The Minimum Likelihood APP Based Early Stopping Criterion for Multi-Binary Turbo Codes

1 Department of Communications, Faculty of Electronics and Telecommunications, Bd. V. Pârvan Nr. 2, 300223 Timişoara, e-mail: [email protected], [email protected] 2 Electronic Department,ENST Bretagne Technopôle de Brest Iroise CS 83 818 29238 BREST Cedex 3, France, e-mail: [email protected] Abstract – This paper presents a simple and efficient criterion for stopping the iteration process in multibinary symbol turbo-decoding with a negligible degradation of the error performance. The criterion is devised starting to minimum log-likelihood ratio (LLR) based stopping criterion used for binary turbo codes (BTC). Two variants consist in particularizations of the same idea in the MAP and MaxLogMAP decoding algorithm cases. The proposed two variants criterion has efficiency close to the optimum (genie) criterion and is simple to perform.