Wireless Communication Quiz
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Questions and Answers

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

  • GSM (correct)
  • IS-95 CDMA
  • 802.11a
  • Ultra-wideband channels

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

  • GSM
  • Ultra-wideband channels
  • 802.11a
  • IS-95 CDMA (correct)

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

  • GSM
  • 802.11a (correct)
  • Ultra-wideband channels
  • IS-95 CDMA

    • 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

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