Comments and additions to recent papers on new convolutional codes
Recent publications on new improved convolutional codes claim different codes to be optimum under the optimum distance spectrum (ODS) criterion. This correspondence presents results from a study independent of the previous works, and seeks to clarify some inconsistencies. In addition, some new improved feed-forward convolutional encoders are presented.
convolutional codes optimum distance spectrum (ods) feed-forward encoders maximum free distance