What is IQ (in-phase/quadrature)?

The expression “I/Q” is a contraction for “in-phase” and “quadrature.”I/Q signals are consistently amplitude-modulated, not recurrence or phase-modulated. A sinusoid with angle modulation can be disintegrated into two amplitude-modulated sinusoids that are offset in phase by one-quarter cycle. IQ data samples are frequently utilized in RF applications. They structure the basis of complex RF signal modulation and demodulation, both in hardware and in software, and in complex signal analysis.