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.
How does QPSK transmitter work?
The QPSK Modulator uses a bit-splitter, two multipliers with local oscillator, a 2-bit serial to parallel converter, and a summer circuit. ... are separated by the bits splitter and are multiplied with the same carrier to generate odd BPSK (called as PSKI) and even BPSK (called as PSKQ).
How a QPSK signal is generated?
One method of generating the QPSK waveform is by converting the input binary data stream into two streams: the odd- and the even bit streams consisting of the odd- and even numbered bits. Each of these binary streams can then be modulated using the BPSK, and then on adding we get the QPSK waveform.
