Howtosignalprocessing
- What is quadrature sampling?
- What is quadrature data?
- What does quadrature mean in electronics?
- What is an IQ plot?
What is quadrature sampling?
Quadrature-sampling is the process of digitizing a continuous (analog) bandpass signal and translating its spectrum to be centered at zero Hz. Let's see how this popular process works by thinking of a continuous bandpass signal, of bandwidth B, centered about a carrier frequency of fc Hz.
What is quadrature data?
Quadrature signals, also called IQ signals, IQ data or IQ samples, are often used in RF applications. They form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis.
What does quadrature mean in electronics?
In-Phase and Quadrature
In any event, “in-phase” and “quadrature” refer to two sinusoids that have the same frequency and are 90° out of phase. By convention, the I signal is a cosine waveform, and the Q signal is a sine waveform.
What is an IQ plot?
Plotting IQ means putting I on the X axis of a graph and Q on the Y axis. When I=1, Q=0. That's a spot right on the X axis at X=1. The same thing happens, but flipped around when I=-1. It also happens when I=0 and Q=1, but rotated 90 degrees.
