[Discuss-gnuradio] problem of frame synchronization

[Irfan Ullah]

Hi all,

I am designing a QPSK transceiver using chunks to symbols and constellation decoder I have done the timing synchronization and carrier phase synchronization at receiver but I have some delay in my received data means at the start I have some garbage values 

and then original data is started so I want to remove this delay please help me how can I remove this delay I have searched to find some grc blocks for frame synchronization but I have not succeeded.

I have worked on many blocks like simple for frame synchronization 

1) framer and simple correlator          

2) GLFSR source and PN correlator 

3) Header/payload demux and stream to taged stream block 

4) packet encoder and decoder 

but I cannot used these successfully reasons are because I have no much experience in GNU Radio or may be these blocks are not 

designed for frame synchronization and frame delays

 GRC pictures are attached of my trancseiver and header payload demux method of frame synchronization

any help will be nuch appreciated 

best regards,

Irfan Ullah

received_text_file.txt
Description: Text document

original_Tranceiver.png
Description: PNG image

original_data.txt
Description: Text document