Introduction Flashcards
What are the components of any communication system?
Source, Transmitter, Channel, Receiver, End User
What is the purpose of a transmitter?
couple the message to the channel
Functions of the transmitter
amplification, modulation, and filtering
Channel mediums
free space, fibre, copper, or water
What is the purpose of the receiver?
To reverse the process of transmission
Functions of the receiver
demodulation, filtering
Reasons for modulation
easy radiation, reduce noise and interference, channel allocation, multiplexing
Which is better FM or AM radio?
FM, this is because frequency modulation is more robust for noise
Analog modulation technique categories
Amplitude modulation and angle modulation
Analog Amplitude Modulation Techniques
AM, DSB, SSB, VSB
Analog Angle Modulation Techniques
FM, PM
Digital Modulation Techniques
ASK, PSK, FSK, QAM, QPSK
AM
Amplitude Modulation
DSB
Double Side Band
SSB
Single Side Band
VSB
Vestigial Side Band
FM
Frequency Modulation
PM
Phase Modulation
ASK
Amplitude Shift Keying
PSK
Phase Shift Keying
FSK
Frequency Shift Keying
QAM
Quadrature Amplitude Modulation
QPSK
Quadrature Phase Shift Keying
QPSK is a combination of which two modulation techniques
PSK and QAM
Multiplexing Techniques
FDMA, TDMA, CDMA, WDMA
FDMA
Frequency Division Multiple Access
TDMA
Time Division Multiple Access
CDMA
Code Division Multiple Access
WDMA
Wave Division Multiple Access
Multiplexing
a way of sending multiple signals or streams of information over a communications link at the same time in the form of a single, complex signal.
