V-BLAST SIC (MIMO) Online Simulator

V-BLAST SIC (MIMO) Simulator

Signal-to-Noise Ratio (SNR dB) 20 dB

Spatial Interference (Channel Cross-Talk) Medium Coupling

Stream 1 (Antenna A)

1011

Stream 2 (Antenna B)

0110

MIMO Receiver Processing: Mixed Signal vs. Successive Cancellation

Simulation Workflow

1. Spatial Multiplexing: Two independent bitstreams (Blue and Yellow) are transmitted simultaneously on the same frequency using two antennas.

2. Channel Mixing: Due to the nature of MIMO, the receiver's antenna sees a Linear Combination of both streams. This is the messy white wave in the center graph.

3. Successive Interference Cancellation (SIC):

• The receiver first decodes Stream 1 (treating Stream 2 as noise).
• Once Stream 1 is known, the receiver subtracts its waveform from the mixture.
• The remaining signal is now "Clean," allowing Stream 2 to be decoded with zero interference.

Mathematical Framework

The received signal vector y is represented by the channel matrix H and the transmit vector x:

y = Hx + n

For SIC, the detection of the second stream x₂ occurs after removing the estimated first stream x̂₁:

y_cleaned = y - h₁x̂₁

If the SNR is too low, an error in the first stage (Blue) will "propagate" and destroy the second stage (Yellow). This is known as Error Propagation.