MDMA (Multi Dimensional Multiple Access) implies a the simultaneous implementation of a flexible time multiplex system, an adaptive data rate, and a bit energy variation system. For the latter, it is a system that can be controlled in several dimensions to optimize the exploitation of the channel's capacity and the energy volume of a network.
The frequency modulated Chirp signals can be sequentially superposed and, despite this interference, can be separated on the time axis again by transformation
To that purpose the single Chirp sequences must be staggered time-wise.
Figure 3: Time-wise staggered and superimposed Chirp Signals with adjusted power result at the receivers end into Sinc Pulses with increased bit energy at reduced data rate
This staggering requires distances of integer multiples of the minimum duration δ = 1/B[s], with a consequence of 1 • δB, 2 • δB, 3 • δB, ... n • δB, to avoid distortions by superposing of the pre and post pulsations of the sinc functions after compression. By this methodology it is possible to control the pulse sequences in such a way as to get different data rates by different bit energies per pulse sequence at an always constant transmission power (MDMA).
The result is that while the transmission power is constant it is possible to generate time-wise staggered superposed chirps to receive at the receivers bits with different bit energies (see Figure 3 above).