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 (D)</p> Signup and view all the answers

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

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

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

<p>Information theory (C)</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 (B)</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 (D)</p> Signup and view all the answers

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

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

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

<p>Information theory (A)</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 (D)</p> Signup and view all the answers

What is the frequency range for communication in the passband?

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

What is the baseband equivalent channel model for wireless communication?

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

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

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

What causes fading in wireless channels?

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

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

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

Which statistical model is commonly used for wireless channels?

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

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

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

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

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

What is the Alamouti scheme used for in wireless communication?

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

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

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

What is the main goal of the course?

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

Which wireless systems are used as examples in the course?

<p>All of the above (D)</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. (B)</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. (C)</p> Signup and view all the answers

Which topic is covered on Day 2 of the course?

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

What is the purpose of opportunistic communication?

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

Which topic is covered on Day 3 of the course?

<p>Multiple Access and Interference Management (D)</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 (A)</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 (C)</p> Signup and view all the answers

What is the frequency range for communication in the baseband?

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

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

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

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

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

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

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

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

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

What is the purpose of opportunistic communication?

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

Which statistical model is commonly used for wireless channels?

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

What is the role of MIMO in wireless networks?

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

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

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

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

<p>Improved reliability (B)</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. (A)</p> Signup and view all the answers

What is the main goal of the course?

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

What causes fading in wireless channels?

<p>Multipath propagation (D)</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 (C)</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 (D)</p> Signup and view all the answers

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

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

What is the frequency range for communication in the passband?

<p>20 kHz to 20 MHz (C)</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. (D)</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. (C)</p> Signup and view all the answers

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

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

Which topic is covered on Day 3 of the course?

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

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

<p>Multiuser diversity (B)</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 (D)</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 (C)</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. (B)</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 (C)</p> Signup and view all the answers

Which frequency diversity approach uses time-domain equalization?

<p>GSM (D)</p> Signup and view all the answers

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

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

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

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

What is the purpose of opportunistic communication?

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

What is the main goal of the course?

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

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

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

Which statistical model is commonly used for wireless channels?

<p>Rayleigh distribution (C)</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 (B)</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

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

What is the frequency range for communication in the baseband?

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

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

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

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

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

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

<p>Diversity (D)</p> Signup and view all the answers

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

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

What is the role of MIMO in wireless networks?

<p>To increase capacity and improve reliability (A)</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 (A)</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 (B)</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 (D)</p> Signup and view all the answers

Which topic is covered on Day 1 of the course?

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

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

<p>Higher data rates (A)</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 (B)</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 (B)</p> Signup and view all the answers

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

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

Which wireless systems are used as examples in the course?

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

What is the role of opportunistic communication in wireless networks?

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

Which frequency diversity approach uses time-domain equalization?

<p>GSM (D)</p> Signup and view all the answers

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

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

Which frequency diversity approach uses direct-sequence spread spectrum?

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

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

<p>802.11a (D)</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 (B)</p> Signup and view all the answers

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

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

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

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

What is the main goal of the course?

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

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

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

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

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

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

<p>10 Hz (A)</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 (C)</p> Signup and view all the answers

Which statistical model is commonly used for wireless channels?

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

What is the role of MIMO in wireless networks?

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

What is the baseband equivalent channel model for wireless communication?

<p>Baseband equivalent channel (C)</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 (B)</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 (C)</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 (B)</p> Signup and view all the answers

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

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

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

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

Which statistical model is commonly used for wireless channels?

<p>Rayleigh flat fading model (A)</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 (B)</p> Signup and view all the answers

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

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

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

<p>Space-time codes (B)</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 (D)</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 (C)</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 (A)</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 (C)</p> Signup and view all the answers

What is the baseband equivalent channel model for wireless communication?

<p>Frequency-selective AWGN channel (C)</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 (D)</p> Signup and view all the answers

What is the frequency range for communication in the passband?

<p>Wideband (B)</p> Signup and view all the answers

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

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

What is the role of opportunistic communication in wireless networks?

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

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

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

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

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

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

<p>GSM (D)</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 (A)</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. (B)</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 (A)</p> Signup and view all the answers

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

<p>Rayleigh flat fading model (D)</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] (B)</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. (D)</p> Signup and view all the answers

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

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

Which wireless systems are used as examples in the course?

<p>GSM (C)</p> Signup and view all the answers

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

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

What is the baseband equivalent channel model for wireless communication?

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

What is multipath fading?

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

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

<p>Improved signal quality (C)</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 (D)</p> Signup and view all the answers

What is the role of MIMO in wireless networks?

<p>Increase the capacity of wireless channels (B)</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 (A)</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 (A)</p> Signup and view all the answers

Which statistical model is commonly used for wireless channels?

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

Which frequency diversity approach uses direct-sequence spread spectrum?

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

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

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

Which topic is covered on Day 2 of the course?

<p>MIMO (A)</p> Signup and view all the answers

Which frequency diversity approach uses time-domain equalization?

<p>GSM (B)</p> Signup and view all the answers

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

<p>2 symbols (D)</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 (B)</p> Signup and view all the answers

What is the baseband equivalent channel model for wireless communication?

<p>MLSD (B)</p> Signup and view all the answers

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

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

Which topic is covered on Day 2 of the course?

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

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

<p>Increased capacity (C)</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 (D)</p> Signup and view all the answers

Which wireless systems are used as examples in the course?

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

What causes fading in wireless channels?

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

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

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

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

<p>Minutes (A)</p> Signup and view all the answers

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

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

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

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

What is the frequency range for communication in the baseband?

<p>Low frequencies (C)</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 (C)</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 (B)</p> Signup and view all the answers

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

<p>Diversity (A)</p> Signup and view all the answers

What is the role of opportunistic communication in wireless networks?

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

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

<p>Diversity (A)</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. (D)</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. (C)</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. (A)</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] (C)</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. (B)</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 (B)</p> Signup and view all the answers

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

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

What is the main goal of the course?

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

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

<p>40 ms (C)</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 (B)</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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