Interpulse interference effects on orthogonal division multiplexing systems

An investigation is conducted concerning the usefulness of orthogonal division multiplexing methods carrying continuous messages, taking into account the effects of interpulse interference on the transmission quality. Systems with N channels, in which N is a power of 2, are considered. It is assumed that the modulating values are obtained by sampling N independent identically distributed, ergodic stochastic processes. It is found that the possibilities concerning a use of the considered methods are practically unlimited if pulse shaping and/or way compensation techniques are used. The widest range of possibilities and the most uniform behavior is obtained if time division multiplex (TDM) processes are used. A multiplexing scheme proposed by Lueke (1968), which is based on a use of Haar functions, is also considered.