Modulation and Communication Techniques Quiz

Which of the following is a form of digital modulation where the amplitude of a carrier signal is varied?

• ASK

• PSK

• FSK

• MSK

In PSK, how does the phase of the carrier signal change?

• Randomly

• According to a frequency-shift keying pattern

• Based on binary data

• By modulating the amplitude

What is the primary advantage of MSK over other modulation techniques?

• Higher data rates

• Reduced bandwidth

• Lower bit error rate

• Easier synchronization

Which modulation technique uses two frequencies to represent binary data?

• ASK

• PSK

• FSK

• MSK

In Direct Sequence Spread Spectrum (DSSS), what is used to spread the signal?

• Frequency-hopping

• A pseudo-random code

• Orthogonal sequences

• Time division multiplexing

What is the main difference between DSSS and FHSS?

• DSSS spreads the signal in time, FHSS spreads it in frequency

• FHSS provides higher security than DSSS

• FHSS uses a larger bandwidth than DSSS

• DSSS requires less power compared to FHSS

Which of the following is a key characteristic of frequency-hopping spread spectrum (FHSS)?

• Wideband transmission

• Constant carrier frequency

• Changing frequencies according to a predefined pattern

• No modulation involved

In SDMA, what is primarily divided among users to avoid interference?

• Time

• Frequency

• Space

• Code

Which of the following is not true about FDMA?

• Frequency channels are divided

• Users can transmit simultaneously

• Guard bands are used to prevent overlap

• All users share the same frequency

TDMA is primarily based on:

• Assigning different time slots to each user

• Using different frequency bands

• Sharing a single space

• Dividing the bandwidth into codes