Lorem ipsum dolor sit amet, consectetur adipiscing elit. In this tutorial you build the smallest interesting communications link — a bit source, a modulator, an additive-noise channel, and a constellation sink — then watch what noise does to the symbols.
Step 1 — drop the blocks
Nullam quis risus eget urna mollis ornare vel eu leo. Drag a Bit Source onto the canvas, then a Modulator, an AWGN Channel, and a Constellation sink. Wire them left to right.
Step 2 — sweep the SNR
Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. As you lower the SNR, the four clusters bloom outward; the error-vector magnitude readout climbs to match.
EVM (%) ≈ 100 · 10^(−SNR/20) for an unfiltered AWGN link.
Step 3 — read it
Vestibulum id ligula porta felis euismod semper. Once the clusters start to overlap, symbol decisions cross the axis and the bit-error rate takes off. Try the live lab below.