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 7 of 33

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Q61.
Which among the following is the expression for channel capacity as per Shannon-Hartley theorem?
B is bandwidth, N is the average noise power, and S is the average received signal power.

a.

C=B+logโ‚‚(1+ \(\frac{N}{S})\)

b.

C=B+logโ‚‚(1+ \(\frac{S}{N})\)

c.

C=B logโ‚‚(1+ \(\frac{N}{S})\)

d.

C=B logโ‚‚(1+ \(\frac{S}{N})\)

Discuss
Answer: (d).C=B logโ‚‚(1+ \(\frac{S}{N})\) Explanation:Shannon Hartley theorem states the maximum rate of transmission over a channel of specified bandwidth containing noise. The calculated channel capacity creates an upper bound for maximum error-free information transmission.
C=B logโ‚‚(1+ \(\frac{S}{N})\)
Here B is bandwidth, N is the average noise power, and S is the average received signal power.
Q62.
Which among the following an expression for spectrum capacity in OFDM based xG networks?
ฮฑ refers to a set of unused spectrum units, G(f) is the channel power gain at frequency f, Sโ‚€ is the signal power per unit frequency and Nโ‚€ is the noise power per unit frequency.

a.

C=โˆซฮฑ\(\frac{1}{2}\)logโ‚‚(1+\(\frac{G(f)S_0}{N_0})\)

b.

C=โˆซฮฑ\(\frac{1}{2}\)logโ‚‚(1+\(\frac{S_0}{N_0})\)

c.

C=โˆซฮฑB logโ‚‚(1+\(\frac{G(f)S_0}{N_0})\)

d.

C=โˆซฮฑB logโ‚‚(1+\(\frac{G(f)N_0}{S_0})\)

Discuss
Answer: (a).C=โˆซฮฑ\(\frac{1}{2}\)logโ‚‚(1+\(\frac{G(f)S_0}{N_0})\) Explanation:Orthogonal Frequency Division Multiplexing is a digital modulation scheme. The data stream is divided into several closely spaced subcarrier signals at different frequencies. The spectrum capacity of OFDM xG networks is given by the expression,
C=โˆซฮฑ\(\frac{1}{2}\)logโ‚‚(1+\(\frac{G(f)S_0}{N_0})\)
Here ฮฑ refers to a set of unused spectrum units, G(f) is the channel power gain at frequency f, Sโ‚€ is the signal power per unit frequency, and Nโ‚€ is the noise power per unit frequency.
Q63.
Which among the following is not selected in accordance with the user requirement?

a.

Interference

b.

Data rate

c.

Tolerable error rate

d.

Transmission mode

Discuss
Answer: (a).Interference Explanation:Following the characterization of the spectrum, the spectrum band for transmission is selected by weighing the spectrum characteristics and the quality of service requirements. Spectrum manager fixes the data rate, tolerable error rate, transmission mode, the bandwidth of transmission, and the delay bound according to the user requirements.
Q64.
Which among the following is not a challenge for spectrum management?

a.

Interference avoidance

b.

Quality of service awareness

c.

Seamless communication

d.

Interference temperature measurement

Discuss
Answer: (d).Interference temperature measurement Explanation:xG users should not cause interference to primary user communication. The handoff to a different spectrum band upon arrival of the primary user should be seamless. The dynamic spectrum environment and quality of service requirements should be analyzed and managed for effective communication.
Q65.
Which among the following is a challenge for spectrum decision models?

a.

Combining multiple characterization parameters

b.

Supporting OFDM networks

c.

Supporting multiple spectrum bands

d.

Maintaining a decision model for each characterization parameter

Discuss
Answer: (a).Combining multiple characterization parameters Explanation:Spectrum decision models can be built for various characterization parameters such as signal to noise, date rate, error rate, and other parameters that affect the quality of service. However a decision model combining several spectrum parameters is not available. Spectrum decision models support OFDM networks that have multiple spectrum bands operating simultaneously for transmission.
Q66.
Which among the following is not a requirement for multiple spectrum band transmission by xG user?

a.

Spectrum holes

b.

Compatibility with internal policies

c.

Contiguous spectrum band

d.

Compatibility with quality of service

Discuss
Answer: (c).Contiguous spectrum band Explanation:xG users can transmit packets on multiple spectrum bands provided the available spectrum meets the quality of service requirements and the spectrum policies required for communication. However it does not require the multiple spectrum bands to be contiguous. This exhibits a vast improvement in communication quality during the spectrum handoff.
Q67.
Which among the following is not an advantage of avoiding contiguous spectrum bands for transmission?

a.

Low delay

b.

Low power consumption

c.

Low interference

d.

Mitigation of quality of service degradation

Discuss
Answer: (d).Mitigation of quality of service degradation Explanation:The primary advantage of using a contiguous spectrum band is the mitigation of the quality of service degradation. This is because when a user has to vacate a spectrum band on the arrival of the primary user, the other bands continue to transmit maintaining communication. Low power is consumed in each band and less interference with the primary user is achieved.
Q68.
Which among the following replaces the static sine pulses of OFDM to improve flexibility?

a.

Wavelet bases

b.

Triangular pulses

c.

Impulse bases

d.

Ramp pulses

Discuss
Answer: (a).Wavelet bases Explanation:In multi-carrier wavelet packet modulation, wavelet bases replace the static sine/cosine pulses of OFDM. This technique provides higher sideband suppression. It also reduces inter-channel interference and inter-symbol interference.
Q69.
Which among the following is not a disadvantage of using OFDM?

a.

Complex computation is necessary

b.

Sensitive to frequency offset

c.

High peak to average power ratio

d.

Low data rate

Discuss
Answer: (a).Complex computation is necessary Explanation:OFDM requires only the computation of fast Fourier transform and inverse fast Fourier transform of the signal to be transmitted. However it requires the subcarriers to remain orthogonal and exhibits a large peak to average power ratio due to the presence of complex sinusoids in time domain OFDM signals.
Q70.
What is the full form of CE-OFDM?

a.

Closed Envelope Orthogonal Frequency Division Multiplexing

b.

Constant Envelope Orthogonal Frequency Division Multiplexing

c.

Constant Evolute Orthogonal Frequency Division Multiplexing

d.

Closed Evolute Orthogonal Frequency Division Multiplexing

Discuss
Answer: (b).Constant Envelope Orthogonal Frequency Division Multiplexing Explanation:In Constant Envelope Orthogonal Frequency Division Multiplexing, the complex modulated signals are positioned in a complex conjugated arrangement to obtain a real value inverse fast Fourier transform output. Also, phase modulation is applied in the real value time domain. This technique reduces the high peak to average power ratio of OFDM.
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