A Quiz On Mobile Communication! Trivia
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- 1.Radio link bandwidth utilization factor is defined as the transmitted data rate divided by the available channel bandwidth
- A.
True
- B.
False
- 2.Power-limited region is when
- A.
Bandwidth utilization factor is less than 1
- B.
Bandwidth utilization factor is greater than 1
- 3.Bandwidth-limited region is when
- A.
Bandwidth utilization factor is greater than 1
- B.
Bandwidth utilization factor is less than 1
- 4.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)
- 5.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)
- 6.Interference is the dominant source of radio-link impairment in mobile communications.
- 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
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