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Consult! What is the results of QPSK modulation over

Time:09-26

Bosses to see, I use the following code after QPSK modulation is a bunch of Numbers, is the plus or minus 1/square root of 2,
So I want to ask what the result after the QPSK modulation, where I was wrong, give advice or comments, thank you
Figure (2)
Data_temp1=reshape (ofdmsignal, 2, and []) ';
modulate_data=https://bbs.csdn.net/topics/pskmod (bi2de (data_temp1), 4, PI/4);
The scatterplot (modulate_data); Constellation %
grid on;
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