28-08-2013, 04:54 PM
Mid Phase Exam(Questions)
Mid Phase Exam(.pdf (Size: 255.84 KB / Downloads: 21)
1. TACS, NMT, C-45 these belongs to______
a) 1G
b) 2G
c) 3G
d) All of these
2. Uplink & Downlink frequencies for GSM 1900 band__________
3. Carrier separation for GSM is________
4. Match the following-
Column A
Column B
1) Carrier width
a) TDMA
2) Duplexing
b) GMSK
3) Multiplexing
c) FDD
4) Modulation
d) 0.20MHz
5) Maximum data rate
e) About 12kbps
6) End user data rate
f) 9.6 to 14.4 kbps
5. The call volume offered to an MSC depends on geographical area class of service mix and
time of day.
a) True
b) False
6. Define the following-
a) Calling rate:
b) Call holding time:
c) Busy hour:
d) Blocking probability/GoS:
e) ABR:
f)
ASR:
7. Write expression for-
a) Erlang B:
b) Erlang C:
8. Shadow effect is described by zero mean Gaussian random Variable.
a) True
b) False
9. Time dispersion leads to________
a) ISI
b) BER
c) Both
d) None of these
10. When the channel changes are higher than the modulated symbol rate then slow fading
occurs.
a) True
b) False
11. Assume the speed of vehicle is equal to 60 miles/hr carrier frequency 860 MHz,
Td=2μS.Calculate –
a) Coherence time:
b) Coherence BW:
12. At coded symbol rate of 19.2kbps what kind of symbol distortion will be experienced by the
channel?
13. The statistical time varying nature of the received envelop of a flat fading signal OR the
envelop of an individual multipath component is described by-
a) Rician
b) Rayleigh
c) Log normal
d) None of these
14. Mobile station travelling at a speed of 60Kmph transmitted at 900MHz. If it
receives/transmits data rate at the rate of 64kbps is the channel fading slow or fast?
15. A suburb has an area of 1500miles2 and is covered by cellular system that uses ‘7’ reuse
pattern each cell has radius of 4 miles & city is allocated 50MHz of spectrum of full duplex
channel of BW 60kHz assuming GoS 2% for an Erlang B System & a traffic load per user of
0.003 Erlang. Calculate-
i.Number of cell in service area
ii.Number of channels per cell
iii.Maximum carrier traffic
iv.Traffic intensity of each cell
v.Total no. of user that can be served for 2% GoS
vi.Number of mobile per channel.