Howtosignalprocessing
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).
What is difference between QPSK and OQPSK?
Offset Quadrature Phase Shift Keying (OQPSK) is a variant of the QPSK modulation scheme where the phase or timing of either the in-phase or Quadrature component is shifted relative to each other by a one bit-period or half a symbol-period Ts as compared to QPSK.
How does OQPSK work?
Description. The OQPSK Modulator Baseband block modulates the input signal using the offset quadrature phase shift keying (OQPSK) method and applies pulse shape filtering to the waveform. For more information, see Pulse Shaping Filter. The output is a baseband representation of the modulated signal.
Why use OQPSK?
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. Hence, the range of the fluctuations in the signal is smaller.
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.
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