fhss dsss

What is the primary mechanism used to combat interference in Frequency Hopping Spread Spectrum (FHSS)?

• Increased power transmission

• Channel coding

• Rapidly changing frequencies

• Narrowband modulation

In Direct Sequence Spread Spectrum (DSSS), how is data transmitted?

• By rapidly switching between multiple channels

• By spreading the signal across a wide frequency band

• By encoding the data in time-domain chips

• By utilizing frequency modulation

Which of the following is a key advantage of Frequency Hopping Spread Spectrum (FHSS) in terms of security?

• Higher data transfer rates

• Immunity to multipath fading

• Difficulty of interception and jamming

• Lower power consumption

How does Direct Sequence Spread Spectrum (DSSS) achieve resistance against narrowband interference?

• By using a large number of narrowband channels

• By spreading the signal over a wide frequency band

• By increasing the power of the transmitted signal

• By employing advanced error correction techniques

In Frequency Hopping Spread Spectrum (FHSS), how often does the transmitter change its operating frequency?

• Continuously

• Infrequently

• Periodically and in a predetermined sequence

• Only in response to interference

What is the primary drawback of Frequency Hopping Spread Spectrum (FHSS) in terms of data rate?

• Limited coverage range

• Susceptibility to interference

• Lower data transfer rates compared to DSSS

• High power consumption

Which spread spectrum technique is more resilient to narrowband interference?

• Frequency Hopping Spread Spectrum (FHSS)
  

• Direct Sequence Spread Spectrum (DSSS)
  

• Both are equally resilient

• Neither is resilient

What is a characteristic feature of Frequency Hopping Spread Spectrum (FHSS) systems in terms of spectral efficiency?

• Higher spectral efficiency compared to DSSS

• Lower spectral efficiency compared to DSSS

• Spectral efficiency is not affected by the spread spectrum technique

• Variable spectral efficiency based on interference levels

How does Frequency Hopping Spread Spectrum (FHSS) contribute to coexistence with other wireless systems?

• By avoiding the use of shared frequency bands

• By dynamically adapting to the available spectrum

• By using a fixed frequency for all communications

• By transmitting at higher power levels

Which spread spectrum technique is more suitable for applications requiring high data rates and robustness against interference?

• Frequency Hopping Spread Spectrum (FHSS)

• Direct Sequence Spread Spectrum (DSSS)
  

• Both FHSS and DSSS are equally suitable

• Neither FHSS nor DSSS is suitable