The Real Reason Behind Using I/Q Signals

#wireless #lockdownmath #communicationsystems #digitalsignalprocessing
Mystery behind I/Q signals is resolved in an easily understandable way.

[Shkvarka]

Thank you Sir!! Best regards from Ukraine, Odesa

[careygeorge]

Yes, this has been a mystery to me but your explanation is very helpful. Thanks!

[johnaweiss]

1:57 What do you mean, "frequency is a function of phase " ?

[LiveIbanez]

This is a wonderful explanation. Excellent job sir

[philkarn]

The #1 reason to use I/Q signals is that they let you to distinguish positive from negative frequencies. *Everything* else flows from that! Signals containing only a real component consist of equal amounts of positive and negative frequencies, so when you mix them you get both sum and difference frequencies. But mixing a complex signal with a complex oscillator simply adds the two frequencies; there is no difference frequency component! So despite the unfortunate term "complex", this actually vastly simplifies the processing and filtering of signals. Especially at low frequencies where it's easiest to process them digitally at low sample rates. Using real signals at low frequencies commonly causes "folding" around DC (O Hz), which is a real pain.

[stephan]

First time I really understood it! Great video.

[subirghoshal]

Beautiful explanation....pl make another video explaining through block diagram from IQ signal upto signal detection, final output

[shahnazfat]

Classic explanation. Still some doubts…
Gone through your lengthy post on iq modulation. Before introduction of iq modulation 8 psi modd demoed was explained and drawback of psi demodulation was explained in 8 psk.
If this is really the issue with psk how did it survived? I mean there is no one to one mapping of the constellation points at the receiver ….

[funfactory]

Where you repeated your sentence for I/Q explanation: By zero-phase sinusoids, do you mean "non-phase shifted sinuside"??

[zazugee]

is I/Q relevant for cell phone communication or PSK just bc of the circular polarization? i mean like most HF com is vertical or horizontaly volarized and thus I/Q isn't necessary?

[theoryandapplication]

thank you very much the video that i am looking for

[kkk-lwox]

Can't we find phase, by doing FFT on the main signal?

[sathishnayak]

The tutorial is simple to understand nice efforts. I have one basic doubt in IQ data . How the dynamic frequency signals represented with IQ data and IQ is basically zero IF signal if I am not wrong. If a certain signal is having negative doppler frequency then how the IQ data still hold the negative frequency information. Thank you

[NILpotent]

“Amplitude 1 by 5” and so on. What does that mean ??? These amplitudes are all less than 1.0 …