Cellular Systems

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Cellular systems”.

1. In the case of direct CDMA, interference will occur if the PN codes are
a) Orthogonal to each other
b) Non orthogonal to each other
c) Orthogonal & Non orthogonal to each other
d) None of the mentioned

2. If the active users using a cell doubles, the required Eb/I0
a) Doubles
b) Halves
c) Remains the same
d) None of the mentioned

3. In CDMA ______ frequency reuse is possible.
a) No
b) 50%
c) 90%
d) 100%

4. Bandwidth efficiency improvement involves
a) Dividing the geographical region into cells
b) Allowing frequency allocation
c) Dividing the geographical region into cells & Allowing frequency allocation
d) None of the mentioned

5. Which has more user capacity?
a) CDMA
b) AMPS
c) TDMA
d) None of the mentioned

6. Which technique is interference limited?
a) TDMA
b) CDMA
c) AMPS
d) None of the mentioned

7. Which technique is dimension limited?
a) TDMA
b) FDMA
c) TDMA & FDMA
d) None of the mentioned

8. Which type of channel does the forward link contain?
a) Paging
b) Pilot
c) Traffic
d) All of the mentioned

9. The types of channels that reverse channel contains are
a) Traffic
b) Access
c) Traffic & Access
d) None of the mentioned

10. The steps followed in forward channel CDMA includes
a) Modulo 2 addition
b) Channelization
c) Modulo 2 addition & Channelization
d) None of the mentioned

11. Walsh cover technique is used for
a) Channelization
b) Spreading
c) Channelization & Spreading
d) None of the mentioned

12. Short code is configured using ______ shift register.
a) 4-stage
b) 2-stage
c) 12-stage
d) 15-stage

13. How many channels are transmitted in the forward and reverse direction?
a) 1,64
b) 64,1
c) 2,32
d) 32,2

14. Which channel is more robust?
a) Forward channel
b) Reverse channel
c) Forward & Reverse channel
d) None of the mentioned

15. Which serves the hard hand-off process?
a) Base station
b) Mobile switching center
c) Mobile
d) None of the mentioned

16. Which serves the soft hand-off process?
a) Base station
b) Mobile switching center
c) Mobile
d) None of the mentioned

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