FDMA Frequency Division Multiple Access

Different users use different frequency bands

Real-World Applications

1G analog mobile phones, FM radio stations, satellite transponder bandwidth allocation. Each person gets a fixed frequency slot, no interference, but low resource utilization.

Experiment Steps

Spectrum Allocation: Each user occupies a dedicated spectrum band

Simulation Experiment

Time Domain (X: Time, Y: Amplitude)

Spectrum Analysis (X: Frequency, Y: Amplitude)

FDMA Spectrum Slicing & Filtering Demo

FDMA Spectrum & Receiver Demo

Drag the slider to adjust receiver frequency, observe how the filter extracts specific user signals.

Users: 4

Total Bandwidth: 860 Hz

Frequency Domain View

Receiver Tuning:0 Hz

Demod Output

... NO SIGNAL ...
(Only background noise)

Principle:

Frequency Division: Different users are shifted to different center frequencies (200, 420...).
Guard Band: Prevents adjacent channel interference. If set too small, spectra will overlap.
Bandpass Filtering: Receiver extracts specific band via bandpass filter. Only when filter is aligned with user spectrum can a clear signal be demodulated.

Parameters(Real-time)

Num Users4

Channel BW200 Hz

Guard Band20 Hz

← Polar Code

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