New realization method for linear periodic time-varying filters

For channel modelisation, modulation and analogue scrambling, the modern telecommunications use often linear periodic time-varying filters. The authors recall the definition of these filters. In particular, it is shown that a stationary process subjected to a linear periodic filter becomes cyclostationary. In this paper, we show that any linear periodic filter can be realized by means of periodic clock changes. An original implementation method is then introduced. An example illustrates the periodic clock change implementation and presents the advantages of the new implementation technique in comparison to the classical one.