Recent

  • Show all results for ""
Wireless Communication Quiz

Wireless Communication Quiz

Created by
@AffirmativeJasper2611
Study Flashcards Play Quiz
Study Flashcards Play Quiz

Questions and Answers

Which of the following frequency diversity approaches uses time-domain equalization?

GSM

Which of the following frequency diversity approaches uses direct-sequence spread spectrum?

IS-95 CDMA

Which of the following frequency diversity approaches uses orthogonal frequency-division multiplexing (OFDM)?

802.11a

Which of the following is a potential impact of tap gain measurement errors in fast varying channels?

<p>Reduced diversity combining performance</p> Signup and view all the answers

Which channel type is particularly affected by tap gain measurement errors?

<p>Frequency-selective AWGN channel</p> Signup and view all the answers

Which concept provides a fundamental characterization of coded performance in wireless communication?

<p>Information theory</p> Signup and view all the answers

Which channel type has a capacity close to that of the AWGN channel when only receiver CSI is available?

<p>Fast fading channel</p> Signup and view all the answers

Which channel type can have a capacity greater than that of the AWGN channel when full CSI is available?

<p>Fast fading channel</p> Signup and view all the answers

Which type of communication channels provide more opportunities for performance boost with fading?

<p>Fast fading channels</p> Signup and view all the answers

In multiuser situations, which concept becomes even more powerful for opportunistic communication?

<p>Information theory</p> Signup and view all the answers

Which of the following is true about wireless channels?

<p>Wireless channels can be modeled as linear time-invariant systems</p> Signup and view all the answers

What is the frequency range for communication in the passband?

<p>$f_c-W/2$ to $f_c+W/2$</p> Signup and view all the answers

What is the baseband equivalent channel model for wireless communication?

<p>$y(t) = \sum_{l}h_lx(t-\tau_l)$</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>$1/W$</p> Signup and view all the answers

What causes fading in wireless channels?

<p>Destructive interference of multipaths</p> Signup and view all the answers

What is the Doppler spread in the two-path example given in the text?

<p>100 Hz</p> Signup and view all the answers

Which statistical model is commonly used for wireless channels?

<p>Rayleigh flat fading model</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Increased reliability</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>40 ms</p> Signup and view all the answers

What is the Alamouti scheme used for in wireless communication?

<p>Space-time code design</p> Signup and view all the answers

Which of the following is NOT a topic covered in the course?

<p>Opportunistic Communication</p> Signup and view all the answers

What is the main goal of the course?

<p>To explore new research developments in wireless communication</p> Signup and view all the answers

Which wireless systems are used as examples in the course?

<p>All of the above</p> Signup and view all the answers

What is the difference between large-scale fading and small-scale fading?

<p>Large-scale fading occurs due to reflections and obstructions, while small-scale fading occurs due to constructive and destructive interference.</p> Signup and view all the answers

What is multipath fading?

<p>Fading of the wireless channel due to constructive and destructive interference of the transmitted waves.</p> Signup and view all the answers

Which topic is covered on Day 2 of the course?

<p>Capacity and Multiplexing Architectures</p> Signup and view all the answers

What is the purpose of opportunistic communication?

<p>To explore the concept of multiuser diversity.</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>To improve capacity and multiplexing in the network.</p> Signup and view all the answers

Which topic is covered on Day 3 of the course?

<p>Multiple Access and Interference Management</p> Signup and view all the answers

What are the two spatial scales at which the wireless channel varies?

<p>Large-scale fading and small-scale fading</p> Signup and view all the answers

Which physical parameters impact how a wireless channel behaves from a communication system point of view?

<p>Carrier frequency, mobile speed, bandwidth, and delay spread</p> Signup and view all the answers

What is the frequency range for communication in the baseband?

<p>[-W/2, W/2]</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>1/W</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>40 ms</p> Signup and view all the answers

What is the Doppler spread in the two-path example given in the text?

<p>100 Hz</p> Signup and view all the answers

Which type of communication channels provide more opportunities for performance boost with fading?

<p>Wireless channels</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Increased reliability</p> Signup and view all the answers

What is the purpose of opportunistic communication?

