modulation method where the carrier can assume 4 possible phase states, each 90 degrees apart.
uadrature hase- hift eying - A digital modulation technique used in modems and wireless networks, allowing the transmission of 2 bits per symbol. Provides a 2:1 compression ratio, resulting in double efficiency for the circuit being used.
The type of modulation DirecTV uses in their satellite transmissions.
Quadrative Phase Shift Keying.
Quaternary Phase Shift Keying
Quadrature Phase Shift Keying
Quadrate Phase Shift Keying
Quadrature Phase Shift Keyed - Modulation / demodulation system for digital satellite TV.
Quadruple phase shift keying. A modulation technique used by IEEE 802.11-compliant wireless LANs for transmission at 2 Mbps.
Quaternary Phase-Shift Key is a more elaborate form of PSK. Each pair of bits of the incoming sequence causes a change in the carrier phase between four possible states. The carrier undergoes four changes in phase (four symbols) and can thus represent 2 binary bits of data per symbol. Although this may seem insignificant initially, a modulation scheme has now been supposed that enables a carrier to transmit 2 bits of information instead of 1, thus effectively doubling the bandwidth of the carrier.
Quadrature Phase Shift Key, typical modulation scheme used in DVB satellite applications
Spectrally efficient modulation technique that breaks the information path into two parts called the "in phase" and the "quadrature phase" components. The combination of these two signals creates one of four unique symbols that are then used to modulate the phase of the carrier.
A single-carrier modulation scheme that supports 2 bits per symbol time. Equivalent to QAM 4.