Hi, I am implenting a turbo decoder for a channel coding scheme. In that I have to implement a SISO(Soft Input Soft Output)...

Hi, I am implenting a turbo decoder for a channel coding scheme. In that I have to implement a SISO(Soft Input Soft Output) decoder for my system. In SISO, I have to compute loglikelihood ratios which invloves formulas involving arctanh(x). I am facing the problem when