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How to investigate channel reciprocity in OFDM

I'm trying to verificate channel reciprocity in attached OFDM example files.

But there are so many strange things... 

First, channel is not same when swithch the names of Tx part and Rx part.

Second, When running the vi at first, in excel file there is no data. after second running, there is data in excel file. why?

Third, I expect iteration of for loop is 5 but this example run for only 4 iterations... why?


Can anyone help me please? ...


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