Howtosignalprocessing
What is OQPSK?
Offset quadrature phase-shift keying (OQPSK) is a variant of phase-shift keying modulation using four different values of the phase to transmit. It is sometimes called staggered quadrature phase-shift keying (SQPSK).
Why OQPSK is preferred over QPSK?
In systems employing power amplifiers with non-linear characteristics, offset quaternary phase-shift keying (OQPSK) is preferred over conventional QPSK due to its reduced degree of instantaneous phase transitions.
What is a disadvantage of OQPSK?
A disadvantage of OQPSK is that it introduces a delay of half a symbol into the demodulation process. In other words, using OQPSK increases the temporal efficiency of normal QPSK. The reason is that the in phase and quadrature phase components of the OQPSK cannot be simultaneously zero.
Where is OQPSK used?
The OQPSK modulation scheme is commonly used in high-speed wireless data transmission systems, especially terrestrial mobile communication systems, wideband satellite communication systems, digital video broadcasting systems, and various other systems 8-10.
