Hi to all, I resolved my problem and I want to share the solution The problem was the amplitude in the QAM demod block input. I checked the constellation in the transmitter directly before UHD usrp block for being sure the the constellation points are good depending on the samples/symbol value (8 worked good). After that i just try to adapte the amplitude signal in reception by adding gain for to have the same signal which i had in my QAM simulation. Like that the transmission worked good. Zakaria
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