WorksheetsEC8652 WC IAT 2 PART-B
Total questions: 15
Worksheet time: 15mins
Name
Class
Date
1.
1.For a cellular system, if there are N cells and each cell is allocated k channel. What is the total number of available radio channels, S?(CO2)(B4)
a)
S=k*N
b)
S=k/N
c)
S=N/k
d)
S=k^N
2.
2.A spectrum of 30 MHz is allocated to a cellular system which uses two 25 KHz simplex channels to provide full duplex voice channels. What is the number of channels available per cell for 4 cell reuse factor?(CO2)(B5)
a)
150 Channels
b)
100 Channels
c)
200 Channels
d)
115 Channels
3.
3.Co-channel reuse ratio is mathematically represented by ______(CO2)(B3)
a)
Q=D*R
b)
Q=D/R
c)
Q=D^R
d)
Q=1/R
4.
4.The ability of user to access a trunked system during the busiest hour is to be measured in a communication system, Which among the following parameter is used to the measure it?(CO2)(B3)
a)
Trunking
b)
Grade of Service
c)
Multiplexing
d)
Sectoring
5.
5.Identify among the following a suitable circumstance, for a handoff to happen.(CO2)(B4)
a)
A call initated in one cell and the mobile user moves into a different cell while the call is in progress and the received signal strength from base station decreases below a threshold value.
b)
A call initated in one cell and the mobile user remains present in the samecell and the received signal strength from base station decreases below a threshold value.
c)
A mobile registered to a Base station moves to another base station as a visitor and initiates a call.
d)
A mobile remains in the same cell and is idle
6.
6.QPSK provides twice the bandwidth efficiency and _______ energy efficiency as compared to BPSK.(CO3)(B4)
a)
Twice
b)
Half
c)
Same
d)
Four times
7.
7.Which of the following is not a detection technique used for detection of π/4 QPSK signals?(CO3)(B4)
a)
Baseband differential detection
b)
IF differential detection
c)
FM discriminator detection
d)
Envelope detection
8.
8.Which among the following is not a property of MSK?(CO3)(B4)
a)
Variable envelope
b)
Spectral efficiency
c)
Good BER performance
d)
Self synchronizing capability
9.
9.Which of the following is the most significant characteristic for GMSK modulation?(CO3)(B4)
a)
Minimum ISI
b)
Minimum error rate
c)
Better spectral efficiency than PSK and its variants
d)
Variable envelope property and discontinuous phases at envelope
10.
10.With respect to linear modulation schemes,As the value of M _________ the bandwidth efficiency ________(CO3)(B4)
a)
Increases, same.
b)
Increases, decreases
c)
Increases, increases
d)
Decreases, same
11.
11.Why is a cyclic prefix required in an OFDMA?(CO3)(B4)
a)
To ensure symbol time is an integer number
b)
To help overcome multipath and ISI
c)
To maintain good BER
d)
To make OFDMA scalable
12.
12.Which among the following processing steps combine multiple OFDM subcarriers into a single signal for transmission?(CO3)(B4)
a)
Serial to Parallel conversion
b)
FFT
c)
IFFT
d)
Channel Mapping
13.
13. _______________ property of OFDMA system allows adjacent subcarriers to be used without interference.(CO3)(B4)
a)
Originality
b)
Octagonality
c)
Orthodoxy
d)
Orthogonality
14.
14.Which among the following replaces the static sine pulses of OFDM to improve flexibility?(CO3)(B4)
a)
Wavelet bases
b)
Triangular pulses
c)
Impulse bases
d)
Ramp pulses
15.
15.Among the following, one of the options is not a disadvantage of OFDM. Identify that.(CO3)(B4)
a)
Complex and intensive IFFT computation
b)
Sensitive to frequency offset
c)
High peak to average power ratio
d)
Reduced Datarate
100 %
