Title :
Implementation of fixed-delay soft-output algorithms
Author :
Tsai, Shiauhe ; Chen, Tsao-Tsen ; Lehnert, James S.
Author_Institution :
Purdue Univ., West Lafayette, IN, USA
Abstract :
A unified implementation of fixed-delay soft-output algorithms is considered in this paper. By minor modifications with lower numerical requirements, the optimum soft-output algorithm (OSA) and its suboptimal approximations can be integrated into a common algorithmic structure. Also, by applying the principle of the soft-output Viterbi algorithm (SOVA), the number of add-compare operations in the sub-optimal soft-output algorithm (SSA) can be further reduced with only small performance degradations. The performance degradations and the complexity reductions are illustrated by computer simulations
Keywords :
Viterbi decoding; computational complexity; concatenated codes; delays; digital communication; optimisation; add-compare operations; algorithmic structure; complexity reductions; computer simulations; concatenated systems; digital communication; fixed-delay soft-output algorithms; numerical requirements; optimum soft-output algorithm; performance degradations; soft-output Viterbi algorithm; sub-optimal soft-output algorithm; suboptimal approximations; unified implementation; Buildings; Computer simulation; Concatenated codes; Degradation; Delay; Digital communication; Mathematical model; Maximum likelihood decoding; Maximum likelihood detection; Viterbi algorithm;
Conference_Titel :
Military Communications Conference, 1998. MILCOM 98. Proceedings., IEEE
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-4506-1
DOI :
10.1109/MILCOM.1998.726997
