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WorksheetsModule 3-Digital modulation techniques
Total questions: 20
Worksheet time: 10mins
In Binary Phase Shift Keying system, the binary symbols 1 and 0 are represented by carrier with phase shift of
Π/2
Π
2Π
0
BPSK system modulates at the rate of
1 bit/ symbol
2 bit/ symbol
4 bit/ symbol
None of the above
The binary waveform used to generate BPSK signal is encoded in
Bipolar NRZ format
Manchester coding
Differential coding
None of the above
The bandwidth of BFSK is ______________ than BPSK.
Lower
Same
Higher
Not predictable
The maximum bandwidth is occupied by
ASK
BPSK
FSK
None of the above
BPSK uses non-coherent demodulator. State whether True or False.
True
False
Probability density function defines
Amplitudes of random noise
Density of signal
Probability of error
All of the above
In coherent detection of signals
Local carrier is generated
Carrier of frequency and phase as same as transmitted carrier is generated
The carrier is in synchronization with modulated carrier
All of the above
In DPSK technique, the technique used to encode bits is
AMI
Differential code
Uni polar RZ format
Manchester format
QPSK system uses a phase shift of
Π
Π/2
Π/4
2Π
QPSK is a modulation scheme where each symbol consists of
4 bits
2 bits
1 bits
M number of bits, depending upon the requirement
In On-Off keying, the carrier signal is transmitted with signal value '1' and '0' indicates
No carrier
Half the carrier amplitude
Amplitude of modulating signal
None of the above
In non coherent reception _____ is measured.
Phase
Energy
Power
None of the mentioned
QAM uses ______ as the dimensions.
In phase
Quadrature
In phase & Quadrature
None of the mentioned
Which system uses QAM?
Digital microwave relay
Dial up modem
Digital microwave relay & Dial up modem
None of the mentioned
DPSK uses coherent form of PSK. State whether True or False.
True
False
On a 16-QAM constellation diagram each constellation point represents a
dibit
quadbit
tribit
pentabit
In-------the phase and amplitude of the carrier signal is varied in accordance with the information signal
ASK
FSK
PSK
QAM
In which system, bit stream is portioned into even and odd stream?
BPSK
MSK
QPSK
FSK
Energy per symbol Es is given as
Es=Eb(log2M)
Es=Eb/(log2M)
Es=2Eb(log2M)
Es=Eb/2(log2M)
