Method for identifying bad frames

A device for identifying unusable data blocks during communication in a network, comprising

• a classifier determining means (1) adapted to determine a current classifier (CL_C) in a current data block based on minimum metric information extracted from soft bits produced by a receiver;
• a threshold calculating means (3) which is adapted to calculate a mean value (M) of classifiers (CL_1 to CL_N) of a predetermined number (N) of data blocks previous to said current data block and to calculate a standard deviation (σ) of said classifiers,
• characterized in that
• said threshold calculating means (3) is further adapted to calculate a threshold (TH) for identifying bad frames on the basis of said mean value (M) and said standard deviation (σ) of said classifiers (CL_1 to CL_N);
• and
• a distinguishing means (4) which is adapted to distinguish whether said current data block is usable or not on the basis of a comparison of said threshold (TH) and said current classifier (CL_C).