Title :
Improved linear-time metric sifting in breadth-first decoding of convolutional codes
Author_Institution :
Sharp Labs. of America Inc., Camas, WA, USA
fDate :
29 Jun-4 Jul 1997
Abstract :
We describe a linear-time method for finding the best metrics during breadth-first reduced search decoding of convolutional codes. This method is an improved version of one of the merge sifting methods described by Kot (1993). As an example, in the M-algorithm decoding of rate 1/2 convolutional codes, the present method reduces the number of comparisons used to provide a sorted set of survivor metrics from 3M-1 to 2M+1. This is a significant improvement over comparison-based sorting, which requires O(M log M) comparisons, and offers a similar improvement over well-known comparison-based selection methods
Keywords :
computational complexity; convolutional codes; decoding; tree searching; M-algorithm; breadth-first decoding; code rate; comparison-based selection methods; comparison-based sorting; convolutional codes; linear-time method; linear-time metric sifting; merge sifting methods; survivor metrics; Binary trees; Convolutional codes; Costs; Decoding; Delay; Error analysis; Laboratories; Merging; Sorting; Viterbi algorithm;
Conference_Titel :
Information Theory. 1997. Proceedings., 1997 IEEE International Symposium on
Conference_Location :
Ulm
Print_ISBN :
0-7803-3956-8
DOI :
10.1109/ISIT.1997.613435