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.

In this section, you'll find a wide range of Technology Tradeoffs in Software Defined Radio mcq questions that explore various aspects of Technology Tradeoffs in Software Defined Radio problems. Each MCQ is crafted to challenge your understanding of Technology Tradeoffs in Software Defined Radio principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Cognitive Radio tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Technology Tradeoffs in Software Defined Radio MCQs are your pathway to success in mastering this essential Cognitive Radio topic.

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Technology Tradeoffs in Software Defined Radio MCQs | Page 7 of 17

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Q61.
Which of the following is the first step in establishing acceptable aliasing power?

a.

Establish the relation between CIR and BER

b.

Fix BER threshold

c.

Convert BER threshold to CIR threshold

d.

Apply the instantaneous dynamic range requirement of ADC

Discuss
Answer: (b).Fix BER threshold Explanation:The first step in establishing acceptable aliasing power is to fix the BER threshold based on QOS requirements of the waveform. The second step is to establish a relationship between CIR and BER. Then the BER threshold is converted to CIR threshold. The fourth and the final step is to apply the instantaneous dynamic range requirement of ADC.
Q62.
Noise must be less than _____ of the ADC.

a.

half of the LSB

b.

LSB

c.

half of the MSB

d.

MSB

Discuss
Answer: (a).half of the LSB Explanation:The effect of aliasing, spurious response in IF/RF processing and other noise must be less than half of the least significant bit of the ADC. If this condition is satisfied, then all the bits of ADC give only the useful signal power.
Q63.
To avoid aliasing, the wideband ADC is ____ by anti-aliasing filters to suitably alter the _____ waveform.

a.

succeeded, digital

b.

preceded, digital

c.

succeeded, analog

d.

preceded, analog

Discuss
Answer: (d).preceded, analog Explanation:Aliasing prevents faithful restoration of the signal. To avoid aliasing, the wideband ADC is preceded by anti-aliasing filters to suitably alter the analog waveform. The filters must have satisfactory stop-band attenuation.
Q64.
The shape factor of an anti-aliasing filter is given by the ratio of the frequency at ___ dB attenuation point to the frequency at ___ dB point.

a.

80, 3

b.

3, 80

c.

-80, -3

d.

-3, -80

Discuss
Answer: (c).-80, -3 Explanation:Anti -aliasing filters require large shape factor for suppression of signals closer to the upper band-edge of ADC passband. The shape factor of an anti-aliasing filter is given by the ratio of the frequency at -80 dB attenuation point to the frequency at -3 dB point.
Q65.
Which among the following filters has the slowest roll-off?

a.

Cauer

b.

Chebychev

c.

Butterworth

d.

Bessel

Discuss
Answer: (d).Bessel Explanation:Bessel function has the slowest roll-off factor among the four filters. The approximate value of shape factor is 6. It is a monotonic filter.
Q66.
Which of the following expressions give the relation between power and quantization step size (q)?

a.

p=q²/2R

b.

p=q/2R

c.

p=q²/R

d.

p=q²*2R

Discuss
Answer: (a).p=q²/2R Explanation:p=q²/2R is the relation between power and quantization step size. R is the input resistance.
Q67.
Which of the following expressions give the SNR at the output of ADC?

a.

SNR=6.02*B+1.76+10log(fs/2fmax)

b.

SNR=6.02*B+1.76+10log(2fmax/fs)

c.

SNR=12.04*B+1.76+10log(2fmax/fs)

d.

SNR=6.02*B+1.76

Discuss
Answer: (a).SNR=6.02*B+1.76+10log(fs/2fmax) Explanation:SNR=6.02*B+1.76+10log(fs/2fmax) is the expression for SNR at the output of ADC. B is the number of bits. fs is the sampling frequency. fmax is the maximum frequency component of the signal.
Q68.
In non-monotonic filters, attenuation increases with frequency.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False Explanation:In monotonic filters, attenuation increases with frequency. Non-monotonic filter has less attenuation. It allows energy beyond the passband and exhibits phase distortion.
Q69.
Which of the following is untrue about Sigma-Delta ADC?

a.

fs>2fmax

b.

Zero crossing detector consists of a sample and hold circuit

c.

Aperture jitter is minimized due to integration

d.

The integrating filter is preceded by a zero crossing detector

Discuss
Answer: (b).Zero crossing detector consists of a sample and hold circuit Explanation:Sigma-Delta ADC does not require a sample and hold circuit. The zero-crossing detector can be implemented by threshold logic.
Q70.
Quadrature sampling uses ____ to ____ the bandwidth available for a particular sampling rate.

a.

integration, quadruple

b.

complex numbers, quadruple

c.

complex numbers, double

d.

integration, double

Discuss
Answer: (c).complex numbers, double Explanation:Quadrature sampling uses complex numbers to double the bandwidth available for a particular sampling rate. It is a polyphase filter. Real signals are combined with cosine and sine reference signal generated by a local oscillator.
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