Single vs Multi-Carrier Modulation Quiz
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Questions and Answers

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?

  • 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?

  • 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?

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

    What is required for infrared wireless systems to transmit data?

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

    Which type of infrared wireless transmission relies on reflected light?

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

    What property of light is used to transmit information in infrared wireless systems?

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

    Which type of communication signal does not interfere with other types of communication signals, except light?

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

    What is a limitation of infrared light?

    <p>Can cover a range of only 50 feet (D)</p> Signup and view all the answers

    What is the advantage of radio waves?

    <p>Penetrate most solid objects (D)</p> Signup and view all the answers

    What is an antenna?

    <p>A length of copper wire (D)</p> Signup and view all the answers

    What is the frequency range of the radio frequency spectrum?

    <p>3 KHz to over 30 GHz (C)</p> Signup and view all the answers

    What is amplitude shift keying (ASK)?

    <p>A binary modulation technique that changes height of carrier signal (D)</p> Signup and view all the answers

    What is phase shift keying (PSK)?

    <p>A modulation technique that varies the starting point of wave (A)</p> Signup and view all the answers

    Which modulation technique is used in Direct Sequence Spread Spectrum (DSSS)?

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

    Which one of the following is an advantage of DSSS?

    <p>DSSS signal appears as noise to unintended receivers (A)</p> Signup and view all the answers

    What is the main disadvantage of DSSS compared to FHSS?

    <p>DSSS devices are more expensive to manufacture (D)</p> Signup and view all the answers

    Which type of communication uses different spectrum bands for radio communication?

    <p>Radio wave communication (B)</p> Signup and view all the answers

    Which modulation technique is used in Multi Carrier modulation?

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

    Which spread spectrum technique is used in Frequency Hopping Spread Spectrum (FHSS)?

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

    What is the purpose of spreading the signal over a wider range of frequencies in DSSS?

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

    Which one of the following is NOT a principle of radio communication?

    <p>Spread spectrum techniques (A)</p> Signup and view all the answers

    What is the purpose of Quadrature Amplitude Modulation (QAM)?

    <p>To modulate amplitude and phase of a carrier signal (B)</p> Signup and view all the answers

    What is the main advantage of multi-carrier modulation over single carrier modulation?

    <p>It reduces interference and errors in transmission (D)</p> Signup and view all the answers

    What is the principle behind spread spectrum transmission?

    <p>Spreading the narrow-band signal over a broader portion of the frequency band (D)</p> Signup and view all the answers

    What is the main difference between Frequency Hopping Spread Spectrum (FHSS) and Frequency Division Multiplexing (FDM)?

    <p>FHSS changes frequencies several times during transmission, while FDM uses fixed carrier frequencies (A)</p> Signup and view all the answers

    What is the advantage of Frequency Hopping Spread Spectrum (FHSS) in reducing interference from other signals?

    <p>FHSS transmits short bursts over a wide range of frequencies, reducing the extent of interference (B)</p> Signup and view all the answers

    What is the main characteristic of Direct Sequence Spread Spectrum (DSSS) signal?

    <p>It looks similar to random noise in the frequency spectrum (B)</p> Signup and view all the answers

    What is the purpose of embedding the original data bit to the chipping code in DSSS?

    <p>To modulate the data bit twice using a modulation technique (A)</p> Signup and view all the answers

    True or false: Infrared light is a better medium for data transmission because it is less susceptible to interference.

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

    True or false: Infrared wireless systems transmit data by intensity of light wave.

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

    True or false: Infrared wireless transmission can be either directed or diffused.

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

    True or false: Infrared wireless systems require an emitter that transmits signal and a detector that receives signal.

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

    True or false: Infrared light is adjacent to visible light but is invisible.

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

    True or false: Data is transmitted as electromagnetic waves in wireless communications.

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

    True or false: Radio waves travel in space at the speed of light, which is 3 * 10^8 m/s.

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

    True or false: Infrared light can penetrate through walls.

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

    True or false: Infrared light is absorbed by most objects.

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

    True or false: Radio waves can travel long distances.

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

    True or false: Antennas are used to generate electromagnetic waves at the transmitting side.

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

    True or false: The radio frequency spectrum ranges from 3 KHz to over 30 GHz.

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

    True or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK).

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

    True or false: Infrared wireless transmission relies on reflected light.

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

    Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal.

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

    Multi-carrier modulation splits the bit stream into multiple parallel streams and modulates each stream with a single carrier.

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

    Frequency hopping spread spectrum (FHSS) changes frequencies several times during transmission.

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

    Direct sequence spread spectrum (DSSS) uses expanded redundant code to transmit each data bit.

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

    FHSS transmits short bursts over a wide range of frequencies, reducing the impact of interference.

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

    DSSS transmits combinations of multiple chips at a rate faster than the data rate.

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

    The frequency spectrum of a DSSS signal looks similar to random noise.

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

    True or false: DSSS signal appears to unintended receivers as noise?

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

    True or false: DSSS devices are cheaper to manufacture than FHSS systems?

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

    True or false: Infrared and radio wave communication have different characteristics and applications?

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

    True or false: DSSS uses statistical techniques and mathematical algorithms to recover the original data bit?

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

    True or false: FHSS and DSSS are both spread spectrum techniques?

