How is OFDM used to modulate the data?
How is OFDM used to modulate the data?
OFDM uses multiple carriers to modulate the data N carriers B Modulation technique A user utilizes all carriers to transmit its data as coded quantity at each frequency carrier, which can be quadrature-amplitude modulated (QAM).
How is orthogonal frequency division modulation ( OFDM ) used?
Orthogonal Frequency Division Multiplexing (OFDM) Modulation- a mapping of the information on changes in the carrier phase, frequency or amplitude or combination. Multiplexing- method of sharing a bandwidth with other independent data channels. OFDM is a combination of modulation and multiplexing.
How many periods are there in an OFDM signal?
Symbol: 8 periods of f 0 Symbol: 4 periods of f 0 Symbol: 2 periods of f 0 Receive time B Decode each frequency bin separately Channel frequency response f f Time-domain signal Frequency-domain signal OFDM uses multiple carriers to modulate the data N carriers B Modulation technique
What is the difference between OFDM and multiplexing?
Multiplexing- method of sharing a bandwidth with other independent data channels. OFDM is a combination of modulation and multiplexing. Multiplexing generally refers to independent signals, those produced by different sources. So it is a question of how to share the spectrum with these users.
Which is a special case of FDM in OFDM?
This is a special case of FDM, which is called OFDM (as implied by the word – ‘orthogonal’ in OFDM) Consider that we want to send the following data bits using OFDM : D = {d0,d1,d2,…).
What is the basic concept of OFDM transmission?
The following figure illustrates the basic concept of OFDM transmission (note: In order to give a simple explanation to illustrate the underlying concept,the usual IFFT/FFT blocks that are used in actual OFDM system, are not used in the block diagram) .