Monolith149 Daily

Another place to see what KG is doing...


We noticed the other day how QAM (quadrature amplitude modulation) bit rates, e.g., in optical fibre, increase by 4x at each step: QAM16, QAM64, QAM256. The Wikipedia page makes why this is completely clear. In the digital version of QAM there’s an NxN matrix, a “constellation” of points when viewed as an amplitude and phase angle. Scroll down to “Quantized QAM” on the page to see the animated GIF on the right.

Quadrature amplitude modulation