Design of Multiplexed link with zero Intersymbol Interference for Bandlimited Channels using Time-limited Orthogonal Signaling

This paper explores the design of time-limited input-output waveforms, the outputs being orthogonal, for band-limited channels, whose characteristics are known apriori. Hence, the channel can support baseband multiplexed transmission without Intersymbol Interference. The problem has been worked out for two cases of channel modeling the rational transfer function channel model and the distributed parameter channel model, using three methods of signal orthogonalization. For the rational function channel model, the signaling interval can be made arbitrarily small, thus permitting high signaling rates. For the distributed parameter channel model, the signaling rate works out to be a function of the line parameters and line length. At the receiving end, since the signals are orthogonal, a bank of matched filters separates the signals. The system performance has been evaluated in the presence of channel noise.