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Questions and Answers
Frequency diversity approaches include time-domain equalization, direct-sequence spread spectrum, and orthogonal frequency-division multiplexing (OFDM).
True
Maximum likelihood sequence detection achieves full diversity in the presence of channel uncertainty.
False
In fast varying channels, tap gain measurement errors have a significant impact on diversity combining performance.
True
Information theory provides a fundamental characterization of coded performance and suggests new ways to communicate over the wireless channel.
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The capacity of an AWGN channel is limited by power and bandwidth.
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Waterfilling in the frequency domain is used in frequency-selective AWGN channels.
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A slow fading channel has a higher capacity than a fast fading channel.
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Transmit diversity is more effective than receive diversity in a fast fading channel.
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Repetition is a form of time diversity.
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A fast fading channel with full channel state information (CSI) has a lower capacity than an AWGN channel.
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True or false: Wireless channels can be modeled as linear time-varying systems.
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True or false: Fading occurs when there is constructive interference of the multipaths that contribute to a tap.
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True or false: The Rician model includes only scattered paths.
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True or false: The Clarke's (or Jake's) model specifies the autocorrelation function and power spectral density of the fading process.
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True or false: Diversity can be provided across time, frequency, and space to increase reliability in communication over a flat fading channel.
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True or false: BPSK modulation uses only the I-phase, while QPSK delivers 2 bits per complex symbol.
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True or false: Time diversity can be obtained by interleaving and coding over symbols across different coherent time periods.
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True or false: Repetition coding fully exploits the degrees of freedom in the channel.
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True or false: Space-time codes transmit the same symbol simultaneously at the antennas.
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True or false: Cooperative diversity involves users exchanging information to increase diversity.
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The goal of the course is to study the fundamentals as well as the new research developments in wireless communication.
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The concepts in the course are illustrated using examples from several modern wireless systems.
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The course covers topics such as diversity, capacity of wireless channels, and MIMO.
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The course does not include any information about wireless networks.
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Large-scale fading refers to variations in the wireless channel due to reflections and obstructions.
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Small-scale fading in wireless communication is mainly caused by variations in carrier frequency.
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The time constants associated with large-scale fading are usually very short.
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Multipath fading in wireless communication is caused by constructive and destructive interference of the transmitted waves.
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The channel in wireless communication only varies when the mobile device moves a distance of the order of the carrier wavelength.
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The course covers topics such as opportunistic communication and multiuser diversity.
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True or false: Wireless communication typically happens at very low carrier frequency.
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True or false: Large-scale fading is more important for communication system design than for cell site planning.
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True or false: Small-scale fading in wireless communication is mainly caused by variations in the carrier wavelength.
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True or false: The time constants associated with large-scale fading are very short.
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True or false: Fading occurs when there is destructive interference of the multipaths that contribute to a tap.
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True or false: Wireless channels can be modeled as linear time-invariant systems.
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True or false: Repetition coding fully exploits the degrees of freedom in the wireless channel.
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True or false: Transmit diversity is more effective than receive diversity in a slow fading channel.
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True or false: The channel in wireless communication only varies when the mobile device moves a distance of the order of the carrier frequency.
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True or false: Maximum likelihood sequence detection achieves full diversity in the absence of channel uncertainty.
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True or false: Wireless channels can be modeled as linear time-varying systems?
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True or false: Time diversity can be obtained by interleaving and coding over symbols across different coherent time periods?
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True or false: Space-time codes transmit the same symbol simultaneously at the antennas?
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True or false: Cooperative diversity involves users exchanging information to increase diversity?
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True or false: Repetition is a form of time diversity?
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True or false: Diversity can be provided across time, frequency, and space to increase reliability in communication over a flat fading channel?
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True or false: The Rician model includes only scattered paths?
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True or false: Fading occurs when there is constructive interference of the multipaths that contribute to a tap?
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True or false: BPSK modulation uses only the I-phase, while QPSK delivers 2 bits per complex symbol?
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True or false: A fast fading channel with full channel state information (CSI) has a lower capacity than an AWGN channel?
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True or false: Maximum likelihood sequence detection achieves full diversity in the presence of channel uncertainty.
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True or false: A fast fading channel with full channel state information (CSI) has a lower capacity than an AWGN channel.
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True or false: Waterfilling in the frequency domain is used in frequency-selective AWGN channels.
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True or false: Cooperative diversity involves users exchanging information to increase diversity.
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True or false: Space-time codes transmit the same symbol simultaneously at the antennas.
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True or false: The capacity of an AWGN channel is limited by power and bandwidth.
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True or false: A slow fading channel has a higher capacity than a fast fading channel.