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

    True or false: ASK, FSK, PSK, and QAM are all modulation techniques used in single carrier modulation?

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

    True or false: OFDM is a multi-carrier modulation technique?

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

    True or false: DSSS spreads the signal over a wider range of frequencies?

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

    True or false: DSSS and FHSS are both used for radio communication?

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

    True or false: Infrared light is a much better medium for data transmission than radio waves?

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

    True or false: Infrared wireless systems transmit data by intensity of light wave?

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

    True or false: Infrared wireless transmission can be either directed or diffused?

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

    True or false: DSSS signal appears to unintended receivers as noise?

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

    True or false: Infrared light is adjacent to visible light but is invisible?

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

    True or false: Radio waves can travel long distances?

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

    True or false: FHSS and DSSS are both spread spectrum techniques?

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

    True or false: Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal.

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

    True or false: Multi-carrier modulation splits the bit stream into multiple parallel streams and modulates each stream with multiple carriers.

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

    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.

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

    True or false: Frequency hopping spread spectrum (FHSS) changes frequencies several times during transmission using a hopping code.

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

    True or false: Direct sequence spread spectrum (DSSS) uses an expanded redundant code to transmit each data bit.

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

    True or false: Infrared wireless transmission can be either directed or diffused.

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

    True or false: OFDM is a multi-carrier modulation technique.

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

    True or false: DSSS signal appears as noise to unintended receivers?

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

    True or false: DSSS devices are more expensive to manufacture than FHSS systems?

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

    True or false: Infrared and radio wave communication have different characteristics and applications?

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

    True or false: DSSS spreads the signal over a wider range of frequencies?

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

    True or false: Infrared light is a better medium for data transmission because it is less susceptible to interference?

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

    True or false: FHSS and DSSS are both spread spectrum techniques?

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

    True or false: DSSS devices are cheaper to manufacture than FHSS systems?

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

    True or false: DSSS and FHSS are both used for radio communication?

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

    True or false: Infrared and radio wave communication have different characteristics and applications?

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

    True or false: Infrared light is adjacent to visible light but is invisible?

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

    True or false: Infrared wireless transmission can be either directed or diffused?

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

    True or false: Infrared light can penetrate through walls?

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

    True or false: Infrared wireless systems transmit data by intensity of light wave?

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

    True or false: DSSS signal appears to unintended receivers as noise?

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

    True or false: DSSS devices are more expensive to manufacture than FHSS systems?

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

    True or false: Infrared light can penetrate through walls?

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

    True or false: Infrared light does not penetrate walls?

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

    True or false: Infrared light is absorbed by most objects?

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

    True or false: Radio waves can penetrate most solid objects?

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

    True or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK)?

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

    True or false: Quadrature amplitude modulation (QAM) modulates both the amplitude and phase of the carrier signal?

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

    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?

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

    True or false: Frequency Hopping Spread Spectrum (FHSS) transmits short bursts over a wide range of frequencies, reducing the impact of interference?

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

    True or false: FHSS and DSSS are both spread spectrum techniques?

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

    True or false: Antennas are used to generate electromagnetic waves at the transmitting side.

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

    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.

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

    True or false: DSSS signal appears to unintended receivers as noise?

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

    True or false: Infrared light is adjacent to visible light but is invisible.

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

    True or false: FHSS and DSSS are both spread spectrum techniques?

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

    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?

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

    True or false: DSSS signal appears to unintended receivers as noise?

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

    True or false: Infrared wireless transmission relies on reflected light.

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

    True or false: DSSS devices are cheaper to manufacture than FHSS systems?

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

    True or false: OFDM is a multi-carrier modulation technique?

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

    True or false: Infrared light is adjacent to visible light but is invisible.

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

    True or false: The radio frequency spectrum ranges from 3 KHz to over 30 GHz.

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

    True or false: Infrared and radio wave communication have different characteristics and applications?

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

    True or false: Antennas are used to generate electromagnetic waves at the transmitting side.

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

    Wireless signals are transmitted as ______ waves.

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

    Infrared light is a much better medium for ______ transmission.

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

    Infrared wireless systems transmit data by intensity of ______ wave.

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

    Infrared wireless transmission can be either ______ or diffused.

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

    Quadrature amplitude modulation (QAM) modulates both the amplitude and ______ of the carrier signal.

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

    Frequency hopping spread spectrum (FHSS) changes frequencies several times during ______ using a hopping code.

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

    Direct Sequence Spread Spectrum (DSSS) uses expanded redundant code to transmit each data ______.

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

    Spread spectrum transmission spreads a narrow-band signal over a broader portion of the frequency ______, resulting in less interference and fewer errors.

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

    ______ 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?

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

    ______ or false: Digital modulation techniques include Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK)?

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

    What is the main difference between Frequency Hopping Spread Spectrum (FHSS) and Frequency Division Multiplexing (FDM)?

    <p>FHSS changes frequencies several times during transmission using a hopping code, while FDM divides the available frequency band into multiple subchannels.</p> Signup and view all the answers

    Frequency Shift Keying (FSK) is a binary modulation technique that changes the ______ of the carrier signal to represent 1 or 0 bit.

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

    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.

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

    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.

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

    Infrared light does not penetrate ______. Signals are confined to a room.

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

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