ABSTRACT
Blackert and Wilson concatenated turbo coding and trellis-coded modulation for multilevel signals in 1996. As a result, turbo trellis-coded (TTC) modulation was developed as in [6]. The main principle of turbo codes was applied to TCM by retaining the important properties and advantages of both of their structures as in [2,6]. TCM has a systematic-feedback convolutional encoder followed by a signal mapper for one or more dimensional codes. In turbo trellis-coded modulation (TTCM), two parallel binary recursive convolutional encoders are used and interleaving, deinterleaving, and puncturing are adapted as placed in [2]. TTCM is a bandwidth-efficient channel coding scheme for multidimensional input symbols that has a structure similar to binary turbo codes, but employs trellis-coded modulation.
