On structural analysis for a class of high-rate convolutional codes

The authors perform structural analysis of the class of Ξ codes. They conduct the sufficient conditions that let them determine whether a Ξ code is also a Ξ_f code or not. It is found that the branch structure of the trellis in the YHM-A (Yamada et al. 1983) for a Ξ_f code is the same as that of the trellis for a punctured convolutional coding (PCC). The authors point out that the PCC can be easily constructed from the trellis of a Ξ_f code. Several Pics of constraint lengths 5,. . ., 12 are constructed from the good Ξ_f codes found in CharnKeitKong et al. (1992). To evaluate the bit error performance of the newly found Pics; the distance spectra of these Pics are calculated