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True or false: The Clarke's (or Jake's) model specifies the autocorrelation function and power spectral density of the fading process.
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True or false: Wireless channels can be modeled as linear time-varying systems.
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True or false: The Rician model includes only scattered paths.
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True or false: Rayleigh flat fading model is based on many small scattered paths.
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True or false: Repetition coding fully exploits the degrees of freedom in the wireless channel.
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True or false: Time diversity can be obtained by interleaving and coding over symbols across different coherent time periods.
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True or false: Space-time codes transmit the same symbol simultaneously at the antennas.
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True or false: Cooperative diversity involves users exchanging information to increase diversity.
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True or false: Wireless channels can be modeled as linear time-varying systems.
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True or false: Fading occurs when there is constructive interference of the multipaths that contribute to a tap.
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True or false: The Clarke's (or Jake's) model specifies the autocorrelation function and power spectral density of the fading process.
Signup and view all the answers
True or false: BPSK modulation uses only the I-phase, while QPSK delivers 2 bits per complex symbol.
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True or false: Large-scale fading refers to variations in the wireless channel due to reflections and obstructions.
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True or false: Wireless communication typically happens at very high carrier frequency.
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True or false: The Clarke's (or Jake's) model specifies the autocorrelation function and power spectral density of the fading process.
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True or false: Fading occurs when there is constructive interference of the multipaths that contribute to a tap.
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True or false: The time constants associated with large-scale fading are very long as the mobile moves, many seconds or minutes.
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True or false: The course covers topics such as opportunistic communication and multiuser diversity.
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True or false: Space-time codes transmit the same symbol simultaneously at the antennas.
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True or false: The channel in wireless communication only varies when the mobile device moves a distance of the order of the carrier wavelength.
Signup and view all the answers
True or false: BPSK modulation uses only the I-phase, while QPSK delivers 2 bits per complex symbol.
Signup and view all the answers
True or false: The course covers topics such as diversity, capacity of wireless channels, and MIMO.
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True or false: Waterfilling in the frequency domain is used in frequency-selective AWGN channels.
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True or false: Frequency diversity approaches include time-domain equalization, direct-sequence spread spectrum, and orthogonal frequency-division multiplexing (OFDM).
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True or false: Maximum likelihood sequence detection achieves full diversity in the presence of channel uncertainty.
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True or false: Waterfilling in the frequency domain is used in frequency-selective AWGN channels.
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True or false: A fast fading channel with full channel state information (CSI) has a lower capacity than an AWGN channel.
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True or false: Small-scale fading in wireless communication is mainly caused by variations in the carrier wavelength.
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True or false: The capacity of an AWGN channel is limited by power and bandwidth.
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True or false: Diversity can be provided across time, frequency, and space to increase reliability in communication over a flat fading channel.
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True or false: Repetition coding fully exploits the degrees of freedom in the wireless channel.
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True or false: Cooperative diversity involves users exchanging information to increase diversity.
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True or false: In fast varying channels, tap gain measurement errors have a significant impact on diversity combining performance.
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True or false: Wireless communication typically happens at very low carrier frequency.
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True or false: Multipath fading in wireless communication is caused by constructive and destructive interference of the transmitted waves.
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True or false: Large-scale fading refers to variations in the wireless channel due to reflections and obstructions.
Signup and view all the answers
True or false: The capacity of an AWGN channel is limited by power and bandwidth.
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True or false: The Rician model includes only scattered paths.
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True or false: The time constants associated with large-scale fading are very long as the mobile moves, many seconds or minutes.
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True or false: Frequency diversity approaches include time-domain equalization, direct-sequence spread spectrum, and orthogonal frequency-division multiplexing (OFDM).
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True or false: Space-time codes transmit the same symbol simultaneously at the antennas.
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True or false: Time diversity can be obtained by interleaving and coding over symbols across different coherent time periods.
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True or false: The channel in wireless communication only varies when the mobile device moves a distance of the order of the carrier frequency.
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True or false: The Viterbi algorithm is used for maximum likelihood sequence detection.
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True or false: Full diversity can be achieved when performing maximum likelihood sequence detection using the Viterbi algorithm.
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True or false: In fast varying channels, tap gain measurement errors have a significant impact on diversity combining performance.
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True or false: Waterfilling in the frequency domain is used in frequency-selective AWGN channels.
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True or false: Information theory provides a fundamental characterization of coded performance.
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True or false: A fast fading channel with full channel state information (CSI) has a higher capacity than an AWGN channel.
Signup and view all the answers
True or false: Multipath fading in wireless communication is caused by constructive and destructive interference of the transmitted waves.
