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 3 of 33

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Q21.
Which among the following is a requirement of a cognitive mesh network?

a.

Large spectrum

b.

Quality of service

c.

Security

d.

Effective modulation scheme

Discuss
Answer: (a).Large spectrum Explanation:Cognitive mesh networks require high capacity to support applications that require high throughput. xG networks are capable of accessing large portions of the spectrum and can support the demand generally present in dense urban areas. Cognitive mesh networks are used for providing broadband connectivity.
Q22.
Which among the following is not true about Mobile Virtual Network Operator?

a.

MVNO owns wireless infrastructure

b.

MVNO purchases infrastructure at retail price

c.

MVNO is a form of leased network

d.

MVNO might operate with mobile virtual network enabler

Discuss
Answer: (d).MVNO might operate with mobile virtual network enabler Explanation:Mobile Virtual Network Operator does not own wireless network infrastructure. It purchases network services from a mobile network operator. In this method, the primary network provides opportunistic access to licensed spectrum. This is an example of leased network implementation in xG architecture.
Q23.
xG networks allow usage of spectrum band without a fixed infrastructure.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True Explanation:xG networks allow usage of spectrum band without a fixed infrastructure by maintaining communication priority and response time. It is also capable of adding a temporary or permanent spectrum to infrastructure links that are used for relaying traffic.
Q24.
Which among the following is the function of out-of-band sensing?

a.

Detect primary base-station

b.

Detect spectrum holes

c.

Detect primary user

d.

Detect xG users

Discuss
Answer: (b).Detect spectrum holes Explanation:A cognitive radio should be aware of its surrounding radio environment. Spectrum sensing allows a radio to find the unused spectrum in the radio environment. In out-of-band sensing, cognitive radio users focus on the identification of spectrum holes over a wide frequency range to transmit their information.
Q25.
What is the purpose of in-band sensing?

a.

Interference avoidance

b.

Sharing spectrum information

c.

Sharing spectrum resources

d.

Spectrum handoff

Discuss
Answer: (a).Interference avoidance Explanation:Spectrum sensing identifies unused spectrum holes that are available for transmission for cognitive radio users. During transmission, the cognitive radio users continue to monitor the spectrum band. They also sense other users of the primary network in order to avoid interference. Spectrum sensing carried out during transmission is called in-band sensing.
Q26.
Why is cooperation required in spectrum sensing?

a.

Elimination of base-station

b.

Elimination of xG users

c.

Interference avoidance

d.

Improvement of sensing accuracy

Discuss
Answer: (d).Improvement of sensing accuracy Explanation:The cognitive radio user monitors and studies the local radio environment to identify the current spectrum availability. The information gathered by each user is shared between its neighbours. This practice is known as cooperation in sensing and it improves the sensing accuracy.
Q27.
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.
Q28.
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.
Q29.
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.
Q30.
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.
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