Podcast
Questions and Answers
Which type of waves are used for wireless data transmission?
Which type of waves are used for wireless data transmission?
- Visible light
- Infrared light (correct)
- Radio waves
- Microwaves
What is the speed of electromagnetic waves in space?
What is the speed of electromagnetic waves in space?
- 3 * 10^8 km/s
- 3 * 10^7 km/s
- 3 * 10^8 m/s (correct)
- 3 * 10^7 m/s
What are the two basic types of waves used in wireless communications?
What are the two basic types of waves used in wireless communications?
- Radio waves and infrared waves (correct)
- Visible light waves and radio waves
- Ultraviolet waves and radio waves
- Infrared waves and ultraviolet waves
Which type of waves are adjacent to visible light and are a better medium for data transmission?
Which type of waves are adjacent to visible light and are a better medium for data transmission?
What is required for infrared wireless systems to transmit data?
What is required for infrared wireless systems to transmit data?
Which type of infrared wireless transmission relies on reflected light?
Which type of infrared wireless transmission relies on reflected light?
What property of light is used to transmit information in infrared wireless systems?
What property of light is used to transmit information in infrared wireless systems?
Which type of communication signal does not interfere with other types of communication signals, except light?
Which type of communication signal does not interfere with other types of communication signals, except light?
What is a limitation of infrared light?
What is a limitation of infrared light?
What is the advantage of radio waves?
What is the advantage of radio waves?
What is an antenna?
What is an antenna?
What is the frequency range of the radio frequency spectrum?
What is the frequency range of the radio frequency spectrum?
What is amplitude shift keying (ASK)?
What is amplitude shift keying (ASK)?
What is phase shift keying (PSK)?
What is phase shift keying (PSK)?
Which modulation technique is used in Direct Sequence Spread Spectrum (DSSS)?
Which modulation technique is used in Direct Sequence Spread Spectrum (DSSS)?
Which one of the following is an advantage of DSSS?
Which one of the following is an advantage of DSSS?
What is the main disadvantage of DSSS compared to FHSS?
What is the main disadvantage of DSSS compared to FHSS?
Which type of communication uses different spectrum bands for radio communication?
Which type of communication uses different spectrum bands for radio communication?
Which modulation technique is used in Multi Carrier modulation?
Which modulation technique is used in Multi Carrier modulation?
Which spread spectrum technique is used in Frequency Hopping Spread Spectrum (FHSS)?
Which spread spectrum technique is used in Frequency Hopping Spread Spectrum (FHSS)?
What is the purpose of spreading the signal over a wider range of frequencies in DSSS?
What is the purpose of spreading the signal over a wider range of frequencies in DSSS?
Which one of the following is NOT a principle of radio communication?
Which one of the following is NOT a principle of radio communication?
What is the purpose of Quadrature Amplitude Modulation (QAM)?
What is the purpose of Quadrature Amplitude Modulation (QAM)?
What is the main advantage of multi-carrier modulation over single carrier modulation?
What is the main advantage of multi-carrier modulation over single carrier modulation?
What is the principle behind spread spectrum transmission?
What is the principle behind spread spectrum transmission?
What is the main difference between Frequency Hopping Spread Spectrum (FHSS) and Frequency Division Multiplexing (FDM)?
What is the main difference between Frequency Hopping Spread Spectrum (FHSS) and Frequency Division Multiplexing (FDM)?
What is the advantage of Frequency Hopping Spread Spectrum (FHSS) in reducing interference from other signals?
What is the advantage of Frequency Hopping Spread Spectrum (FHSS) in reducing interference from other signals?
What is the main characteristic of Direct Sequence Spread Spectrum (DSSS) signal?
What is the main characteristic of Direct Sequence Spread Spectrum (DSSS) signal?
What is the purpose of embedding the original data bit to the chipping code in DSSS?
What is the purpose of embedding the original data bit to the chipping code in DSSS?
True or false: Infrared light is a better medium for data transmission because it is less susceptible to interference.
True or false: Infrared light is a better medium for data transmission because it is less susceptible to interference.
True or false: Infrared wireless systems transmit data by intensity of light wave.
