Technology Tradeoffs in Software Defined Radio MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Technology Tradeoffs in Software Defined Radio, a fundamental topic in the field of Cognitive Radio. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Technology Tradeoffs in Software Defined Radio MCQs are designed to help you grasp the core concepts and excel in solving problems.

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Technology Tradeoffs in Software Defined Radio MCQs | Page 9 of 17

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Q81.
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

Discuss
Answer: (b).desired signal bandwidth is approximately equal to Nyquist bandwidth Explanation:Signal to noise ratio is the preferred metric for ADC performance when the desired signal bandwidth is approximately equal to Nyquist bandwidth. Radar matched filter is an example for this condition. The matched filter optimally operates with the square shape of the radar pulses.
Q82.
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

Discuss
Answer: (b).Spurious Free Dynamic Range (SFDR) Explanation:Spurious Free Dynamic Range is the preferred metric when the desired signal bandwidth is less than Nyquist bandwidth. First generation cellular base station is an example for this condition. The AMPS signal is much smaller in bandwidth when compared to the spectrum allocation accessed by a cell site ADC.
Q83.
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

Discuss
Answer: (c).spectral density outside, maximum spectral density inside Explanation:The ratio of spectral density outside the notch filter to the maximum spectral density inside the notch filter gives the Noise Power Ratio. Noise Power Ratio is the preferred metric when the number of narrow band channels in the signal spectrum is high. It is measured by flooding the Nyquist bandwidth with white noise.
Q84.
If Wₐ is 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

Discuss
Answer: (b).Pₘ=-174dBm+10log(Wₐ)+NF Explanation:If Wₐ is the receiver bandwidth and NF is the noise figure, the noise power of a noise limited receiver is given by the expression Pm=-174dBm+10log(Wa)+NF. The noise power of the noise limited receiver must be matched to power of the least significant bit of ADC.
Q85.
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

Discuss
Answer: (b).Wideband digital receiver Explanation:Spurious Free Dynamic Range is used in wideband digital receiver to quantify the reliability of detection of weak signals in the presence of strong in-band interference.
Q86.
Which of the following metrics is considered for spread spectrum method?

a.

SNR

b.

SNR, SFDR

c.

SNR, SFDR, NPR

d.

SNR, NPR

Discuss
Answer: (c).SNR, SFDR, NPR Explanation:Spread spectrum uses SNR, SFDR and NPR for performance analysis. SNR is affected by small signals in an environment of strong interference. SFDR is degraded due to spatial filtering. NPR is affected by inter-channel cross talk.
Q87.
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

Discuss
Answer: (d).High dynamic range Explanation:SNR is affected by small signals in an environment of strong interference in spread spectrum technique. Wide band channelized receiver affect SNR in Mobile Cellular applications. In spectrum analysis, SNR is influenced by high-fidelity instrumentation
Q88.
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

Discuss
Answer: (b).10 MHz – 100 MHz Explanation:The sampling rate of promising SDR technology ranges between 10 MHz – 100 MHz. The resolution falls in the range of 30 dB– 60 dB. Frequency division multiplexing uses few MHz IF-bandwidth. PCM, cellular band allocation, 3G, and air navigation signals use hundreds of MHz.
Q89.
The NPR for an SDR can be determined by matching the radio noise floor to the ADC input noise level.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False Explanation:The SNR and DNR can be determined by matching the radio noise floor to the ADC input noise level. This imposes the design rule that the total noise power should be less than half of the least significant bit of ADC. The ratio of spectral density outside the notch filter to the maximum spectral density inside the notch filter gives the Noise Power Ratio.
Q90.
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

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False Explanation:The increase in the third-order intermodulation product eventually results in the intersection of the fundamental signal with the power of third-order intermodulation product. This is referred as IP3. The output power of the fundamental signal saturates before IP3.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 compression point.
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