Next Generation Wireless Network MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Next Generation Wireless Network, 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 Next Generation Wireless Network 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 Next Generation Wireless Network mcq questions that explore various aspects of Next Generation Wireless Network problems. Each MCQ is crafted to challenge your understanding of Next Generation Wireless Network 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 Next Generation Wireless Network 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 Next Generation Wireless Network. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Next Generation Wireless Network knowledge to the test? Let's get started with our carefully curated MCQs!

Next Generation Wireless Network MCQs | Page 4 of 33

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Q31.
Which among the following is the most practical method to identify spectrum holes?

a.

Detect primary user transmission

b.

Detect primary user receiving information

c.

Detect secondary user transmission

d.

Detect secondary user receiving information

Discuss
Answer: (a).Detect primary user transmission Explanation:The detection of primary users receiving information within the communication range of xG users is considered as the most efficient means for determining spectrum holes. However this is not always feasible as it is laborious to measure the channel between a transmitter and a primary receiver. Hence sensing is predominantly carried out by detecting the transmission operation of primary users.
Q32.
Which among the following is not a transmission detection technique?

a.

Matched filter detection

b.

Energy detection

c.

Cyclostationary detection

d.

Interference based detection

Discuss
Answer: (d).Interference based detection Explanation:Transmission detection is based on the identification of weak signals sent by the primary transmitter obtained by the local observations of the xG users. Transmitter detection is also known as non-cooperative method. Interference based detection and cooperation detection are other spectrum sensing techniques.
Q33.
What is the terminology used to represent the absence of a licensed user in the spectrum?

a.

Grounded hypothesis

b.

Fixed hypothesis

c.

Null hypothesis

d.

Zero hypothesis

Discuss
Answer: (c).Null hypothesis Explanation:The following equation represents the basic hypothesis model for transmitter detection,
s(t) = n(t) [U1]
s(t) = a*i(t) + n(t) [U2]
where s(t) is the signal available at the xG user, i(t) is the signal transmitted by the primary user, n(t) is the AWGN, and a is the amplitude gain of the channel.
U1 is the null hypothesis which indicates the absence of signals from the licensed users in the spectrum band. U2 is termed alternate hypothesis which indicates the presence of signals from the licensed users in the spectrum band.
Q34.
Which among the following techniques requires prior knowledge of the primary signal?

a.

Matched filter detection

b.

Energy detection

c.

Cooperation detection

d.

Cyclostationary detection

Discuss
Answer: (a).Matched filter detection Explanation:The matched filter detection method requires prior knowledge of the signal to be transmitted by the primary user such as the pulse shape, the packet format, and the order and modulation type. If the information is available, then the matched filter is the most compatible detection method. Matched filter can maximize the signal to noise ratio.
Q35.
What is the advantage of using matched filter detection?

a.

Rapid increase in processing gain

b.

Simultaneous detection

c.

High accuracy

d.

Low power consumption

Discuss
Answer: (a).Rapid increase in processing gain Explanation:Matched filter detection achieves high processing gain rapidly due to coherency. However when accurate information is not available about the signal transmitted by the primary user, then the matched filter detection method exhibits poor performance.
Q36.
Which among the following is not an operational unit in energy detection?

a.

Integrator

b.

Squaring unit

c.

Correlator

d.

Threshold device

Discuss
Answer: (c).Correlator Explanation:Energy detection consists of three operational units namely squaring device, integrator, and threshold device. The received signal energy is measured by squaring and integrating the received signal over an interval T. The output of the integrator is then evaluated by the threshold device to determine the existence of the primary user in the licensed spectrum.
Q37.
Which among the following are factors of significance in the energy detection technique?

a.

Probability of detection and probability of exception

b.

Probability of detection and probability of false alarm

c.

Probability of detection and probability of useful information

d.

Probability of false alarm and probability of useful information

Discuss
Answer: (b).Probability of detection and probability of false alarm Explanation:Probability of detection and probability of false alarm are factors of significance in energy detection technique. They depend on the signal to noise ratio, time-bandwidth product, complete and incomplete gamma functions, and generalized Marcum Q-function.
Q38.
Sensing control is implemented in the physical layer of the OSI model.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False Explanation:Sensing control is essential to adapt sensing operation in accordance with the dynamic radio environment. It operates in the physical and data-link layer of the OSI model. It coordinates the sensing operations among xG users in a distributed manner. It helps to avoid false alarms in cooperative sensing.
Q39.
Which among the following is achieved by coupling a modulated signal with a sine wave carrier?

a.

Causality

b.

Periodicity

c.

Linearity

d.

Stability

Discuss
Answer: (b).Periodicity Explanation:Modulated signals are coupled with sine wave carriers, hopping sequences, or cyclic prefixes to attain periodicity. The signals are regarded as cyclostationary due to periodic mean and autocorrelation.
Q40.
Which among the following is not an advantage of using cyclostationary feature detection?

a.

Better performance than energy detection

b.

Does not require prior knowledge of the signal transmitted by the primary user

c.

Robust noise performance

d.

Rapid attainment of high processing gain

Discuss
Answer: (d).Rapid attainment of high processing gain Explanation:The primary advantage of using cyclostationary feature detection is its ability to differentiate noise signals from modulated signals. This is due to incorporated redundancy in modulated signals. However cyclostationary feature detection is computationally intensive and demands long observation time.
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