GATE 2015 EC – Question 60
The transmitted signal in a GSM system is of 200 kHz bandwidth and 8 users share a common bandwidth using TDMA. If at a given time 12 users are talking in a cell, the total bandwidth of the signal received by the base station of the cell will be at least (in kHz) ________.
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Correct answer: 400
Explanation
One 200 kHz carrier supports 8 users by time sharing. Twelve users need 2 carriers, since $\lceil \frac{12}{8} \rceil = 2$, so the total bandwidth is $2 \times 200 = 400$ kHz.