The term OFDM symbol in Wireless Communication / Radio frequency in LTE explanation?
Hi guys, I've already read and understand what does OFDM mean and what does it stand for and why we use it in our wireless technology today.
My question that I didn't understand is what does it mean number of "OFDM symbol per frame is 1 or two or 3 ..whatever"?
to clear more, lets assume I have pattern of data to transmit : [0 1 0] , and at each frame number of OFDM symbols is 2.
so what does it mean? is it mean the following claim on the data:
the data [0 1 0] will be stored in three frames and at each frame there's two OFDM symbols? so for is instance
0 is stored in frame and it has two OFDM symbols
1 is stored in frame and it has two OFDM symbols
0 is stored in frame and it has two OFDM symbols
So if that's true , what does it mean that 0 have two OFDM symbols? I need to understand what does it mean that certain frame has N OFDM symbols.
Appreciated for any help.
1 Answer
Orthogonal Frequency Division Multiplexing is used where there are more than (4) constellations (one per quadrant) and are orthogonal to each other (one step).
"Conceptually, OFDM is a specialized frequency-division multiplexing (FDM) method, with the additional constraint that all subcarrier signals within a communication channel are orthogonal to one another. "
https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing
The two symbols are constellation position (phase) in time and frequency.
see slide 8 :
https://www.slideshare.net/ALWINPOULOSE/ofdm-81262876
