A Quiz On Mobile Communication! Trivia

20 Questions | By Gdeisat | Last updated: Mar 21, 2022 | Total Attempts: 554

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A Quiz On Mobile Communication! Trivia - Quiz

Questions and Answers

1.

Power-limited region is when
- A.
  
  Bandwidth utilization factor is less than 1
- B.
  
  Bandwidth utilization factor is greater than 1
2.

Bandwidth-limited region is when
- A.
  
  Bandwidth utilization factor is greater than 1
- B.
  
  Bandwidth utilization factor is less than 1
3.

The most efficient method to increase the channel capacity operates in a power-limited region is
- A.
  
  Increase signal to noise ratio at the receiver
- B.
  
  Use MIMO at the receiver and the transmitter
- C.
  
  Increase the channel bandwidth
- D.
  
  Increase the transmitter power
- E.
  
  Use multiple antennas at the receiver side (receiver antenna diversity)
- F.
  
  Use multiple antennas at the transmitter side (beam focusing)
- G.
  
  Reduce the noise power at the receiver (use advanced receiver RF design)
4.

The most efficient method to increase the channel capacity operates in a bandwidth-limited region is
- A.
  
  Increase signal to noise ratio at the receiver
- B.
  
  Use MIMO at the receiver and the transmitter
- C.
  
  Increase the channel bandwidth
- D.
  
  Increase the transmitter power
- E.
  
  Use multiple antennas at the receiver side (receiver antenna diversity)
- F.
  
  Use multiple antennas at the transmitter side (beam focusing)
- G.
  
  Reduce the noise power at the receiver (use advanced receiver RF design)
5.

Interference is the dominant source of radio-link impairment in mobile communications.
- A.
  
  True
- B.
  
  False
6.

Radio link bandwidth utilization factor is defined as the transmitted data rate divided by the available channel bandwidth
- A.
  
  True
- B.
  
  False
7.

Combining 16QAM or 64QAM with channel coding may produce less bit-error probability, compared to QPSK.
- A.
  
  True
- B.
  
  False
8.

16QAM or 64QAM uses more bandwidth and produces less bit-error probability compared to QPSK.
- A.
  
  True
- B.
  
  False
9.

The modulation scheme that has the highest variations in instantaneous transmit power is
- A.
  
  64QAM
- B.
  
  QPSK
- C.
  
  16QAM
10.

Even though the large variations in instantaneous transmit power for higher-order modulation schemes, the transmit power amplifier can operate with 100% efficiency.
- A.
  
  True
- B.
  
  False
11.

The higher-order modulation schemes are more suitable for the downlink compared to the uplink due to variations in instantaneous transmit power.
- A.
  
  True
- B.
  
  False
12.

In order to provide high data rates as efficiently as possible in terms of required signal-to-noise ratio, the transmission bandwidth should be at least of the same order as the data rates to be provided (bandwidth utilization factor =1).
- A.
  
  True
- B.
  
  False
13.

Time dispersion
- A.
  
  Time dispersion occurs when the transmitted signal propagates to the receiver via multiple paths with different delays.
- B.
  
  Is the time required for a data symbol to propagate from the base station to the terminal mobile
- C.
  
  Is the delay of a radio packet
14.

Frequency selectivity
- A.
  
  Is the frequency response of a channel that suffers of a time dispersion problem
- B.
  
  Is the Doppler dispersion
- C.
  
  Is the bandwidth of the channel that is selected in frequency division multiplexing
- D.
  
  None of the above
15.

It is easier to design equalizers for wider bandwidth channels than narrower bandwidth channels?
- A.
  
  True
- B.
  
  False
16.

The bandwidth of a WCDMA signal is
- A.
  
  5 MHz
- B.
  
  1 MHz
- C.
  
  15 MHz
- D.
  
  10 MHz
17.

The reasons for using OFDM in 4G systems are
- A.
  
  Better performance against time dispersion
- B.
  
  Better performance against frequency selectivity
- C.
  
  The design for an equalizer is easier for bandwidths larger than 5 MHz
- D.
  
  It can perform well even at the edge of a cell
18.

One of the main reasons for using multi-carrier for transmitting high data rates is to avoid the frequency selectivity problem.
- A.
  
  True
- B.
  
  False
19.

WCDMA/HSPA uses
- A.
  
  Multicarrier transmission
- B.
  
  One carrier transmission