How to determine the initial sampling point from QAM eye diagram?

[leony]

From QAM eye diagram, how can I determine the initial sampling point?
And possible sampling values?
I have problems reading this eye diagram. Can anyone suggest me any sources helpful?

**broken link removed**

The eye diagram is here. I could not upload it to the forum.

Thank you....

 

[m_llaa]

qam eye diagram

Hi
If I understand your question correctly, From eye diagram, you cant determine initial sampling point and sampling values.
I saw your diagram, what do u want to read from it?
It is clear that your modulation is 16QAM, because your I channel have 4 level.
I think your SNR is also good, because your diagram is clean

 

[bulx]

qam eye-opening diagram

Agree. Thus, the best time to sample is in the middle, where the eye opening is maximum (middle of symbol period), and demodulated values would be ±0.5 or ±1.0 approx.

-b