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WorksheetsWireless Communication
Total questions: 25
Worksheet time: 10mins
LOs means
Line Of Sight
Loss of Sight
Line of scale
Choose which is Diffraction ...
Application of Wireless Communication
Mobile Communication
Satellite Communication
Fiber Optics communication
radar communication
Propagation models are
Free Space
Two ray
both a and b
none of the above
Advantages of Wireless communication
Cost effectiveness
longer distance
security
mobility
Radio waves are used in communications
True
False
The D/R ratio in cellular design is used to characterize
cell splitting
frequency reuse
cell sector
sectorized antenna
What are the three different types of multiplexing?
TDMA, FDMA, CDMA
TDAM, FDMA, SDMA
TDD, FDMA, CDMA
FDD, TDD, TDMA
What is the minimum sampling rate required in order to recovered the information signal?
The sampling rate must be at least the same as the highest frequency of the intelligence signal.
The sampling rate must be at least 2 times the highest frequency of the intelligence signal.
The sampling rate must be at least 1.5 times the highest frequency of the intelligence signal.
The sampling rate must be at least 3 times the highest frequency of the intelligence signal.
Which effect is widespread in adjacent-channel interference especially after the reception of a weak signal by a mobile user from the base-station?
A.Near-far effect
B.Doppler’s effect
C.Capture effect
D.Kendall effect
Which antennas are used at the center of the cells for the w
Omni-directional antenna
Sectored directional antennas
Both A and B
None of the above
Co-channel reuse ratio (Q) is
3√N
.√3N
√3 ( N)
N√3
The propagation model that estimates radio coverage of transmitter is called
Large scale propagation model
Small scale propagation model
Fading Model
Okumura Model
The speed of radio wave in free space is
3 x 106 metres/second
3 x 108 metres/second
3 x 106 miles/second
3 x 108 miles/second
Radio waves sometimes bend around the corners due to
Reflection
Diffusion
Refraction
Diffraction
Which of the following is the phenomenon caused when Radio waves travel in two or more paths during propagation and produce slowly-changing phase differences between signals?
Absorption
Fading
Baffling
skip
The effects of small scale multipath propagation are
1. Changes in signal strength
2. Random frequency modulation
3. Time dispersion
1 and 2 are correct
1 and 3 are correct
2 and 3 are correct
All the three are correct
Hexagon shape is used for radio coverage for a cell because
It uses the maximum area for coverage
Fewer number of cells are required
It approximates circular radiation pattern
All of the above
Delay in handoffs is caused due to
Weak signal conditions
High traffic conditions
Un availability of the channel
All of the above
OFDMA stands for ________
a. omnidirectional frequency division multiple access
b. orthogonal frequency duplex multiple access
c. orthogonal frequency divider multiple access
d. orthogonal frequency division multiple access
Specifications for a wireless LAN are called
Standard 802.3z
Standard 802.3u
Project 802.3
IEEE 802.11
Which of the following uses wireless as the mode of communication for transferring or exchanging data between various mobiles over a short-range?
a. Ad hoc computing
b. Mobile computing
c. Bluetooth technology
d. Microwave