True or false: Infrared wireless systems transmit data by intensity of light wave.
True or false: Infrared wireless transmission can be either directed or diffused.
True or false: Infrared wireless transmission can be either directed or diffused.
True or false: Infrared wireless systems require an emitter that transmits signal and a detector that receives signal.
True or false: Infrared wireless systems require an emitter that transmits signal and a detector that receives signal.
True or false: Infrared light is adjacent to visible light but is invisible.
True or false: Infrared light is adjacent to visible light but is invisible.
True or false: Data is transmitted as electromagnetic waves in wireless communications.
True or false: Data is transmitted as electromagnetic waves in wireless communications.
True or false: Radio waves travel in space at the speed of light, which is 3 * 10^8 m/s.
True or false: Radio waves travel in space at the speed of light, which is 3 * 10^8 m/s.
True or false: Infrared light can penetrate through walls.
True or false: Infrared light can penetrate through walls.
True or false: Infrared light is absorbed by most objects.
True or false: Infrared light is absorbed by most objects.
True or false: Radio waves can travel long distances.
True or false: Radio waves can travel long distances.
True or false: Antennas are used to generate electromagnetic waves at the transmitting side.
True or false: Antennas are used to generate electromagnetic waves at the transmitting side.
True or false: The radio frequency spectrum ranges from 3 KHz to over 30 GHz.
True or false: The radio frequency spectrum ranges from 3 KHz to over 30 GHz.
True or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK).
True or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK).
True or false: Infrared wireless transmission relies on reflected light.
True or false: Infrared wireless transmission relies on reflected light.
Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal.
Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal.
Multi-carrier modulation splits the bit stream into multiple parallel streams and modulates each stream with a single carrier.
Multi-carrier modulation splits the bit stream into multiple parallel streams and modulates each stream with a single carrier.
Frequency hopping spread spectrum (FHSS) changes frequencies several times during transmission.
Frequency hopping spread spectrum (FHSS) changes frequencies several times during transmission.
Direct sequence spread spectrum (DSSS) uses expanded redundant code to transmit each data bit.
Direct sequence spread spectrum (DSSS) uses expanded redundant code to transmit each data bit.
FHSS transmits short bursts over a wide range of frequencies, reducing the impact of interference.
FHSS transmits short bursts over a wide range of frequencies, reducing the impact of interference.
DSSS transmits combinations of multiple chips at a rate faster than the data rate.
DSSS transmits combinations of multiple chips at a rate faster than the data rate.
The frequency spectrum of a DSSS signal looks similar to random noise.
The frequency spectrum of a DSSS signal looks similar to random noise.
True or false: DSSS signal appears to unintended receivers as noise?
True or false: DSSS signal appears to unintended receivers as noise?
True or false: DSSS devices are cheaper to manufacture than FHSS systems?
True or false: DSSS devices are cheaper to manufacture than FHSS systems?
True or false: Infrared and radio wave communication have different characteristics and applications?
True or false: Infrared and radio wave communication have different characteristics and applications?
True or false: DSSS uses statistical techniques and mathematical algorithms to recover the original data bit?
True or false: DSSS uses statistical techniques and mathematical algorithms to recover the original data bit?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: ASK, FSK, PSK, and QAM are all modulation techniques used in single carrier modulation?
True or false: ASK, FSK, PSK, and QAM are all modulation techniques used in single carrier modulation?
True or false: OFDM is a multi-carrier modulation technique?
True or false: OFDM is a multi-carrier modulation technique?
True or false: DSSS spreads the signal over a wider range of frequencies?
True or false: DSSS spreads the signal over a wider range of frequencies?
True or false: DSSS and FHSS are both used for radio communication?
True or false: DSSS and FHSS are both used for radio communication?
True or false: Infrared light is a much better medium for data transmission than radio waves?
True or false: Infrared light is a much better medium for data transmission than radio waves?
True or false: Infrared wireless systems transmit data by intensity of light wave?
True or false: Infrared wireless systems transmit data by intensity of light wave?
True or false: Infrared wireless transmission can be either directed or diffused?
True or false: Infrared wireless transmission can be either directed or diffused?
