[Discuss-gnuradio] transmit file with qpsk on e310

hello all

i want to transmit a file with the way of  QPSK

this is my send grc

file source----repack bits-----chunks to symbol-----multile const------uhd_ink

this is my receive grc

uhd_source-----constellation decoder-----repack bits-----file sink

next is the "qt gui constellation sink" of the oupotput of 

chunks to symbol in the send

next is the output of UHD_source in recieve "qt frequence sink""qt gui constellation sink"

in this picture ,i think the recieve got the signal,but i do not know the constellation mean,

next is the set of my uhd_source and uhd_sink

source

sink

​
​my problem is that my recieve file is completely different with the source file

i use simulation way (no uhd),the recieve is same as source,

so i think there is some block needed between the constellation coder and uhd_source,for example the sync block

hope someone knows how to solve this sync problem or how to transmit a file with QPSK on e310 with the  antenna

thank you 

---Ekko​