Gpsk modulation

1. What is QPSK modulation technique?
2. What is Bfsk modulation?
3. What is Dqpsk modulation?
4. Why OQPSK is the preferred mode of modulation?

What is QPSK modulation technique?

Quadrature Phase Shift Keying (QPSK) is a form of Phase Shift Keying in which two bits are modulated at once, selecting one of four possible carrier phase shifts (0, 90, 180, or 270 degrees). QPSK allows the signal to carry twice as much information as ordinary PSK using the same bandwidth.

What is Bfsk modulation?

Binary FSK is a constant-envelope form of angle modulation similar to conventional frequency modulation except that the modulating signal varies between two discrete voltage levels (i.e., 1's and 0's) rather than with a continuously changing value, such as a sine wave.

What is Dqpsk modulation?

Differential Quadrature Phase Shift Keying. Differential Quadrature Phase Shift Keying is a modulation technique in which the carrier can assume one of four phases, each change of phase, or symbol, representing 2bits. The bit combinations being 00, 01, 11 and 10.

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.