WorksheetsMultiple Choice Questions (MCQs)
Total questions: 40
Worksheet time: 20mins
In a noise-limited system, the main limiting factor for coverage is:
Cochannel interference
Adjacent-channel interference
Background noise
Intermodulation distortion
Doubling the transmitted power increases the gain by:
1 dB
2 dB
3 dB
6 dB
A low-noise receiver helps in:
Increasing transmission power
Receiving weaker signals from longer distances
Reducing transmitted noise
Increasing multipath fading
A diversity receiver is mainly used to:
Reduce cochannel interference
Reduce multipath fading
Increase bandwidth
Improve handoff speed
To enlarge coverage or fill coverage holes, we use:
Channel borrowing
Repeaters or enhancers
Frequency hopping
Power control
Engineering the antenna pattern is done to:
Increase handoff rate
Cover a desired service area
Reduce noise
Avoid channel sharing
In an adjacent-channel assignment, interference can occur among:
Non-adjacent channels
Channels separated by 10 MHz
Neighboring channels on each side
Different frequency bands
Channel sharing provides:
Long-term traffic relief
Short-term traffic relief
Permanent additional channels
Frequency reuse elimination
Channel borrowing is typically used:
On a short-term basis
On a long-term basis
For every call setup
To replace frequency reuse
The hybrid channel assignment combines:
FCA and DCA
DCA and FBCA
FCA and BCA
Sectorization and FCA
In forcible-borrowing channel assignment (FBCA),
Channels are borrowed only if idle
Borrowing is avoided during congestion
Active channels may be forcibly borrowed
Borrowing occurs only between sites
In an overlay-underlay system, the underlaid cell serves:
High-mobility users
Low-mobility or indoor users
Inter-cell interference
Frequency reuse avoidance
The handoff between overlay and underlay cells depends on:
Power difference between users
Signal strength thresholds (L1 and L2)
Distance from base station
Channel reuse pattern
Coverage-hole fillers use:
Repeaters and enhancers
Macro base stations
High-gain antennas only
Frequency hopping
The wideband enhancer amplifies:
Only the desired signal
Only noise
Both signal and noise
Only uplink signals
Small cells such as microcells or picocells help in:
Increasing power per user
Increasing capacity and coverage in dense areas
Reducing call handoffs
Eliminating frequency reuse
Narrowbeam sectors are used to:
Decrease channel capacity
Increase traffic capacity
Eliminate cell splitting
Reduce antenna height
In a K = 7 reuse pattern, there are:
7 sectors
21 sectors
12 sectors
24 sectors
The narrowbeam concept may cause:
Reduced handoffs
Many unnecessary handoffs
Elimination of interference
Fixed antenna orientation
Intelligent cells adjust transmitted power based on:
Temperature variation
Distance and user location
Antenna height
Base station type
The goal of power delivery control in intelligent cells is to:
Increase interference
Reduce power consumption and interference
Increase bandwidth
Improve modulation complexity
Power control helps to maintain:
Constant transmitted power
Constant received signal quality
Constant antenna gain
Fixed carrier frequency
4G systems are primarily based on:
Circuit-switched technology
Packet-switched IP-based architecture
GSM backbone
Analog transmission
The data rate target for 4G systems is approximately:
384 kbps
2 Mbps
100 Mbps (mobile) and 1 Gbps (stationary)
10 Gbps
The main enabling technologies for 4G include:
FDMA and TDMA
MIMO and OFDM
CDMA and AMPS
FDM and PCM
The core network of 4G LTE is known as:
EPC (Evolved Packet Core)
BSC
MSC
PSTN
Intelligent cells are mainly used to:
Reduce power and increase coverage
Reduce interference and increase capacity
Increase antenna size
Simplify modulation
A coverage hole filler is an example of:
Conventional base station
Intelligent cell technique
Frequency reuse technique
Diversity combining
Intelligent cell systems are particularly useful in:
Rural areas only
Dense urban and indoor environments
Satellite links
CDMA separates users by:
Frequency
Time
Codes
Space
The main advantage of CDMA over TDMA is:
Narrow bandwidth
Better frequency reuse and interference rejection
Lower synchronization
Simpler modulation
In CDMA, multiple users transmit:
On different frequencies
On the same frequency with different codes
On different time slots
On different subcarriers
The RAKE receiver in CDMA helps in:
Channel coding
Combining multipath signals
Frequency hopping
Error detection only
The gain achieved by MIMO due to multiple transmission paths is called:
Frequency gain
Diversity gain
Power gain
Doppler gain
MIMO systems improve throughput by using:
Multiple frequencies
Spatial multiplexing
Code division
TDMA slots
The performance of MIMO depends mainly on:
Antenna separation and channel correlation
Transmitter power
Modulation scheme only
Duplexing method
The 60 GHz band belongs to which frequency range?
UHF
SHF
EHF (Extremely High Frequency)
VHF
The wavelength of a 60 GHz signal is approximately:
5 cm
1 cm
0.5 cm
10 cm
60 GHz systems are suitable for:
Long-distance rural coverage
Short-range, high data rate communication
Satellite communications
Underwater communication
The main limitation of 60 GHz cellular systems is:
High noise figure
Severe oxygen absorption and rain attenuation
High power requirement only
Lack of spectrum availability
