Huang, "Reconfigurable all-optical logic gates for multi-input differential phase-shift keying
signals: design and experiments," Journal of Lightwave Technology, vol.
The recent bandwidth explosion is pushing next-generation transmission systems to new capacity limits requiring the use of complex high-order modulation formats like dual-polarization quadrature phase-shift keying
[6.] Chris Xu, Xiang Liu, Xing Wei Differential Phase-Shift Keying
for High Spectral Efficiency Optical Transmissions// IEEE Journal of Selected Topics in Quantum Electronics, 2004.--Vol.
The ST400QF series airborne synthesized patented FEHLER quadrature phase-shift keying
(QPSK) telemetry transmitter doubles the information bandwidth (when compared to conventional PCM-FM) while utilizing class C power amplifiers, which maintain the power efficiency associated with standard FM transmitters.
This article offers closed-form expressions for FOBP for classical binary phase-shift keying
(BPSK), quadrature phase-shift keying
(QPSK) (including offset QPSK (OQPSK)) and minimum-shift keying (MSK) modulation.
The later presentation of the quadrature phase-shift keying
(QPSK) modulator output signal implies that any complex modulation can be generated using properly chosen amplitudes and phases of the I and Q signals.
A solid-state high power amplifier (HPA) amplifies an offset quadrature phase-shift keying
signal on the uplink, and a traveling-wave-tube amplifier (TWTA) provides the gain for the downlink.
Using a conservative quadrature phase-shift keying
modulation scheme, roughly 1 Gbps of digital data can be transmitted within 1 GHz of wireless spectrum.
Depending on the applications, various modulation schemes are being implemented from quadrature phase-shift keying
(QPSK) to 64 quadrature amplitude modulation (QAM).
The industry continues to embrace linear modulation techniques such as quadrature phase-shift keying
(QPSK), 64-state QAM (64QAM) and multicarrier configurations.
Complex modulation formats such as binary phase-shift keying
, quadrature phase-shift keying
and 64 quadrature amplitude modulation required for testing RF digital communications systems may be accomplished by driving the I/Q inputs with analog signals.
Simple modulators for schemes such as amplitude-shift keying (ASK), binary phase-shift keying
(BPSK) and frequency-shift keying (FSK) can be designed using a wide range of techniques.