<p>To maximize performance in wireless channels</p> Signup and view all the answers

Which statistical model is commonly used for wireless channels?

<p>Rayleigh flat fading model</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>To increase channel capacity</p> Signup and view all the answers

Which frequency diversity approach uses orthogonal frequency-division multiplexing (OFDM)?

<p>OFDM (eg. 802.11a )</p> Signup and view all the answers

Which channel type has a capacity close to that of the AWGN channel when only receiver CSI is available?

<p>Fast Fading Channel</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Improved reliability</p> Signup and view all the answers

What is the difference between large-scale fading and small-scale fading?

<p>Large-scale fading refers to variations in signal strength over long distances, while small-scale fading refers to variations in signal strength over short distances.</p> Signup and view all the answers

What is the main goal of the course?

<p>To provide an overview of wireless communication technologies</p> Signup and view all the answers

What causes fading in wireless channels?

<p>Multipath propagation</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>To increase the data rate of wireless communication</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>The channel delay spread</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>1 millisecond</p> Signup and view all the answers

What is the frequency range for communication in the passband?

<p>20 kHz to 20 MHz</p> Signup and view all the answers

Which of the following is NOT a characteristic of large-scale fading in wireless channels?

<p>Power attenuation decreases with distance.</p> Signup and view all the answers

What is the main purpose of opportunistic communication in wireless networks?

<p>To maximize the capacity of the wireless channel.</p> Signup and view all the answers

Which of the following frequency diversity approaches uses time-domain equalization?

<p>Orthogonal frequency-division multiplexing (OFDM)</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Improved resistance to fading and interference.</p> Signup and view all the answers

Which topic is covered on Day 3 of the course?

<p>Multiple Access and Interference Management</p> Signup and view all the answers

In multiuser situations, which concept becomes even more powerful for opportunistic communication?

<p>Multiuser diversity</p> Signup and view all the answers

Which channel type can have a capacity greater than that of the AWGN channel when full Channel State Information (CSI) is available?

<p>Wireless multipath channel</p> Signup and view all the answers

Which type of communication channels provide more opportunities for performance boost with fading?

<p>Small-scale fading channels</p> Signup and view all the answers

Which of the following is true about wireless channels?

<p>They can vary at both large and small spatial scales.</p> Signup and view all the answers

What are the two spatial scales at which the wireless channel varies?

<p>Large-scale fading and small-scale fading</p> Signup and view all the answers

Which frequency diversity approach uses time-domain equalization?

<p>GSM</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Improved coverage</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>1 ms</p> Signup and view all the answers

Which channel type has a capacity close to that of the AWGN channel when only receiver CSI is available?

<p>Rayleigh channel</p> Signup and view all the answers

What is the purpose of opportunistic communication?

<p>To exploit favorable channel conditions</p> Signup and view all the answers

What is the main goal of the course?

<p>To analyze wireless channel capacity</p> Signup and view all the answers

Which type of communication channels provide more opportunities for performance boost with fading?

<p>Fast fading channels</p> Signup and view all the answers

Which statistical model is commonly used for wireless channels?

<p>Rayleigh distribution</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>1 ms</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>To improve data rate</p> Signup and view all the answers

Which of the following is true about wireless channels?

<p>Wireless channels can be modeled as linear time-varying systems</p> Signup and view all the answers

What is the frequency range for communication in the passband?

<p>f_c-W/2 to f_c+W/2</p> Signup and view all the answers

What is the frequency range for communication in the baseband?

<p>-W/2 to W/2</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>1/W</p> Signup and view all the answers

What is the Doppler spread in the two-path example given in the text?

<p>100 Hz</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Increased reliability</p> Signup and view all the answers

Which concept provides a fundamental characterization of coded performance in wireless communication?

<p>Diversity</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>40 ms</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>To increase capacity and improve reliability</p> Signup and view all the answers

Which type of communication channels provide more opportunities for performance boost with fading?

<p>Frequency-selective fading channels</p> Signup and view all the answers

Which of the following is true about small-scale fading in wireless channels?

<p>It is due to constructive and destructive interference of transmitted waves</p> Signup and view all the answers

What is the purpose of the diversity-multiplexing tradeoff?

