OFDM (Orthogonal frequency division multiplexing)
By DarthVader
Date: 2026-03-24
Topic: 256 see comments
Post views: 23
OFDM (Orthogonal frequency division multiplexing)
OFDM keeps radio signals separate when they coexist in the same geographical space.
In OFDM, the input data stream is divided among many closely spaced orthogonal subcarriers, with each subcarrier carrying a lower-rate sub-channel.
- The total data is split up
- Each part is sent on its own subcarrier
- Because each subcarrier runs at a lower symbol rate, the system becomes more resistant to intersymbol interference caused by multipath
- The subcarriers can overlap in frequency, but because they are orthogonal, they do not interfere with each other at the sampling instant
The key condition for orthogonality
The subcarrier spacing must satisfy:
Δf = \(\frac{1}{T_(us)}\)
Δf = (\frac{1}{T_(us)}\)
Where:
- Δf = spacing between subcarriers
- T = symbol duration
| Comments | Creator | Date | ID |
|---|