True or false: DSSS signal appears to unintended receivers as noise?
True or false: DSSS signal appears to unintended receivers as noise?
True or false: Infrared light is adjacent to visible light but is invisible?
True or false: Infrared light is adjacent to visible light but is invisible?
True or false: Radio waves can travel long distances?
True or false: Radio waves can travel long distances?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal.
True or false: Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal.
True or false: Multi-carrier modulation splits the bit stream into multiple parallel streams and modulates each stream with multiple carriers.
True or false: Multi-carrier modulation splits the bit stream into multiple parallel streams and modulates each stream with multiple carriers.
True or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors.
True or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors.
True or false: Frequency hopping spread spectrum (FHSS) changes frequencies several times during transmission using a hopping code.
True or false: Frequency hopping spread spectrum (FHSS) changes frequencies several times during transmission using a hopping code.
True or false: Direct sequence spread spectrum (DSSS) uses an expanded redundant code to transmit each data bit.
True or false: Direct sequence spread spectrum (DSSS) uses an expanded redundant code to transmit each data bit.
True or false: Infrared wireless transmission can be either directed or diffused.
True or false: Infrared wireless transmission can be either directed or diffused.
True or false: OFDM is a multi-carrier modulation technique.
True or false: OFDM is a multi-carrier modulation technique.
True or false: DSSS signal appears as noise to unintended receivers?
True or false: DSSS signal appears as noise to unintended receivers?
True or false: DSSS devices are more expensive to manufacture than FHSS systems?
True or false: DSSS devices are more expensive to manufacture than FHSS systems?
True or false: Infrared and radio wave communication have different characteristics and applications?
True or false: Infrared and radio wave communication have different characteristics and applications?
True or false: DSSS spreads the signal over a wider range of frequencies?
True or false: DSSS spreads the signal over a wider range of frequencies?
True or false: Infrared light is a better medium for data transmission because it is less susceptible to interference?
True or false: Infrared light is a better medium for data transmission because it is less susceptible to interference?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: DSSS devices are cheaper to manufacture than FHSS systems?
True or false: DSSS devices are cheaper to manufacture than FHSS systems?
True or false: DSSS and FHSS are both used for radio communication?
True or false: DSSS and FHSS are both used for radio communication?
True or false: Infrared and radio wave communication have different characteristics and applications?
True or false: Infrared and radio wave communication have different characteristics and applications?
True or false: Infrared light is adjacent to visible light but is invisible?
True or false: Infrared light is adjacent to visible light but is invisible?
True or false: Infrared wireless transmission can be either directed or diffused?
True or false: Infrared wireless transmission can be either directed or diffused?
True or false: Infrared light can penetrate through walls?
True or false: Infrared light can penetrate through walls?
True or false: Infrared wireless systems transmit data by intensity of light wave?
True or false: Infrared wireless systems transmit data by intensity of light wave?
True or false: DSSS signal appears to unintended receivers as noise?
True or false: DSSS signal appears to unintended receivers as noise?
True or false: DSSS devices are more expensive to manufacture than FHSS systems?
True or false: DSSS devices are more expensive to manufacture than FHSS systems?
True or false: Infrared light can penetrate through walls?
True or false: Infrared light can penetrate through walls?
True or false: Infrared light does not penetrate walls?
True or false: Infrared light does not penetrate walls?
True or false: Infrared light is absorbed by most objects?
True or false: Infrared light is absorbed by most objects?
True or false: Radio waves can penetrate most solid objects?
True or false: Radio waves can penetrate most solid objects?
True or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK)?
True or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK)?
True or false: Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal?
True or false: Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal?
True or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors?
True or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors?
True or false: Frequency Hopping Spread Spectrum (FHSS) transmits short bursts over a wide range of frequencies, reducing the impact of interference?
True or false: Frequency Hopping Spread Spectrum (FHSS) transmits short bursts over a wide range of frequencies, reducing the impact of interference?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: Antennas are used to generate electromagnetic waves at the transmitting side.
True or false: Antennas are used to generate electromagnetic waves at the transmitting side.
True or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors.
True or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors.
True or false: DSSS signal appears to unintended receivers as noise?
