UDC 621.391
IMPLEMENTATION OF THE PYNDIAH-CHASE ITERATIVE DECODING ALGORITHM FOR HAMMING BLOCK TURBO CODES
S. M. Kadantcev, department head, CTCUEWT, Tambov, Russia;
orcid.org/0000-0001-8238-2273, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
P. A. Kazak, head of department branch, CTCUEWT, Tambov, Russia;
orcid.org/0000-0002-8749-5290, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
N. S. Korzh, scientific company operator, CTCUEWT, Tambov, Russia;
orcid.org/0000-0002-8496-8830, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
The work studying noise immunity of Hamming block turbo code (195,99) for the case of its application in the standard of digital radio mobility DMR is carried out. We focus on the processes of channel decoding, the formation of symbolic array, as well as iterative decoding of signal-interfering mixture of adopted implementation. Special attention is paid to the subject of probabilistic determination of bit solutions with nontrivial signal-code construction. The relevance of the study is dictated by the need of a comprehensive study of DMR signal noise immunity. The aim of the work is to describe the features of soft 4FSK signal reception procedure using a logarithm likelihood ratio, compare decoding results of code structures using Pyndiah-Chase algorithm with an algebraic syndromic method, determine the optimal number of turbo code decoding operations in low SNR.
Key words: iterative decoding, Hamming code, block turbo code, noise immunity, decoding algorithm, Pyndiah-Chase algorithm, SNR, likelihood ratio, soft decisions, sub-optimal algorithm, 4FSK modulation, DMR standard, digital radio.