Fundamental Flashcards
What is Carrier Signal ?
A waveform that is modulated with an information bearing signal for the purpose of Conveying Information.
Data is sent as a series of 1’s and 0’s. The transmitter needs a way of sending both 0’s and 1’s to transmit data from one location to another.
What is frequency ?
The number of waves generated over 1-second period of time
What is Amplitude ?
Height of the Wave
What is Phase ?
Relationship between two Waves with same frequency
What is Wavelength?
The distance between two Successive crests and troughs of a Wave
What is Keying Method ?
Changing a signal into a carrier signal. It provides the signal with the ability to encode data so that it can be communicated or transported.
What is Current State ?
If a 1/0 is being transmitted is to notice the state of the signal at an expected point in time.
What is State Transition?
Determine a 1/0 based on whether or not the
transmitted signal changed state, such as going out of phase
What is Amplitude Shift Keying (ASK) ?
Variation in Amplitude.
Used in Optic Cable
What is Frequency Shift Keying (FSK) ?
Discrete frequency Changes in Carrier signal.
Where is FSK used ?
Used in low frequency Transmission Band
Where is ASK used ?
Used in Optic Cable
What is Phase shift Keying (PSK) ?
Changing the Phase of frequency in Carrier Wave.
It is Accomplished by varying Sin and Cos
Where is PSK used ?
Used in Wireless LAN, RFIR, Bluetooth
What is Multiple Phase Shift Keying ?
Advanced versions of PSK can encode multiple bits per symbol. Instead of using 2 phases for a single 1/0, we can use four phases, which is
capable of representing two binary values (00, 01, 10, or 11).
