Apparatus for tracing-back survivor path of trellis code data and tracing-back method of the same

摘要

The present invention relates to a traceback unit for use in a Viterbi decoder, in particular to respond actively to external factors such as the deterioration of the channel, and the survival path traceback of a suitable lattice code data to reduce the processing time unit, and that that for providing a back-trace method, the present invention to this end, the lattice code in the survivor path traceback unit of data, and stores information on the survivor path, an inverse of the survivor paths during a threshold time predetermined by the information parts store and track to track; Detector for detecting the survivor paths to converge in response to the store and track the tracking result portion; And provide to variable the critical time threshold time survivor path traceback of the lattice code data device comprising a controller for setting the optimal threshold time when the back-trace of a survivor path based on whether the convergence.; The present invention according to the survival path traceback method of the lattice code data, comprising: group backtrack a Survivor paths for the critical time set; Detecting the survivor paths to converge according to the results of the tracking station; And it provides the predetermined critical period of time by varying the survivor path traceback method of the lattice code data comprises to have the optimal threshold time in the traceback step, depending on whether the convergence.