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Cognitive Radio
Software Defined Radio Basic
Quiz 1
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Q.1
Which of the following is not a part of traditional RF subsystems?
a) Filter
b) Low noise amplifier
c) Multiplexer
d) Frequency translation
Q.2
Limited dynamic range in digital RF system can be improved by _____
a) digital filter
b) digital amplifier
c) digital equalizer
d) digital suppressor
Q.3
____ and ____ are the parameters that define software defined radio applications.
a) Linearity, SNR
b) Dynamic range, SNR
c) Linearity, Dynamic range
d) Bandwidth, SNR
Q.4
Which of the following influences the spurious free dynamic range?
a) Second-order intercept
b) Second-order intermodulation product
c) Third-order intercept
d) Third-order intermodulation product
Q.5
The point of intersection of the fundamental signal with the power of third-order intermodulation product is called as _____
a) input-referenced third-order intercept point
b) output-referenced third-order intercept point
c) input-referenced third-order intermodulation point
d) output-reference third-order intermodulation point
Q.6
Signal to noise ratio is the preferred metric when ____
a) desired signal bandwidth is less than Nyquist bandwidth
b) desired signal bandwidth is approximately equal to Nyquist bandwidth
c) desired signal bandwidth is greater than Nyquist bandwidth
d) bandpass sampling is used
Q.7
Which of the following is the preferred metric when the desired signal bandwidth is less than Nyquist bandwidth?
a) Noise Power Ratio
b) Spurious Free Dynamic Range (SFDR)
c) Full Power Analog Input Bandwidth
d) Half Power Analog Input Bandwidth
Q.8
The ratio of ______ the notch filter to the ____ the notch filter gives the Noise Power Ratio.
a) maximum spectral density inside, spectral density outside
b) spectral density inside , maximum spectral density outside
c) spectral density outside, maximum spectral density inside
d) maximum spectral density outside, spectral density inside
Q.9
If Wais the receiver bandwidth and NF is the noise figure, the noise power of a noise limited receiver is given by the expression ____
a) Pm=-184dBm+10log(Wa)+NF
b) Pm=-174dBm+10log(Wa)+NF
c) Pm=-174dBm+10log(NF)+Wa
d) Pm=-184dBm+10log(NF)+Wa
Q.10
Which of the following applications takes only SFDR as its performance metric?
a) Spread spectrum access
b) Wideband digital receiver
c) Cellular Phone
d) Spectrum analysis
Q.11
Which of the following metrics is considered for spread spectrum method?
a) SNR
b) SNR, SFDR
c) SNR, SFDR, NPR
d) SNR, NPR
Q.12
Which of the following conditions does not affect SNR?
a) Small signals in an environment of strong interference
b) Wide band channelized receiver
c) High fidelity instrumentation
d) High dynamic range
Q.13
The sampling rate of promising SDR technology ranges between _____
a) 1 MHz – 100 MHz
b) 10 MHz – 100 MHz
c) 1 MHz – 1 GHz
d) 1 MHz – 10 GHz
Q.14
The NPR for an SDR can be determined by matching the radio noise floor to the ADC input noise level.
a) True
b) False
Q.15
The point at which the output noise power of the fundamental signal shifts away from the ideal output power by 1-dB is called 1-dB expansion point.
a) True
b) False
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