True or false: DSSS signal appears to unintended receivers as noise?
True or false: Infrared light is adjacent to visible light but is invisible.
True or false: Infrared light is adjacent to visible light but is invisible.
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: FHSS and DSSS are both spread spectrum techniques?
True or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors?
True or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors?
True or false: DSSS signal appears to unintended receivers as noise?
True or false: DSSS signal appears to unintended receivers as noise?
True or false: Infrared wireless transmission relies on reflected light.
True or false: Infrared wireless transmission relies on reflected light.
True or false: DSSS devices are cheaper to manufacture than FHSS systems?
True or false: DSSS devices are cheaper to manufacture than FHSS systems?
True or false: OFDM is a multi-carrier modulation technique?
True or false: OFDM is a multi-carrier modulation technique?
True or false: Infrared light is adjacent to visible light but is invisible.
True or false: Infrared light is adjacent to visible light but is invisible.
True or false: The radio frequency spectrum ranges from 3 KHz to over 30 GHz.
True or false: The radio frequency spectrum ranges from 3 KHz to over 30 GHz.
True or false: Infrared and radio wave communication have different characteristics and applications?
True or false: Infrared and radio wave communication have different characteristics and applications?
True or false: Antennas are used to generate electromagnetic waves at the transmitting side.
True or false: Antennas are used to generate electromagnetic waves at the transmitting side.
Wireless signals are transmitted as ______ waves.
Wireless signals are transmitted as ______ waves.
Infrared light is a much better medium for ______ transmission.
Infrared light is a much better medium for ______ transmission.
Infrared wireless systems transmit data by intensity of ______ wave.
Infrared wireless systems transmit data by intensity of ______ wave.
Infrared wireless transmission can be either ______ or diffused.
Infrared wireless transmission can be either ______ or diffused.
Quadrature amplitude modulation (QAM) modulates both the amplitude and ______ of the carrier signal.
Quadrature amplitude modulation (QAM) modulates both the amplitude and ______ of the carrier signal.
Frequency hopping spread spectrum (FHSS) changes frequencies several times during ______ using a hopping code.
Frequency hopping spread spectrum (FHSS) changes frequencies several times during ______ using a hopping code.
Direct Sequence Spread Spectrum (DSSS) uses expanded redundant code to transmit each data ______.
Direct Sequence Spread Spectrum (DSSS) uses expanded redundant code to transmit each data ______.
Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency ______, resulting in less interference and fewer errors.
Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency ______, resulting in less interference and fewer errors.
______ or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors?
______ or false: Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency band, resulting in less interference and fewer errors?
______ or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK)?
______ or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK)?
What is the main difference between Frequency Hopping Spread Spectrum (FHSS) and Frequency Division Multiplexing (FDM)?
What is the main difference between Frequency Hopping Spread Spectrum (FHSS) and Frequency Division Multiplexing (FDM)?
Frequency Shift Keying (FSK) is a binary modulation technique that changes the ______ of the carrier signal to represent 1 or 0 bit.
Frequency Shift Keying (FSK) is a binary modulation technique that changes the ______ of the carrier signal to represent 1 or 0 bit.
Phase Shift Keying (PSK) is a modulation technique where the transmitter varies the starting point of the wave, such as phase 0 to send 0 and phase 180 to send 1. Quaternary Phase Shift Keying (QPSK) uses ______ different phases to send bits 00, 01, 10, and 11.
Phase Shift Keying (PSK) is a modulation technique where the transmitter varies the starting point of the wave, such as phase 0 to send 0 and phase 180 to send 1. Quaternary Phase Shift Keying (QPSK) uses ______ different phases to send bits 00, 01, 10, and 11.
Amplitude Shift Keying (ASK) is a binary modulation technique that changes the ______ (e.g., amplitude) of the carrier signal to represent 1 or 0 bit.
Amplitude Shift Keying (ASK) is a binary modulation technique that changes the ______ (e.g., amplitude) of the carrier signal to represent 1 or 0 bit.
Infrared light does not penetrate ______. Signals are confined to a room.
Infrared light does not penetrate ______. Signals are confined to a room.
