9 min read
EVM: why a clean spectrum can still fail at 64-QAM
A pattern I keep seeing on the bench goes like this. A prototype modem shows a clean spectrum, the signal sits well above the thermal noise floor, and the link budget says there is …
3 pages
Snr
7 min read
Nyquist is not Shannon: why more samples does not mean more information
Digital engineers are trained to treat “more” as a default win: higher clock rates, wider bandwidths, deeper bit depths. Applied to analog-to-digital conversion, the …
6 min read
SNR: the number that decides whether a signal survives
Every communication system starts with the same goal: move a signal from one place to another and recover its meaning at the far end. In practice the signal passes through copper, …