Phase Shift Keying

/ˌpiː ɛs ˈkeɪ/

n. "Carrier phase modulation encoding bits via discrete phase states unlike GFSK frequency modulation."

Time Division Multiple Access

/ˌtiː diː ɛm ˈeɪ/

n. "Multiple access technique allocating time slots to users sharing single frequency channel unlike FDMA subcarriers."

TDD

/ˌtiː diː ˈdiː/

n. "Single-frequency duplexing alternating uplink/downlink time slots unlike FDD paired spectrum."