Hi , I have a two known signal with some frequency offset between them , without time delay difference , i can conjugate-multiply two signals and get a tone proportional to offset value (pls find attached picture for flow-graph i used ) . I think i need some sort of PLL and NCO to correct frequency offset and lock to known signal . As i know , it's impossible in gnu radio flow graph to make closed loop systems , but how i can implement that in one block ? are there any example block that implemented some thing like that ?
Thank you .
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