IPIQ

ELECTRICITY

H04

ELECTRIC COMMUNICATION TECHNIQUE

H04L

TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

27/00

Modulated-carrier systems

H04L27/18

Phase-modulated carrier systems, i.e. using phase-shift keying

H04L27/20

Modulator circuits; Transmitter circuits

H04L27/2032

for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner

H04L27/2053

using more than one carrier, e.g. carriers with different phases

H04L27/206

using a pair of orthogonal carriers, e.g. quadrature carriers

H04L27/2067

with more than two phase states