### Steve Bian

Shared publicly -**On the Use of I/Q Signals**

All signals are complex, that is they have the form of \[x(t)=A\exp(i\omega t)\]. I/Q presentation of a signal fully captures this by storing the real component in the I , the in-phase signal, and the complex component in Q , the quadrature signal. When we ...

1

2 comments

The way I see it, the complex part encode phase information, and is always recorded, but is not part of any one sample, but rather is a relationship between samples, i.e. relative phase. I/Q sampling extracts the phase by multiplying the input by cos(w_s t) to construct I, and sin(w_s t) to construct Q, where w_s is the sampling frequency. By doing this, we recover the 3 pieces of information each sample carries: magnitude, time and phase, the latter we derive from the difference in I and Q.

Add a comment...