Howtosignalprocessing
- What is OQPSK modulation?
- Why OQPSK is the preferred mode of modulation?
- Why OQPSK is preferred over QPSK?
- What is a disadvantage of OQPSK?
What is OQPSK modulation?
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 OQPSK is the preferred mode of modulation?
In practice, the OQPSK modulation scheme is sometimes preferred as it contributes to lower amplitude fluctuations and distortions compared to a QPSK signal. The phase shift response of an OQPSK signal is shown below.
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.
