OFDM with 4-QAM Simulation

OFDM 4-QAM: Step-by-Step Multiplexing

Visualizing Frequency-to-Time transformations

Subcarriers (N) (Choose 2, 4, 8, 16, etc)

CP Length

SNR (dB)

Step 1: Serial-to-Parallel Bits

Generating two parallel streams (In-phase and Quadrature).

Step 2: 4-QAM Mapping

$$X_k = \frac{1}{\sqrt{2}}(A_{I} + jA_{Q})$$

Step 3: Multiplexing (IFFT)

Converting frequency subcarriers into a time-domain wave.

$$x[n] = \text{IFFT}\{X_k\}$$

Step 4: Guard Interval (Cyclic Prefix)

Prepending the last $N_{cp}$ samples to the front to prevent ISI.

Step 5: Receiver Demultiplexing (FFT)

Removing CP, adding noise, and transforming back to frequency.

Return to Online Simulations Main Page →

OFDM Main Page →