Cross-over component code construction for multi-level block modulation codes
Tadao Kasami, Toyoo Takata, Toru Fujiwara, Shu Lin · NASA Technical Reports Server (NASA) · 1990
This paper investigates the multilevel technique for combining block coding and modulation. Several specific methods for constructing multilevel block modulation codes with interdependency among component codes are presented. Given a multilevel block modulation code C with no interdependency among the binary component codes, the proposed methods give a multilevel block modulation code C-prime which has the same rate as C, a minimum squared Euclidean distance not less than that of C, a trellis diagram with the same number of states as that of C, and a smaller number of nearest neighbor codewords than that of C.