Spread Spectrum

Digital Communications Systems

This set of Digital Communication Problems focuses on “Spread Spectrum “.

1. Spread spectrum is a ______ technique.
a) Encoding
b) Decoding
c) Encoding & Decoding
d) None of the mentioned

2. Spread spectrum can be used to transmit
a) Analog data
b) Digital data
c) Analog & Digital data
d) None of the mentioned

3. Spread spectrum makes ______ difficult.
a) Jamming
b) Interception
c) Jamming & Interception
d) None of the mentioned

4. Spread spectrum has immunity from
a) Noise
b) Multi-path distortion
c) Noise & Multi-path distortion
d) None of the mentioned

5. The width of each channel in frequency hopping spread spectrum corresponds to
a) Bandwidth of input signal
b) Pseudorandom sequence used
c) Carrier frequency
d) None of the mentioned

6. The transmitter of frequency hopping system is fed with encoding scheme such as
a) Frequency shift keying
b) Binary phase shift keying
c) Frequency & Binary phase shift keying
d) None of the mentioned

7. Which filter is used to get the final FHSS signal?
a) Low pass filter
b) High pass filter
c) Band pass filter
d) Band stop filter

8. In CDMA the incoming signal is _____ with the spreading code.
a) Added
b) Multiplied
c) XOR-ed
d) None of the mentioned

9. The original bandwidth of the unspread signal in spread spectrum is ____ to data rate.
a) Proportional
b) Inversely proportional
c) Not related
d) None of the mentioned

10. In DSSS the signal is recovered using
a) Low pass filter
b) High pass filter
c) Band pass filter
d) Band stop filter

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