Periodic clock changes as generalization of multiple access techniques

Multiple access techniques are generally expressed differently depending on the way of multiplexing signals. It is referred as FDMA when multiple access is based on the frequency domain, as TDMA when the time domain is considered and CDMA when codes are used. In this work, it is shown that, using periodic clock changes (PCC) based on linear periodic time varying filters (LPTV), the same general formulation can be used to express most of the classical multiple access techniques