Subscribe here to receive similar articles over e-mail whenever Krishna Pillai publishes an article on his site. The article compares various digital modulation schemes like BPSK, QPSK, PAM, 16PSK, ...

Information is carried by changing the phase of the carrier. ->BPSK (Binary PSK): Uses two phases (0° and 180°). Very robust, but only 1 bit per symbol. ->QPSK (Quadrature PSK): Uses four phases (0°, ...