronyms that you use to annotate the diagram: |
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2 |
How path attenuation in the two-ray model depends on the distance d? What properties of the ground are typically assumed in this model, and how phase and amplitude of the wave reflected from it change?
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3 |
In free space there is a transmitting and a receiving antenna, both with gain GT = GR = 0 dBi. The antennas are located d = 1000 km one from another. Transmit power is PT = 1 W and carrier frequency f = 30 MHz. What is the received power in W, dbW, dBm?
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4 |
Sketch the GSM normal burst. Name its components, duration, and number of bits.
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5 |
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6 |
Explain timing advance technique:
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7 |
First NMT450 system was launched in: ð 1970 ð 1976 ð 1981 ð 1983 |
If VSWR = 0.5 then reflection coefficient r =: ð 0.2 ð 12 ð 1.5 ð 0.1 |
If ERP = 30 dBm then EIRP =
ð 30.15 dBm ð 27.85 dBm ð 30.15 dBm |
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8 |
Calculate the minimum number of cells in a cluster to achieve the C/I ratio of 9 dB for the path attenuation exponent n=4. Consider two cases, i.e. with and without 120º sectorisation. Use simplified formulas for C/I ratio.
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9 |
Which techniques used in the GSM allow to save energy in Mobile Stations:
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