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 2 of 17

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Q11.
Which of the following is not a concern for antenna tradeoff?

a.

RF access

b.

Calibration

c.

Phase noise

d.

RF MEMS

Discuss
Answer: (d).RF MEMS Explanation:RF access, antenna calibration, phase noise are some parameters which influence antenna tradeoffs. The antenna establishes the available RF band and is responsible for the directional properties of the system.
Q12.
SPEAK easy aimed to developed a full band antenna that operated over the range ______

a.

2 MHz to 2000 MHz

b.

2 Hz to 2 MHz

c.

20 Hz to 2 MHz

d.

20 MHz to 2000 MHz

Discuss
Answer: (a).2 MHz to 2000 MHz Explanation:The RF range of 2 MHz to 2000 MHz was aimed to be achieved by SPEAKeasy. This falls in the range of 1000:1, it spans over 3 decades.
Q13.
What was the frequency range achieved by SPEAKeasy – 1?

a.

20 – 300 MHz

b.

5 – 300 MHz

c.

30 – 3000 MHz

d.

30 – 400 MHz

Discuss
Answer: (d).30 – 400 MHz Explanation:SPEAK easy split the operating range into three bands: 2 – 30 MHz; 30 – 400 MHz; and 400 – 2000 MHz. Band b was achieved by SPEAK easy – 1 and band a, b was achieved by SPEAKeasy – 2.
Q14.
Which of the following are frequency independent antennas?

a.

Dielectric rod and Yagi

b.

Log-periodic and Equiangular Spiral

c.

Half-wave dipole and Half-wave slot

d.

Axial mode helix and Pyramidal horn

Discuss
Answer: (b).Log-periodic and Equiangular Spiral Explanation:Log-periodic and Equiangular spiral antennas are frequency independent antennas. Log – periodic antenna operates over the range 10 MHz – 12 GHz. Equiangular spiral operates over the range 100 MHz – 35 GHz.
Q15.
Lower gain antenna reduces link margin and decreases the outage probability proportionally.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False Explanation:Lower gain antenna reduces link margin and increases the outage probability proportionally. These antennas become optimal when aggregate cost and quality of information services across the combination of bands and modes is considered.
Q16.
Which of the following option cannot be employed to overcome fading?

a.

Reduced channel symbol rates

b.

Diversity transmission and reception

c.

Decreased bandwidth

d.

Structured data

Discuss
Answer: (c).Decreased bandwidth Explanation:Increased instantaneous bandwidth for multipath resolution and equalization can mitigate the effect of fading. The reduction of channel symbol rate can reduce intersymbol interference. Diversity transmission and reception, and structuring of data provide resilience against fading.
Q17.
Which of the following can reduce the probability of non-recoverable fade depth?

a.

Diversity

b.

FEC

c.

Interleaving

d.

FEC and Interleaving

Discuss
Answer: (a).Diversity Explanation:Diversity transmission and reception can reduce the probability of non-recoverable fade depth. It tends to choose the signal with maximum strength, improving the error floor. FEC and interleaving are useful for compensating the erasure caused by fading.
Q18.
Doppler spread is given by _______

a.

carrier frequency times the ratio of maximum velocity of a transmitter divided by propagation velocity

b.

carrier frequency times the ratio of minimum velocity of a transmitter divided by propagation velocity

c.

carrier frequency times the ratio of propagation velocity divided by maximum velocity of a transmitter

d.

carrier frequency times the ratio of propagation velocity divided by minimum velocity of a transmitter

Discuss
Answer: (a).carrier frequency times the ratio of maximum velocity of a transmitter divided by propagation velocity Explanation:Doppler spread is given by carrier frequency times the ratio of maximum velocity of a transmitter divided by propagation velocity. Doppler spread is observed in the study of spatial coherence.
Q19.
The rule of thumb for antenna diversity states that for an antenna separation of 10 wavelengths or more, there is a considerable probability for the diversity signal to be substantially decorrelated from the primary signal.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True Explanation:Doppler spread introduces decorrelation as a function of antenna separation.The rule of thumb for antenna diversity states that for an antenna separation of 10 wavelengths or more, there is a considerable probability for the diversity signal to be substantially decorrelated from the primary signal.
Q20.
Cellular systems employ ____ sectorization.

a.

two way

b.

four way

c.

eight way

d.

three way

Discuss
Answer: (d).three way Explanation:The three way sectors are functionally distinct. Each sector is assigned with separate RF channels to satisfy high subscriber densities.
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