Creating an OOT block similar to Corr & Sync using Python

Hi All,

I am trying to implement a MIMO algorithm in a custom Python block
with vectors in & out. What i want to accomplish in this custom block is
to first correlate the input vectors with a given pilot matrix(e.g.
vector size 2), for example, the pilot length could be 1000, the
correlation will be a 2x2 matrix, then if the correlation satisfies some
condition, the block will output this 2x2 matrix. My questions are:

  1. Since the output depends on if a pilot signal is transmitted, we
    should use general block. But if I want this block to output all the
    correlations whether the condition is satisfied or not, then what type
    of block should i use? I am confused here because after the first 1000
    vectors are received, the block will produce 2 vectors for every input
    vector, so should i use an interpolation block?

  2. How do i use forecast and set_history functions in a Python block?
    Since I need 1000 input vectors for every 2 output vectors(if there are
    any), So the history should be set to 1000. I guess I can make it work
    without using these 2 functions by introducing a self.previous variable
    to store the last 999 input vectors, am I right?

  3. Are there any python block examples that might help me?

Thank you!

best,
Hai

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