摘要：This paper provides a description of the turbo code used by the UMTS thirdgeneration cellular standard, as standardized by the Third-Generation Partnership Project (3GPP), and proposes an efficient decoder suitable for insertion into softwaredefined radio or for use in computer simulations. Because the decoder is implemented in software, rather than hardware, singleprecision floating-point arithmetic is assumed and a variable number of decoder iterations is not only possible but desirable. The wellknown log-MAP decoding algorithm with detailed analysis is proposed and the simulation results are shown.
