Spread Spectrum and CDMA

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Spread spectrum and CDMA”.

1. Some advantages of spread spectrum are
a) Low susceptibility
b) Immunity to jamming
c) Reduced interference
d) All of the mentioned
View AnswerAnswer: d

2. Processing gain is the ratio of message bandwidth to signal bandwidth.
a) True
b) False

3. Which is better for avoiding jamming?
a) Direct sequence spread spectrum
b) Frequency hopping spread spectrum
c) Time hopping spread spectrum
d) None of the mentioned

4. Which is more bandwidth efficient?
a) Direct sequence spread spectrum
b) Frequency hopping spread spectrum
c) Time hopping spread spectrum
d) None of the mentioned

5. Which is more simpler to implement?
a) Direct sequence spread spectrum
b) Frequency hopping spread spectrum
c) Time hopping spread spectrum
d) None of the mentioned

6. Which uses orthogonal codes?
a) Synchronous CDMA
b) Asynchronous CDMA
c) Synchronous & Asynchronous CDMA
d) None of the mentioned

7. Which is more suitable when large number of transmitters are used?
a) Synchronous CDMA
b) Asynchronous CDMA
c) Synchronous & Asynchronous CDMA
d) None of the mentioned

8. CDMA rejects
a) Narrow band interference
b) Wide band interference
c) Narrow & Wide band interference
d) None of the mentioned

9. Frequency planning is very essential in
a) FDMA
b) TDMA
c) FDMA & TDMA
d) None of the mentioned

10. CDMA uses
a) Hard hand off
b) Soft hand off
c) Hard & Soft hand off
d) None of the mentioned

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