Signup and view all the answers
True or false: Space-time codes transmit the same symbol simultaneously at the antennas.
Signup and view all the answers
True or false: Time diversity can be obtained by interleaving and coding over symbols across different coherent time periods.
Signup and view all the answers
True or false: Large-scale fading refers to variations in the wireless channel due to reflections and obstructions.
Signup and view all the answers
True or false: Wireless channels can be modeled as linear time-invariant systems.
Signup and view all the answers
True or false: Frequency diversity approaches include time-domain equalization, direct-sequence spread spectrum, and orthogonal frequency-division multiplexing (OFDM).
Signup and view all the answers
True or false: Repetition coding fully exploits the degrees of freedom in the wireless channel.
Signup and view all the answers
True or false: Large-scale fading refers to variations in the wireless channel due to reflections and obstructions.
Signup and view all the answers
True or false: BPSK modulation uses only the I-phase, while QPSK delivers 2 bits per complex symbol.
Signup and view all the answers
True or false: The Clarke's (or Jake's) model specifies the autocorrelation function and power spectral density of the fading process.
Signup and view all the answers
True or false: Maximum likelihood sequence detection achieves full diversity in the presence of channel uncertainty.
Signup and view all the answers
True or false: Multipath fading in wireless communication is caused by constructive and destructive interference of the transmitted waves.
Signup and view all the answers
True or false: Small-scale fading in wireless communication is mainly caused by variations in carrier frequency.
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True or false: The time constants associated with large-scale fading are usually very short.
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True or false: Frequency diversity approaches include time-domain equalization, direct-sequence spread spectrum, and orthogonal frequency-division multiplexing (OFDM)?
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True or false: The Rician model includes only scattered paths?
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True or false: Wireless communication typically happens at very low carrier frequency?
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True or false: Fading occurs when there is constructive interference of the multipaths that contribute to a tap?
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True or false: Cooperative diversity involves users exchanging information to increase diversity?
Signup and view all the answers
True or false: The Clarke's (or Jake's) model specifies the autocorrelation function and power spectral density of the fading process?
Signup and view all the answers
True or false: Waterfilling in the frequency domain is used in frequency-selective AWGN channels?
Signup and view all the answers
True or false: Multipath fading in wireless communication is caused by constructive and destructive interference of the transmitted waves?
Signup and view all the answers
True or false: Time diversity can be obtained by interleaving and coding over symbols across different coherent time periods?
Signup and view all the answers
True or false: Repetition is a form of time diversity?
Signup and view all the answers
True or false: Frequency diversity approaches include time-domain equalization, direct-sequence spread spectrum, and orthogonal frequency-division multiplexing (OFDM)?
Signup and view all the answers
True or false: Repetition coding fully exploits the degrees of freedom in the wireless channel?
Signup and view all the answers
True or false: Maximum likelihood sequence detection achieves full diversity in the presence of channel uncertainty?
Signup and view all the answers
True or false: In fast varying channels, tap gain measurement errors have a significant impact on diversity combining performance?
Signup and view all the answers
True or false: The goal of the course is to study the fundamentals as well as new research developments in wireless communication?
Signup and view all the answers
True or false: The concepts in the course are illustrated using examples from several modern wireless systems?
Signup and view all the answers
True or false: The capacity of an AWGN channel is limited by power and bandwidth?
Signup and view all the answers
True or false: Large-scale fading refers to variations in the wireless channel due to reflections and obstructions?
Signup and view all the answers
True or false: A slow fading channel has a higher capacity than a fast fading channel?
Signup and view all the answers
True or false: Space-time codes transmit the same symbol simultaneously at the antennas?
Signup and view all the answers
True or false: Small-scale fading in wireless communication typically happens at very high carrier frequency?
Signup and view all the answers
True or false: Large-scale fading refers to variations in the wireless channel due to reflections and obstructions?
Signup and view all the answers
True or false: Multipath fading in wireless communication is caused by constructive and destructive interference of the transmitted waves?
Signup and view all the answers
True or false: The capacity of an AWGN channel is limited by power and bandwidth?
Signup and view all the answers
True or false: The Rician model includes only scattered paths?
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True or false: Wireless channels can be modeled as linear time-invariant systems?
Signup and view all the answers
True or false: BPSK modulation uses only the I-phase, while QPSK delivers 2 bits per complex symbol?
Signup and view all the answers
True or false: Frequency diversity approaches include time-domain equalization, direct-sequence spread spectrum, and orthogonal frequency-division multiplexing (OFDM)?
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True or false: The Viterbi algorithm is used for maximum likelihood sequence detection?
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True or false: The Wireless Channel varies at two spatial scales: large scale fading and small scale fading?
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