PSK MODULATION
PSK MODULATIONBy NiharikaChandanaSai chaitanya
What is Modulation ?
Modulationis the process of varying one or more properties of a
periodic waveform, called the carrier signal (high frequency
signal), with amodulatingsignal that typically contains information
to be transmitted..OR
In other words modulation is the process of changing the
characteristic properties of carrier signal like amplitude,
frequency and phase
Example AM ( amplitude modulation )
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MODULATIONDIGITALANALOGIn analog modulation the signal that we
transmit is continous in nature.
In digital modulation the signal that we transmit is digital in
nature.
TYPES OF DIGITAL MODULATION
DIGITAL MODULATIONBASEBANDBANDPASSDMPWMPPMPCMPAMASKFSKPSKPSK (
phase shift keying )
PSK is a frequency modulation scheme in which digital
information is transmitted through discrete phase changes of a
carrier wave
Phase of the carrier is varied to represent digital data (binary
0 or 1)
Amplitude and frequency remains constant.
If phase 0 deg to represent 0, 180 deg to represent 1.
PSK can be BPSK, QPSK, 8-PSK, 16-PSK depending upon number of
bits.
Constellation diagram for BPSK
Constellation diagram for 4-PSK
Constellation diagram for 8-PSK
PSK generation using operational amplifier
PSK APPLICATIONS
RFID based devices
Wireless Lan
Bluetooth 2.0Thank You!12Chart1
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