In-phase

OFDM How to do the carrier recovery of the quadrature(I/Q) demodulation

OFDM How to do the carrier recovery of the quadrature(I/Q) demodulation
  1. What is I and Q in signals?
  2. How does IQ modulation work?

What is I and Q in signals?

By convention, the cosine wave is in-phase component and the sine wave is the quadrature component. The capital letter I represents the amplitude of the in-phase signal, and the capital letter Q represents the amplitude of the quadrature signal.

How does IQ modulation work?

An IQ modulator is a device that converts baseband information into RF signals. Internally, two double-balanced mixers are combined as shown below. By modulating with both in-phase (I) and quadrature (Q) inputs, any arbitrary output amplitude and phase can be selected.

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