DIGITAL COMMUNICATION
1.
Define bit rate
Bit rate is defined as number of
bits transmitted during one second between the transmitter and receiver.
2.
Define baud rate.
Baud rate is defined as the rate of
change of signal on transmission medium after encoding and modulation have
occurred.
3.
Define bandwidth efficiency
Bandwidth efficiency is the ratio of
the transmission bit rate to the minimum bandwidth required for a particular
modulation
4.
Define Digital modulation
Digital Modulation is defined as
changing the amplitude of the carrier signal with respect to the binary
information or digital signal.
5.
What are the advantages of Digital communications
It has a better noise immunity
Repeaters can be used between
transmitters and receivers
It becomes simpler and cheaper as
compared to the analog communication
6.
What are the disadvantages of Digital communications
It requires a larger channel
bandwidth
Delta modulation needs synchronization
incase of synchronous modulation
7.
Define Amplitude Shift Keying (ASK).
Amplitude Shift Keying is defined as
changing the amplitude of the carrier signal with respect to the binary
information or digital signal.
8.
Define Phase Shift Keying (PSK).
Phase Shift Keying is defined as
changing the amplitude of the carrier signal with respect to the binary
information or digital signal.
9.
Define Minimum Shift Keying (MSK).
The minimum frequency space that
allows the 2 fsk representing symbols 0s and 1s. Thus CP (Continuous Phase) FSK
signal with a deviation ratio if one half is defined as MSK.
10.
Define Quadrature Amplitude modulation (QAM).
QAM is a form of digital modulation
similar to PSK except the digital information is contained in both the
amplitude and phase of the transmitted carrier.
11.
Define Frequency Shift Keying (FSK).
Frequency Shift Keying is defined as
changing the amplitude of the carrier signal with respect to the binary
information or digital signal.
12.
What are the advantages of MSK?
MSK baseband waveform are smoother
compared with QPSK MSK signals have continuous phase It does not have any
amplitude variation
13.
What are the advantages of QPSK?
Very good noise immunity
Effective utilization of available bandwidth
Low error probability
Very high bit rate data transmission
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