Implementation of fixed-delay soft-output algorithms

Author

Tsai, Shiauhe ; Chen, Tsao-Tsen ; Lehnert, James S.

Author_Institution

Purdue Univ., West Lafayette, IN, USA

Volume

3

fYear

1998

fDate

18-21 Oct 1998

Firstpage

993

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 1998. MILCOM 98. Proceedings., IEEE

Conference_Location

Boston, MA

Print_ISBN

0-7803-4506-1

Type

conf

DOI

10.1109/MILCOM.1998.726997

Filename

726997