Multilevel differential modulation techniques (64-DAPSK) for multicarrier transmission systems. - Volker Engels; Hermann Rohling (Eur. Trans. Telecommun., 1995)

Differential modulation techniques for a 34 MBit/s radio channel using orthogonal frequency division multiplexing. - Volker Engels; Hermann Rohling (Wirel. Pers. Commun., 1995)

Multi-resolution 64-DAPSK modulation in a hierarchical COFDM transmission system. - Volker Engels; Hermann Rohling (IEEE Trans. Broadcast., 1998)

Performance analysis of Viterbi decoding for 64-DAPSK and 64-QAM modulated OFDM signals. - Thomas May; Hermann Rohling; Volker Engels (IEEE Trans. Commun., 1998)