Introduction - If you have any usage issues, please Google them yourself
Multi-level modulation, the symbols are mapped to the same bit different with different characteristics of the reliability of the introduction of high-end soft-output demodulation algorithm, derived from a simple generic algorithm, the Gray mapping in any manner that they are able to the use of a group of the same recursive formula for calculating the two-bit soft-decision information. Provides a low-complexity high-performance general-purpose high-end soft-output demodulation algorithm.