A Modular Approach to a Digital 60-Channel Transmultiplexer Using Directional Filters

A multistep transmultiplexer approach with a single-way modulation scheme applying minimum phase wave digital directional or transversal filters is proposed. Furthermore, the impact of signaling, pilots, and spectral shaping at the PCM end is investigated. The results of a filter design based on wave digital filters is given. The main merits of this approach are, at a moderate level of computational complexity, its absolute stability, the low basic group delay, and its modularity. Due to modularity, the central unit (the TDM/FDM and FDM/TDM translators) is composed of only three different filter types requiring neither DFT, FFT, or associated processors nor modulators. As a consequence, the new approach is suitable for LSI/VLSI integration with the potential of efficient testability.

[1]  A. Peled,et al.  TDM-FDM Conversion Requiring Reduced Computation Complexity , 1978, IEEE Trans. Commun..

[2]  Jacques Lucien Daguet,et al.  Interpolation, extrapolation, and reduction of computation speed in digital filters , 1974 .

[3]  S. Freeny,et al.  TDM/FDM translation as an application of digital signal processing , 1980, IEEE Communications Magazine.

[4]  Bede Liu,et al.  Calculation of narrow-band spectra by direct decimation , 1978 .

[5]  L. Rabiner,et al.  A digital signal processing approach to interpolation , 1973 .

[6]  T. Tsuda,et al.  Digital TDM-FDM Translator with Multistage Structure , 1978, IEEE Trans. Commun..

[7]  J. Peek,et al.  A Digital Receiver for Tone Detection Applications , 1976, IEEE Trans. Commun..

[8]  C. Kurth,et al.  Generation of single-sideband signals in multiplex communication systems , 1976 .

[9]  Georges Bonnerot,et al.  Digital Processing Techniques in the 60 Channel Transmultiplexer , 1978, IEEE Trans. Commun..

[10]  Daniele Pietro Carlo Pelloni.  Dimensionierung von digitalen TDM-FDM Transmultiplexern nach der Polyphasenmethode , 1979 .

[11]  Alfred Fettweis,et al.  On parasitic oscillations in digital filters under looped conditions , 1977 .

[12]  C. Baugh.  Design and Performance of a Digital Multifrequency Receiver , 1977, IEEE Trans. Commun..

[13]  S. Darlington.  On digital single-sideband modulators , 1970 .

[14]  T. Claasen,et al.  A generalized scheme for an all-digital time-division multiplex to frequency-division multiplex translator , 1978 .

[15]  H. Gockler,et al.  A comprehensive survey of digital transmultiplexing methods , 1981, Proceedings of the IEEE.

[16]  V. Belevitch,et al.  Classical network theory , 1968 .

[17]  L.R. Rabiner,et al.  Interpolation and decimation of digital signals—A tutorial review , 1981, Proceedings of the IEEE.

[18]  Hans-Wilhelm Schüßler.  Digitale Systeme zur Signalverarbeitung , 1973 .

[19]  W. Wegener,et al.  Wave digital directional filters with reduced number of multipliers and adders , 1979 .

[20]  Heinz G. Gockler,et al.  Prinzipien und Anwendungsmöglichkeiten digitaler Filter in der Nachrichtentechnik , 1981 .