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Cognitive Radio
Advanced Cognitive Radio
Quiz 1
Solution
Q.1.
Which among the following is an advantage of using Fast Fourier Transform (FFT) for spectrum sensing?
a) Analysis of computation complexity in the FFT window
b) Analysis of phase in the FFT window
c) Analysis of period enclosed in the FFT window
d) Analysis of frequencies enclosed in the FFT window
Q.2.
Which among the following is not a limitation of employing FFT?
a) Wideband ADC is required
b) Restriction on bandwidth
c) Increased energy demand
d) High delay
Q.3.
Which among the following parameters do not exhibit better performance in the spectrum analyzer when compared to the FFT technique?
a) Complexity
b) Bandwidth
c) Short signal detection
d) Power
Q.4.
Which among the following is accomplished by sampling sub-Nyquist in wideband FFT spectrum sensing?
a) Reduction of complexity
b) Improved signal detection
c) Reduced power consumption
d) Shorter time delay
Q.5.
Which among the following layers have a similar impact due to interference caused by primary user transmission?
a) Physical layer and MAC layer
b) MAC layer and network layer
c) Network layer and Transport layer
d) Transport layer and Physical layer
Q.6.
Which among the following is the impact of primary user interference in the physical layer?
a) High bit error rate
b) High delay
c) High collision
d) High energy demand
Q.7.
Which among the layers fail to route a packet due to primary user interference?
a) Physical layer
b) Data link layer
c) Network layer
d) Transport layer
Q.8.
Which among the following is the impact of having poor spur free dynamic range?
a) Difficulty in short signal detection
b) Overloading
c) Additive noise
d) High complexity
Q.9.
Which among the following results in low sensitivity?
a) Poor collision mitigation mechanism
b) Poor signal processing
c) Poor noise figure
d) Poor linear noise amplifier performance
Q.10.
Under good propagation conditions, increasing the transmission energy is a poor technique to increase spectrum efficiency.
a) True
b) False
Q.11.
Which among the following statements holds true about the give graph?
a) The energy required per bit increases exponentially with exponential increase in bits per Hertz
b) The energy required per bit increases linearly with exponential increase in bits per Hertz
c) The energy required per bit increases linearly with linear increase in bits per Hertz
d) The energy required per bit increases exponentially with linear increase in bits per Hertz
Q.12.
Which among the following may be implemented to reduce the amount of assumption about interference?
a) Installing multiple sensors to observe the same transmission
b) Developing multiple channel models
c) Developing multiple signal propagation models
d) Installing multiple resource managers
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