Difference between qpsk and offset qpsk

1. What is the difference between QPSK and offset QPSK?
2. What is the advantage of offset QPSK QPSK compared to conventional QPSK?
3. What is offset in QPSK?
4. What are the types of QPSK?

What is the difference between QPSK and offset QPSK?

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.

What is the advantage of offset QPSK QPSK compared to conventional QPSK?

Compared to the conventional QPSK, the main difference of OQPSK is that its Q-channel digits lag behind the I-channel digits by one half symbol. Thus, OQPSK avoids the 180/spl deg/ phase transitions and therefore has the better power spectrum.

What is offset in QPSK?

Offset QPSK, which involves adding a delay to one of two digital data streams used in the modulation process, reduces the maximum phase jump to 90°. Another option is π/4-QPSK, which reduces the maximum phase jump to 135°.

What are the types of QPSK?

OQPSK and pi/4 QPSK are variants of the basic QPSK modulation schemes. They are widely used based on their unique individual phase transition functionalities compare to one another. This page explain these modulation types and explain difference between QPSK vs OQPSK vs pi/4QPSK.