Long Trellis Diagram

• Definition:
  The number of trellis sections displayed varies depending on the Decode Style and the Block/Trace Length, both parameters that you can edit in the Setup Panel. The long trellis diagram is meant to show the progressive status of the algorithm, as well as to show the final path through the trellis that the Viterbi algorithm chooses. The states are drawn from top to bottom starting at state zero.
  
• Usage:
  You can shift around in the trellis by clicking in this diagram on the trellis section that you want to view in detail. You can also shift a block at a time to the left or right by clicking to the left or right of the trellis.
  
• Examples:
  You can see in the picture of the long trellis diagram above the progression of a trace back operation. The trace path is denoted by the green lines. The blue lines are the other surviving branches and parts of the trace path that have yet to be traced back through.