Terminating trellis in recursive systematic convolutional code for data security applications

摘要

The method involves generating a termination sequence depending on the state of a memory after encoding an information sequence in a coder. The termination sequence is fed to the coder input and the coder memory brought to a defined desired state. The termination sequence and the actually generated control bits can be transferred. The desired state of the coder memory can be set to coincide with its initial state at the start of encoding of the information sequence. The initial state of the coder memory can be set to "log.null" or "log.one" for all memory locations. Each subsequent bit of the termination sequence to be fed to the coder is derived from the coder memory states.