14-06-2012, 03:17 PM
GSM QUESTION PAPER
GSM QUESTION PAPER.doc (Size: 41 KB / Downloads: 120)
1. GSM working on three bands are
900 MHz
1800 MHz
1900 MHz PCS USA
2. Uplink frequency
890 – 915 MHz
Down frequency
935 - 960 MHz
3.Mulitiple access techniques used in GSM are
FDMA
TDMA
4. Data Frequency Used in GSM
25 MHz
5.Toatal Carriers Used in GSM
125 Carriers
6.Each Carrier Frequency in GSM
200KHz
7.Each Carrier data rate 270.
8 Kbps
9.Modulation used in GSM
GMSK (Gaussian Mean Shift Key)
10. Out of 125 carrier only one carrier called ARFCN and it is not used. Rest of the carriers are used .
11. 124 Carriers are divided to 4 GSM operators 124/4 = 31 carriers per GSM operator.
12.Bursting is the periodical switching.
13. GSM using same set of frequency between 2 cell areas.
14. Any mobile phone served by a cell area called mobile phone.
15. Cell pattern is a Group of cells
16.Cell pattern used in GSM
17. BSNL follows 7 cell pattern.
18. Group of cell is called cluster.
19.We must maintain co channel distance.
20.Carrier separation frequency 0.2MHz