Phase-Shift Keying - "PSK is can be a state transition technique, where the change of phase can represent a 0 bit and the lack of a phase change can represent a 1 bit, or vice versa."
Should it be, "PSK is a state...." or, "PSK can be a state....." or, "PSK is/can be a state..."
everything points to "PSK is a state..." But I'm not an expert and I doubt it's a big deal but I figured I'd throw it in.
Thanks for reaching out James! I'll forward your inquiry to the editorial department.
Tom with Wiley