Re: [Discuss-gnuradio] How to use IQ Bal Optimize/Fix?

[kokosz]

This is exactly what I am doing, but restored signal looks very weird (its real part is close to zero). I have attached example *grc file showing the problem.

Dnia 31 stycznia 2018 12:34 Jeff Long <address@hidden> napisał(a):

If you put 0 in the manual fields and wire

 src->optimize->iqbal

and

 src->iqbal

it seems to work fine. Do you have a GRC file?

"period" is some sort of time constant, in samples. If you set it to

samp_rate, optimization will happen within a second. Smaller values for

faster response up to a point.

On 01/31/2018 05:54 AM, kokosz wrote:

Dear all,

It looks like IQ imbalance is causing problems in my application, as I

was able to simulate real-world-like problems after adding "IQ Imbalance

Generator" to my GRC flowgraph. So, after simulating this imbalance, I

wanted to get rid of it with the help of "IQ Bal Optimize" and "IQ Bal

Fix" combo. Unfortunately, I can't get it work.

As far as I understand, "IQ Bal Optimize" is automatically detecting

settings (i.e. magnitude and phase correction values) for "IQ Bal Fix"

and pass it to the latter block via message connection called

"iqbal_corr". Is this is true, I don't understand why I have to manually

set "Magnitude" and "Phase" in "IQ Bal Fix" (otherwise I cannot run the

flowgraph because of empty fields). I think that these fields were meant

for making manual fix possible, but when using "IQ Bal Optimize"/"IQ Bal

Fix" combo, message connection should be all what is necessary, right?

Also, because of lack of detailed documentation, I am not sure how to

interpret "Period" field in IQ Bal Optimize - what units are expected here?

I am using GRC v3.7.11, compiled from source files few days ago.

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iqbal_test.grc
Description: application/gnuradio-grc