1. Ungerboeck , G. Csajka , I. 1976
2. Channel coding with multilevel/phase signals;Ungerboeck;IEEE Trans. Inf. Theory,1982
3. Trellis-coded modulation with redundant signal sets Part I: introduction;Ungerboeck;IEEE Commun. Mag.,1987
4. Trellis-coded modulation with redundant signal sets Part II: state of the art;Ungerboeck;IEEE Commun. Mag.,1987
5. Rotationally invariant convolutional channel coding with expanded signal space-Part I: 180°;Wei;IEEE J. Sel. Areas Commun.,1984