Title :
On SOVA for nonbinary codes
Author :
Cong, Ling ; Xiaofu, Wu ; Songgeng, Sun
Author_Institution :
Nanjing Inst. of Commun. Eng., China
Abstract :
For binary codes, Fossorier et al. (1998), have shown that the soft-output Viterbi algorithm (SOVA) becomes equivalent to the max-log-maximum a posteriori (MAP) algorithm after a modification. In this letter, such modified SOVA is generalized into nonbinary cases. The equivalence between the modified SOVA and the max-log-MAP algorithm is proved more straightforwardly. The modified SOVA requires only add-compare-select operations and is suitable for high-speed parallel implementation.
Keywords :
maximum likelihood decoding; MAP algorithm; SOVA; add-compare-select operations; high-speed parallel implementation; max-log-maximum a posteriori algorithm; nonbinary codes; soft-output Viterbi algorithm; AWGN; Binary codes; Concatenated codes; Degradation; Iterative algorithms; Iterative decoding; Maximum likelihood decoding; Sun; Vectors; Viterbi algorithm;
Conference_Titel :
Communications, 1999. APCC/OECC '99. Fifth Asia-Pacific Conference on ... and Fourth Optoelectronics and Communications Conference
Conference_Location :
Beijing, China
Print_ISBN :
7-5635-0402-8
DOI :
10.1109/APCC.1999.824972
