Cyclic Autocorrelation Function (CAF): How BPSK and QPSK Differ in Cyclostationary Analysis
The Cyclic Autocorrelation Function (CAF) reveals hidden periodic structure in modulated signals. This article explains what the CAF is, how to compute it, and why BPSK and QPSK produce fundamentally different CAF signatures — a difference that cannot be seen in a standard power spectrum.