AM
message signal consists of information. it is a low frequency signal
Explain FM
frequency of the carrier signal is varied according to the message signal
which one is used to generate PM signal
differentiator is used
what is ASK
Amplitude shift keying
psk types
BPSK
DPSK
QPSK
define bandwidth
differences between frequencies
what is modulation index
ratio of message signal amplitude to carrier signal amplitude
AM efficiency
33%
ASK Bandwidth
bit rate doubled
PSK Bandwidth
Rb
advanges
simple
flexible communication
fm frequency range
88-108 MHz
write different phase shifts
0,90,180,360
in ASK which is variable parameter
Amplitude
differentiate PSK and DPSK
exoR and encoding athen get DPSK signal
Applications
Short range communications
applications
FM radio
what is error
if phase not shifted
what is communication
between two points
differentiate analog /Digital
analog is continous
digital means binary data
define digital communication
digital data is our input
fm types
NBFM
WBFM
noise
internal and external noise
demodulation types
coherent and non coherent
DPSK
exor operation