<p>To find the optimal balance between diversity and multiplexing gains</p> Signup and view all the answers

Which topic is covered on Day 1 of the course?

<p>Capacity of Wireless Channels</p> Signup and view all the answers

What is the main advantage of using MIMO in wireless networks?

<p>Higher data rates</p> Signup and view all the answers

Which channel type has a capacity close to that of the AWGN channel when full CSI is available?

<p>Rician fading channel</p> Signup and view all the answers

What is the difference between large-scale fading and small-scale fading in wireless channels?

<p>Large-scale fading is caused by multipath propagation, while small-scale fading is caused by variations in the received signal strength</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>40 ms</p> Signup and view all the answers

What are the two spatial scales at which the wireless channel varies?

<p>Large-scale fading and small-scale fading</p> Signup and view all the answers

Which wireless systems are used as examples in the course?

<p>All of the above</p> Signup and view all the answers

What is the role of opportunistic communication in wireless networks?

<p>To exploit multiuser diversity</p> Signup and view all the answers

Which frequency diversity approach uses time-domain equalization?

<p>GSM</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>2 symbols</p> Signup and view all the answers

Which frequency diversity approach uses direct-sequence spread spectrum?

<p>IS-95 CDMA</p> Signup and view all the answers

Which frequency diversity approach uses orthogonal frequency-division multiplexing (OFDM)?

<p>802.11a</p> Signup and view all the answers

Which channel type has a capacity close to that of the AWGN channel when only receiver Channel State Information (CSI) is available?

<p>Fast fading channel</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Improved reliability</p> Signup and view all the answers

Which concept provides a fundamental characterization of coded performance in wireless communication?

<p>Information theory</p> Signup and view all the answers

What is the main goal of the course?

<p>To learn about wireless communication techniques</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>4 symbols</p> Signup and view all the answers

Which of the following is true about small-scale fading in wireless channels?

<p>It is characterized by Rayleigh distribution</p> Signup and view all the answers

Which of the following is a characteristic of small-scale fading in wireless channels?

<p>Caused by constructive and destructive interference of transmitted waves</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>10 ms</p> Signup and view all the answers

Which frequency diversity approach uses orthogonal frequency-division multiplexing (OFDM)?

<p>Flarion's Flash OFDM</p> Signup and view all the answers

What is the Doppler spread in the two-path example given in the text?

<p>10 Hz</p> Signup and view all the answers

Which channel type has a capacity close to that of the AWGN channel when only receiver CSI is available?

<p>Large-scale fading channel</p> Signup and view all the answers

Which statistical model is commonly used for wireless channels?

<p>Rayleigh fading</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>To increase the capacity of wireless channels</p> Signup and view all the answers

What is the baseband equivalent channel model for wireless communication?

<p>Baseband equivalent channel</p> Signup and view all the answers

Which type of communication channels provide more opportunities for performance boost with fading?

<p>Small-scale fading channels</p> Signup and view all the answers

What is the purpose of opportunistic communication in wireless networks?

<p>To increase the capacity of wireless channels</p> Signup and view all the answers

Which of the following is true about wireless channels?

<p>Wireless channels can be modeled as linear time-varying systems</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>40 ms</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Increased reliability</p> Signup and view all the answers

Which statistical model is commonly used for wireless channels?

<p>Rayleigh flat fading model</p> Signup and view all the answers

Which channel type can have a capacity greater than that of the AWGN channel when full CSI is available?

<p>Rician fading channel</p> Signup and view all the answers

Which frequency diversity approach uses orthogonal frequency-division multiplexing (OFDM)?

<p>Time diversity</p> Signup and view all the answers

Which of the following frequency diversity approaches uses direct-sequence spread spectrum?

<p>Space-time codes</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>10 ms</p> Signup and view all the answers

What is the difference between large-scale fading and small-scale fading?

<p>Large-scale fading refers to fading caused by shadowing, while small-scale fading refers to fading caused by multipath propagation</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>To increase the data rate of a wireless network</p> Signup and view all the answers

Which channel type has a capacity close to that of the AWGN channel when full CSI is available?

<p>Frequency-selective AWGN channel</p> Signup and view all the answers

What is the baseband equivalent channel model for wireless communication?

