Software Defined Radio Architecture MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Software Defined Radio Architecture, 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 Software Defined Radio Architecture 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 Software Defined Radio Architecture mcq questions that explore various aspects of Software Defined Radio Architecture problems. Each MCQ is crafted to challenge your understanding of Software Defined Radio Architecture 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 Software Defined Radio Architecture MCQs are your pathway to success in mastering this essential Cognitive Radio topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Software Defined Radio Architecture. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

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Software Defined Radio Architecture MCQs | Page 1 of 13

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Q1.
Smart antenna integrates the contributions of _____ antenna elements.

a.

band distributed

b.

band centralized

c.

spatially distributed

d.

spatially centralized

Discuss
Answer: (c).spatially distributed Explanation:Smart antenna integrates the contributions of spatially centralized antenna elements. Frequency reuse and co-channel suppression characteristics of smart antenna provide wireless communication systems with large capacity and high quality links.
Q2.
If a multibeam array has ____, it may not be feasible to assign a complete frequency-reuse plan to each beam.

a.

a single beam

b.

two beams

c.

less than five beams

d.

more than ten beams

Discuss
Answer: (d).more than ten beams Explanation:If a multibeam array has more than ten beams, it may not be feasible to assign a complete frequency-reuse plan to each beam. This is due to the interference with adjoining sectorized antennas.
Q3.
Interference with adjoining sectorized antennas can be avoided by _____

a.

frequency nulling

b.

spatial nulling

c.

spatial beam-forming

d.

frequency beam-forming

Discuss
Answer: (b).spatial nulling Explanation:The interference with adjoining sectorized antenna can be avoided by the introduction of spatial nulls in the direction of nonsubscriber signal components. In high traffic intensity areas, nulls track subscribers that are on the same frequency and cancel their path movements.
Q4.
Spatial nulling subsystem replaces three element sectors of conventional base station with ____ disposed antenna elements.

a.

four spherically

b.

eight spherically

c.

four circularly

d.

eight circularly

Discuss
Answer: (d).eight circularly Explanation:Spatial nulling subsystem replaces three element sectors of conventional base station with eight circularly disposed antenna elements. The signal is then preamplified and converted to digital form using eight wideband ADCs.
Q5.
In the context of smart antenna, SAT stands for _____

a.

Scholastic Assessment Test

b.

Site Acceptance Test

c.

Saturation

d.

Supervisory Audio Tones

Discuss
Answer: (d).Supervisory Audio Tones Explanation:The out-of-band Supervisory Audio Tones generated by the basestation is relayed in the mobile. The base station can therefore differentiate its subscribers from cochannel interference based on SAT.
Q6.
_____ process determines delay azimuth parameters.

a.

Stationary

b.

Auto correlation

c.

Cross correlation

d.

Convolution

Discuss
Answer: (c).Cross correlation Explanation:Cross correlation process determines delay azimuth parameters needed for the final beam forming-equalization stage. The resulting signal exhibits enhanced carrier to interference ratio.
Q7.
Which of the following statements is false regarding the spatial distribution of a wavefront?

a.

Multipath components are collinear with direct path

b.

Multipath components have less signal strength than direct path

c.

Multipath components are present

d.

Multipath components exhibit time delay

Discuss
Answer: (a).Multipath components are collinear with direct path Explanation:Multipath components exhibit delay with respect to main components. They are not collinear with direct path. They have less signal strength than direct path. When interference is present, it tends to mix with multipath components.
Q8.
In space-time adaptive processing, _____ and equalization parameters are calculated _____

a.

diversity, jointly

b.

diversity, independently

c.

beamforming, jointly

d.

beamforming, independently

Discuss
Answer: (c).beamforming, jointly Explanation:Space-time adaptive processing involves two-dimensional filtering technique using a phased array antenna with multiple spatial channels. In space-time adaptive processing, beamforming and equalization parameters are calculated jointly.
Q9.
In ____, the interference has difference placement on the long-code.

a.

GSM

b.

AMPS

c.

CDMA

d.

FDMA

Discuss
Answer: (c).CDMA Explanation:Cellular systems employ different techniques to differentiate subscriber signal from co-channel interference. In the case of CDMA, the interference has a different placement on the long-code. In the case of GSM, the burst has different header bits.
Q10.
____ is a method used for calculating beamforming weights.

a.

Sample matrix inversion

b.

Indirect matrix inversion

c.

Convolution

d.

Correlation

Discuss
Answer: (a).Sample matrix inversion Explanation:Sample matrix inversion or direct matrix inversion is a method used for calculating beamforming weights based on a known training sequence of length L. Adaptive algorithms iterate the weights in accordance to the received training sequence. A final estimate is obtained at the end of the training sequence.
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