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
View Answer
Explanation: If the PN codes are not purely orthogonal in direct CDMA interference will occur.
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
View Answer
Explanation: If the active users were to double, then the received Eb/I0 would essentially be halved.
3. In CDMA ______ frequency reuse is possible.
a) No
b) 50%
c) 90%
d) 100%
View Answer
Explanation: In CDMA, 100% frequency reuse can be employed.
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
View Answer
Explanation: The idea of dividing the geographical region into cells and allowing frequency allocation of one cell can be reused represents bandwidth efficiency improvement methods.
5. Which has more user capacity?
a) CDMA
b) AMPS
c) TDMA
d) None of the mentioned
View Answer
Explanation: CDMA has more user capacity compared to AMPS and TDMA.
6. Which technique is interference limited?
a) TDMA
b) CDMA
c) AMPS
d) None of the mentioned
View Answer
Explanation: CDMA technique capacity is interference limited.
7. Which technique is dimension limited?
a) TDMA
b) FDMA
c) TDMA & FDMA
d) None of the mentioned
View Answer
Explanation: TDMA and FDMA capacity is dimension limited.
8. Which type of channel does the forward link contain?
a) Paging
b) Pilot
c) Traffic
d) All of the mentioned
View Answer
Explanation: The forward link contains different types of channels such as paging, pilot, synchronization and traffic.
9. The types of channels that reverse channel contains are
a) Traffic
b) Access
c) Traffic & Access
d) None of the mentioned
View Answer
Explanation: The reverse channel contains two types of channels – traffic and access.
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
View Answer
Explanation: Forward channel CDMA includes steps like modulo 2 addition, channelization, and base station identification.
11. Walsh cover technique is used for
a) Channelization
b) Spreading
c) Channelization & Spreading
d) None of the mentioned
View Answer
Explanation: Walsh cover is used for channelization plus spreading.
12. Short code is configured using ______ shift register.
a) 4-stage
b) 2-stage
c) 12-stage
d) 15-stage
View Answer
Explanation: The code in the forward direction, short code is designed using 15 stage shift register.
13. How many channels are transmitted in the forward and reverse direction?
a) 1,64
b) 64,1
c) 2,32
d) 32,2
View Answer
Explanation: In forward direction 64 channels are transmitter and in reverse direction, only one channel is transmitted.
14. Which channel is more robust?
a) Forward channel
b) Reverse channel
c) Forward & Reverse channel
d) None of the mentioned
View Answer
Explanation: Forward channel is more robust than the reverse channel.
15. Which serves the hard hand-off process?
a) Base station
b) Mobile switching center
c) Mobile
d) None of the mentioned
View Answer
Explanation: Mobile unit continuously scans for stronger pilot and provides and serves hand off process.
16. Which serves the soft hand-off process?
a) Base station
b) Mobile switching center
c) Mobile
d) None of the mentioned
View Answer
Explanation: Soft hand off process is served by the mobile. It scans for stronger pilot and requests handoff to base station.
Sanfoundry Global Education & Learning Series – Digital Communications.
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