Spread Spectrum

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The transmitter of frequency hopping system is fed with encoding scheme such as
Frequency shift keying
Binary phase shift keying
Frequency & Binary phase shift keying
None of the mentioned
Explanation:
For transmission, the binary data is fed into modulator using modulation scheme such as frequency shift keying or binary phase shift keying.
Question 2
Marks : +2 | -2
Pass Ratio : 50%
Spread spectrum is a ______ technique.
Encoding
Decoding
Encoding & Decoding
None of the mentioned
Explanation:
Spread spectrum is an important encoding technique for a wireless communication system.
Question 3
Marks : +2 | -2
Pass Ratio : 50%
In DSSS the signal is recovered using
Low pass filter
High pass filter
Band pass filter
Band stop filter
Explanation:
In direct sequence spread spectrum, band pass signal at the demodulator can be used to recover the original signal.
Question 4
Marks : +2 | -2
Pass Ratio : 50%
The original bandwidth of the unspread signal in spread spectrum is ____ to data rate.
Proportional
Inversely proportional
Not related
None of the mentioned
Explanation:
In spread spectrum, the original bandwidth of the unspread signal is proportional to the data rate.
Question 5
Marks : +2 | -2
Pass Ratio : 50%
Spread spectrum has immunity from
Noise
Multi-path distortion
Noise & Multi-path distortion
None of the mentioned
Explanation:
Spread spectrum has immunity to noise and multi-path distortion.
Question 6
Marks : +2 | -2
Pass Ratio : 50%
Spread spectrum makes ______ difficult.
Jamming
Interception
Jamming & Interception
None of the mentioned
Explanation:
Spread spectrum makes jamming and interception difficult and provides improved reception.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
In CDMA the incoming signal is _____ with the spreading code.
Added
Multiplied
XOR-ed
None of the mentioned
Explanation:
In CDMA, the incoming signal is multiplied with the spreading code.
Question 8
Marks : +2 | -2
Pass Ratio : 50%
Which filter is used to get the final FHSS signal?
Low pass filter
High pass filter
Band pass filter
Band stop filter
Explanation:
Band pass filter is used to block difference frequency and allow the sum frequency to yield final FHSS signal.
Question 9
Marks : +2 | -2
Pass Ratio : 50%
The width of each channel in frequency hopping spread spectrum corresponds to
Bandwidth of input signal
Pseudorandom sequence used
Carrier frequency
None of the mentioned
Explanation:
The width of the channel in frequency hopping spread spectrum corresponds to bandwidth of the input signal.
Question 10
Marks : +2 | -2
Pass Ratio : 50%
Spread spectrum can be used to transmit
Analog data
Digital data
Analog & Digital data
None of the mentioned
Explanation:
Spread spectrum is used to transmit analog data and digital data using analog signal.