Spread Spectrum and CDMA

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Processing gain is the ratio of message bandwidth to signal bandwidth.
True
False
Explanation:
Processing gain is the ratio of signal bandwidth to message bandwidth.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
CDMA uses
Hard hand off
Soft hand off
Hard & Soft hand off
None of the mentioned
Explanation:
CDMA uses soft hand off which provides more reliable communication.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
CDMA rejects
Narrow band interference
Wide band interference
Narrow & Wide band interference
None of the mentioned
Explanation:
CDMA effectively rejects narrow band interference.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Frequency planning is very essential in
FDMA
TDMA
FDMA & TDMA
None of the mentioned
Explanation:
Frequency planning is necessary for both TDMA and FDMA.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which is more bandwidth efficient?
Direct sequence spread spectrum
Frequency hopping spread spectrum
Time hopping spread spectrum
None of the mentioned
Explanation:
Time hopping spread spectrum is more bandwidth efficient.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Some advantages of spread spectrum are
Low susceptibility
Immunity to jamming
Reduced interference
All of the mentioned
Explanation:
Advantages of spread spectrum are low susceptibility, reduced interference, immunity to jamming and co existence of multi path system.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which uses orthogonal codes?
Synchronous CDMA
Asynchronous CDMA
Synchronous & Asynchronous CDMA
None of the mentioned
Explanation:
Synchronous CDMA uses orthogonal codes and asynchronous CDMA uses pseudorandom codes.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which is more suitable when large number of transmitters are used?
Synchronous CDMA
Asynchronous CDMA
Synchronous & Asynchronous CDMA
None of the mentioned
Explanation:
Asynchronous CDMA is more suitable for large number of transmitters.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which is better for avoiding jamming?
Direct sequence spread spectrum
Frequency hopping spread spectrum
Time hopping spread spectrum
None of the mentioned
Explanation:
Frequency hopping spread spectrum is better for avoiding jamming.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which is more simpler to implement?
Direct sequence spread spectrum
Frequency hopping spread spectrum
Time hopping spread spectrum
None of the mentioned
Explanation:
Direct sequence spread spectrum is more simpler to implement.