Can OFDM modulate analog signal?

1. Is OFDM a modulation technique?
2. Which modulation types are used by OFDM technology?
3. What is the purpose of OFDM?
4. Why OFDM is called orthogonal?

Is OFDM a modulation technique?

Orthogonal frequency division multiplexing (OFDM) is a modulation technique that is used in several applications ranging from cellular systems (3GLTE, WiMAX), wireless local area networks (LANs), digital audio radio, underwater communications, and even optical light modulation.

Which modulation types are used by OFDM technology?

OFDM uses BPSK and QPSK modulation for the lower ODFM data rates. The higher OFDM data rates use 16-QAM, 64-QAM, and 256-QAM modulation. QAM modulation is a hybrid of phase and amplitude modulation.

What is the purpose of OFDM?

In OFDM, several bits can be sent in parallel, or at the same time, in separate substream channels. This enables each substream's data rate to be lower than would be required by a single stream of similar bandwidth. This makes the system less susceptible to interference and enables more efficient data bandwidth.

Why OFDM is called orthogonal?

In OFDM, the subcarrier frequencies are chosen so that the subcarriers are orthogonal to each other, meaning that crosstalk between the sub-channels is eliminated and inter-carrier guard bands are not required.