Hi everyone,
Two days ago I asked something about boundary alignment, and I have been
trying many stuff in GRC to solve this. I am stuck on this for days and any
help will be appreciated. Below is a description of what I wish to do.
1) My transmission and receiving chain are like this: signal source ->
constellation modulator -> Adalm Pluto Tx-> Antenna -> Adalm Pluto Rx ->
Polyphase Clock Sync -> CMA equalizer -> Costas Loop -> decoding. As for
modulation scheme, I am using QPSK.
2) Now I just want to transmit one byte output from the signal source,
and following with one byte of a known pattern, and then one byte output from
the signal source, etc. Then at the receiver, because i already know the known
pattern, I need to sync to the known pattern in order to align the bytes, which
will allow me to hear clean audio at the receiver.
3) There are three things I am looking for:
a. I have been looking for a SIMPLE way to prepend a known pattern at
the transmitter, and send it with the output bytes of a signal source. Is
there any block that might work to do this in GRC?
b. I have been trying to see if i can write an embedded python block to
prepend a known pattern, but I am having a hard time trying to understand the
input_items of the block, and how i can add a known pattern iteratively.
c. If i can successfully send the known pattern with my data to the
receiver, is there any easy way to parse at the receiver?Thank you in advance! Lannan
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