Ring-TCM codes for QAM
Francisco Javier Ramos López, R.A. Carrasco, Patrick Guy Farrell · Electronics Letters · 1992
Multilevel convolutional codes based on rings of integers suitable for rectangular QAM constellations are presented. Codes performing at similar coding gains to binary TCM codes have already been found which, in addition, are 90° phase rotationally invariant. This means a significant improvement in channels subject to likely loss of phase synchronisation.