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3.4.1.2. Node Synchronization
If you are not using external synchronization, you may not know the order of your N bits. The node synchronization option allows you to rotate the rr inputs until the decoder is in synchronization. To use node synchronization, you observe the BER and keep changing state_node_sync to rotate the rr inputs until you get the correct value for the BER.
Figure 15. Node Synchronization Block Diagram