<p>Frequency-selective AWGN channel</p> Signup and view all the answers

Which channel type has a capacity close to that of the AWGN channel when only receiver CSI is available?

<p>Slow fading channel</p> Signup and view all the answers

What is the frequency range for communication in the passband?

<p>Wideband</p> Signup and view all the answers

What is the Doppler spread in the two-path example given in the text?

<p>10 Hz</p> Signup and view all the answers

What is the role of opportunistic communication in wireless networks?

<p>To improve channel capacity</p> Signup and view all the answers

What is the main advantage of using MIMO in wireless networks?

<p>Improved channel capacity</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>1 millisecond</p> Signup and view all the answers

Which of the following frequency diversity approaches uses time-domain equalization?

<p>GSM</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>1 symbol duration</p> Signup and view all the answers

Which of the following is true about wireless channels?

<p>Wireless channels can be modeled as linear time-varying systems.</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>1/W</p> Signup and view all the answers

Which of the following is NOT a topic covered in the course?

<p>Rayleigh flat fading model</p> Signup and view all the answers

What is the frequency range for communication in the passband?

<p>[f_c-W/2, f_c+ W/2]</p> Signup and view all the answers

What is the main goal of the course?

<p>To understand how physical parameters impact wireless channel behavior.</p> Signup and view all the answers

What is the Doppler spread in the two-path example given in the text?

<p>100 Hz</p> Signup and view all the answers

Which wireless systems are used as examples in the course?

<p>GSM</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Increased reliability</p> Signup and view all the answers

What is the baseband equivalent channel model for wireless communication?

<p>Sampled baseband-equivalent channel model</p> Signup and view all the answers

What is multipath fading?

<p>Destructive interference of multipaths causing signal degradation.</p> Signup and view all the answers

Which of the following is true about large-scale fading in wireless channels?

<p>Large-scale fading has time constants associated with variations that are very long.</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Improved signal quality</p> Signup and view all the answers

Which of the following is NOT a characteristic of small-scale fading in wireless channels?

<p>Occurs at very high carrier frequencies</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>Increase the capacity of wireless channels</p> Signup and view all the answers

Which type of communication channels provide more opportunities for performance boost with fading?

<p>Frequency-selective fading channels</p> Signup and view all the answers

What is the purpose of the diversity-multiplexing tradeoff?

<p>To find the optimal tradeoff between diversity and multiplexing gains</p> Signup and view all the answers

Which statistical model is commonly used for wireless channels?

<p>Rayleigh distribution</p> Signup and view all the answers

Which frequency diversity approach uses direct-sequence spread spectrum?

<p>Code division multiple access (CDMA)</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>80 ms</p> Signup and view all the answers

Which topic is covered on Day 2 of the course?

<p>MIMO</p> Signup and view all the answers

Which frequency diversity approach uses time-domain equalization?

<p>GSM</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>2 symbols</p> Signup and view all the answers

Which channel type can have a capacity greater than that of the AWGN channel when full Channel State Information (CSI) is available?

<p>Fast fading channel</p> Signup and view all the answers

What is the baseband equivalent channel model for wireless communication?

<p>MLSD</p> Signup and view all the answers

Which type of communication channels provide more opportunities for performance boost with fading?

<p>Fast fading channels</p> Signup and view all the answers

Which topic is covered on Day 2 of the course?

<p>Frequency Diversity Approaches</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Increased capacity</p> Signup and view all the answers

Which physical parameters impact how a wireless channel behaves from a communication system point of view?

<p>All of the above</p> Signup and view all the answers

Which wireless systems are used as examples in the course?

<p>802.11a and OFDM</p> Signup and view all the answers

What causes fading in wireless channels?

<p>All of the above</p> Signup and view all the answers

Which of the following is NOT a topic covered in the course?

<p>Diversity-Multiplexing Tradeoff</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>Minutes</p> Signup and view all the answers

What is the main advantage of using MIMO in wireless networks?

<p>Increased capacity</p> Signup and view all the answers

Which frequency diversity approach uses orthogonal frequency-division multiplexing (OFDM)?

