| 摘要 |
<p>An improved all-path traceback/forward trace (APTFT) system for use in managing the memory used in processing decoded survivor sequences produced by a trellis decoder network. The memory size is decreased to T * N, where T is a predetermined survivor memory depth and N is the number of states in the trellis. The latency value of the present system is equal to T. Both the memory requirement and latency value represent a 33% decrease in the value of similar parameters produced in a prior art APTFT system. An existing forward trace/path selection unit is modified to take advantage of the inherent nature of the forward trace process (7) in order to simplify the decoding system (9). A generalized version of the APTFT system permits greater flexibility in the choice of memory size and latency values needed to satisfy the requirements of a particular decoding system.</p> |
