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Cellular systems and PCS systems are widely used in U.S. Choose one answer. a. Both cellular and PCS operate around 800 MHz b. Both cellular and PCS operate around 2 GHz c. Cellular systems operate...

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Cellular systems and PCS systems are widely used in U.S.
Choose one answer.
a. Both cellular and PCS operate around 800 MHz
b. Both cellular and PCS operate around 2 GHz
c. Cellular systems operate around 800 MHz; PCS systems operate around 2 GHz
d. Cellular systems operate around 2 GHz; PCS systems operate around 800 MHz

Received signal power P decreases with increased distance d
Choose one answer.
a. in free space and urban area, P is proportional to d^-4
b. in free space and urban area, P is proportional to d^-2
c. in free space, P is proportional to d^-4; in urban area, P is proportional to d^-2
d. in free space, P is proportional to d^-2; in urban area, P is proportional to d^-4

Frequency reuse is achieved through cell/cluster structures
Choose one answer.
a. A service provider typically limits its operation within one cell
b. A service provider typically limits its operation within one cluster
c. A service provider typically operates in multiple clusters
d. None of the above statement is correct

Handoff occurs when a mobile station moves from one cell to another
Choose one answer.
a. If handoff occurs too early, call dropping rate may increase
b. If handoff occurs too early, handoff rate may increase
c. If handoff occurs too late, call dropping rate may decrease
d. If handoff occurs too late, handoff rate may increase

Cochannel interference is due to
Choose one answer.
a. Signal power attenuation
b. Out-of-band user interference
c. High noise level
d. Frequency reuse

Cell-splitting and sectoring increase system capacity
Choose one answer.
a. Cell-splitting reduces cochannel interference
b. Cell-splitting increases the number of base stations required
c. Sectoring increases the number of base stations required
d. None of the above statement is correct

In wireless channels, propagation mechanisms include reflection, diffraction and scattering
Choose one answer.
a. Reflection occurs when the signal propagates around curved surface
b. Diffraction occurs around rough surfaces
c. Scattering occurs along a smooth surface
d. None of the above statement is correct

Rayleigh fading versus Rician fading
Choose one answer.
a. Rayleigh fading is a special case of Rician fading
b. Rician fading is a special case of Rayleigh fading
c. Both Rayleigh fading and Rician fading characterize long-term fading
d. Both Rayleigh fading and Rician fading characterize propagation without LOS

FEC versus ARQ
Choose one answer.
a. ARQ typically requires more redundancy in coding
b. ARQ requires feedback
c. FEC requires feedback
d. FEC is a reactive scheme for error recovery

Different ARQ schemes have different efficiencies
Choose one answer.
a. SW is more efficient than GBN
b. GBN is more efficient than SR
c. SR is more efficient than SW
d. None of the above statement is correct

There are various multiple access schemes
Choose one answer.
a. Different users use different time slots in FDMA
b. Different users use different frequency channels in TDMA
c. Different users use different orthogonal codes in CDMA
d. None of the above statement is correct

Pure Aloha versus slotted Aloha
Choose one answer.
a. Pure Aloha has higher throughput
b. Slotted Aloha is easier to implement
c. Pure Aloha and slotted Aloha reach their peak throughput under the same traffic load
d. None of the above statement is correct

There are various versions of CSMA
Choose one answer.
a. In non-persistent CSMA, the terminal does not sense the channel
b. In 1-persistent CSMA, the terminal stops sensing the channel when the channel is busy
c. In p-persistent CSMA, the terminal sends packet immediately when channel becomes idle
d. None of the statements are correct

Wireless system capacity is limited by many factors. It is
Choose one answer.
a. bandwidth-limited because of channel fading
b. range-limited because of cochannel interference
c. interference-limited because of frequency reuse
d. None of the above statement is correct

Open-loop versus close-loop power control
Choose one answer.
a. In open-loop power control, MS determines its transmit power based on BS command
b. In open-loop power control, MS determines its transmit power based on its received power level
c. In close-loop power control, MS determines its transmit power based on its received power level
d. None of the above statement is correct

In radio resource management, QoS can be achieved through
Choose one answer.
a. transmitting higher power level
b. reducing transmit data rate
c. prioritizing real-time traffic over non-real-time traffic
d. None of the above statement is correct
Answered Same DayDec 31, 2021

Solution

Robert answered on Dec 31 2021
80 Votes
Cellular systems and PCS systems are widely used in U.S.
Choose one answer.

a. Both cellular and PCS operate around 800 MHz

. Both cellular and PCS operate around 2 GHz

c. Cellular systems operate around 800 MHz; PCS systems operate around 2 GHz

d. Cellular systems operate around 2 GHz; PCS systems operate around 800 MHz
Received signal power P decreases with increased distance d
Choose one answer.

a. in free space and u
an area, P is proportional to d^-4

. in free space and u
an area, P is proportional to d^-2

c. in free space, P is proportional to d^-4; in u
an area, P is proportional to d^-2

d. in free space, P is proportional to d^-2; in u
an area, P is proportional to d^-4
Frequency reuse is achieved through cell/cluster structures
Choose one answer.

a. A service provider typically limits its operation within one cell

. A service provider typically limits its operation within one cluste

c. A service provider typically operates in multiple clusters

d. None of the above statement is co
ect
Handoff occurs when a mobile station moves from one cell to another
Choose one answer.

a. If handoff occurs too early, call dropping rate may increase

. If handoff occurs too early, handoff rate may increase

c. If handoff occurs too late, call dropping rate may decrease

d. If handoff occurs too late, handoff rate may increase
Cochannel interference is due to
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