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When this tutorial is complete, we will be able to build this flow graph:
 
When this tutorial is complete, we will be able to build this flow graph:
  
[[File:Tutorial4_fg.png]]
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https://raw.githubusercontent.com/gnuradio/gr-tutorial/master/examples/tutorial4/figs/Tut4_My_QPSK_demod_flowgraph.png
  
 
The flowgraph demonstrates a QPSK transceiver chain with the block '''My QPSK Demodulator''' block module under the OOT '''tutorial'''. We will be building this block using C++. All other blocks are standard GNU Radio blocks.
 
The flowgraph demonstrates a QPSK transceiver chain with the block '''My QPSK Demodulator''' block module under the OOT '''tutorial'''. We will be building this block using C++. All other blocks are standard GNU Radio blocks.
  
'''My QPSK Demodulator''' consumes QPSK symbols which are complex values at the input and produces the alphabets as bytes at output. The output screen looks like this:
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As in the previous tutorial, '''My QPSK Demodulator''' consumes QPSK symbols which are complex valued floats at the input and produces the alphabets as bytes at output. We will plot the binary values (from 0 through 3) as well as the transmitted complex symbols during operation.
 
 
[[File:Tutorial4_out.png|700px]]
 
  
 
== Step 1: Create an OOT module <code>gr-tutorial</code> ==
 
== Step 1: Create an OOT module <code>gr-tutorial</code> ==

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