Spread Spectrum Multiple Access MCQ’s

Electronics & Communication Engineering Wireless & Mobile Communications

This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Spread Spectrum Multiple Access”.

1. PN sequence converts _______ signal to ______ signal.
a) Narrowband, wideband
b) Wideband, narrowband
c) Unmodulated, modulated
d) Low frequency, high frequency

2. SSMA is bandwidth efficient when used with a single user.
a) True
b) False

3. SSMA uses signals which have a transmission bandwidth that is smaller than the minimum required RF bandwidth.
a) True
b) False

4. ___________ is a digital multiple access system in which carrier frequencies are varied in pseudorandom order.
a) CDMA
b) FCDMA
c) FHMA
d) SDMA

5. A frequency hopped system does not provide security.
a) True
b) False

6. If the rate of change of the carrier frequency is greater than the symbol rate, then the system is referred as ___________
a) Fast frequency hopping system
b) Slow frequency hopping system
c) Time division frequency hopping system
d) Code division multiple access system

7. All users in CDMA system uses __________ carrier frequency.
a) Different
b) Two
c) Ten
d) Same

8. In CDMA, symbol duration is ___________ than channel delay spread.
a) Equal
b) Greater
c) Slightly greater
d) Much less

9. ___________ problem occurs when many mobile users share the same channel.
a) Near-far
b) Activation
c) Line of sight
d) Windowing

10. ____________ arises from the fact that the spreading sequences of different users are not orthogonal.
a) Near-far problem
b) Line of sight
c) Windowing
d) Self jamming

11. ____________ is used to improve reception by collecting time delayed versions of the required signal.
a) RAKE receiver
b) Equalizer
c) Frequency modulator
d) High pass filter

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