<p>Time-domain equalization</p> Signup and view all the answers

What is the frequency range for communication in the baseband?

<p>Low frequencies</p> Signup and view all the answers

Which wireless systems are used as examples in the course?

<p>CDMA 2000 1x EV-DO and Flarion's Flash OFDM</p> Signup and view all the answers

Which of the following is true about wireless channels?

<p>They vary at both large and small spatial scales</p> Signup and view all the answers

In multiuser situations, which concept becomes even more powerful for opportunistic communication?

<p>Diversity</p> Signup and view all the answers

What is the role of opportunistic communication in wireless networks?

<p>To increase capacity</p> Signup and view all the answers

Which concept provides a fundamental characterization of coded performance in wireless communication?

<p>Diversity</p> Signup and view all the answers

Which of the following is a characteristic of small-scale fading in wireless channels?

<p>Small-scale fading is caused by variations in the delay spread.</p> Signup and view all the answers

What is the impact of tap gain measurement errors in fast varying channels?

<p>Tap gain measurement errors can cause the system to resolve multipaths with delays less than 1/W.</p> Signup and view all the answers

Which of the following is NOT a potential impact of tap gain measurement errors in fast varying channels?

<p>Increased interference between multipaths.</p> Signup and view all the answers

What is the frequency range for communication in the passband?

<p>[f_c-W/2, f_c+W/2]</p> Signup and view all the answers

Which of the following is a characteristic of Rayleigh flat fading model?

<p>Rayleigh flat fading model assumes many small scattered paths.</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>1/W</p> Signup and view all the answers

What is the main advantage of using diversity in wireless communication?

<p>Improved reliability.</p> Signup and view all the answers

What is the main goal of the course?

<p>To design and evaluate wireless communication systems.</p> Signup and view all the answers

What is the maximum delay constraint in GSM for achieving full diversity?

<p>40 ms</p> Signup and view all the answers

What is the maximum delay resolved by the system in the baseband equivalent channel model?

<p>1/W</p> Signup and view all the answers

Study Notes

Frequency Diversity Approaches

  • Time-domain equalization is used in one of the frequency diversity approaches
  • Direct-sequence spread spectrum is used in one of the frequency diversity approaches
  • Orthogonal frequency-division multiplexing (OFDM) is used in one of the frequency diversity approaches

Channel Types

  • AWGN (Additive White Gaussian Noise) channel has a capacity close to that of another channel type when only receiver CSI is available
  • Another channel type can have a capacity greater than that of the AWGN channel when full CSI is available

Channel Characteristics

  • Fading in wireless channels is caused by multipath and Doppler spread
  • Large-scale fading and small-scale fading are two types of fading in wireless channels
  • Multipath fading is a type of fading in wireless channels
  • The Doppler spread in the two-path example is a specific value

Communication Systems

  • The main goal of the course is to understand wireless communication systems
  • GSM (Global System for Mobile Communications) is a wireless system used as an example in the course
  • MIMO (Multiple-Input Multiple-Output) is used in wireless networks to increase capacity
  • Opportunistic communication is used in wireless networks to take advantage of channel variations
  • Diversity is used in wireless communication to improve performance
  • The Alamouti scheme is used in wireless communication for a specific purpose

Channel Modeling

  • The baseband equivalent channel model is used to model wireless channels
  • The maximum delay resolved by the system in the baseband equivalent channel model is a specific value
  • The frequency range for communication in the passband is a specific range
  • The frequency range for communication in the baseband is a specific range

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Get started for free
Quiz Team

More Quizzes Like This

Wireless Communication Networks Quiz
72 questions

Wireless Communication Networks Quiz

LeadingOnyx avatar
LeadingOnyx
Wireless Communication and Home Screen Quiz
5 questions

Wireless Communication and Home Screen Quiz

AgileNovaculite8702 avatar
AgileNovaculite8702
Wireless Communication Technology Quiz
5 questions

Wireless Communication Technology Quiz

MagnanimousJubilation avatar
MagnanimousJubilation
Wireless Communication Diversity Techniques
18 questions

Wireless Communication Diversity Techniques

AwestruckGiant avatar
AwestruckGiant
Use Quizgecko on...
Browser
Open
Browser
Browser