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Diffusion-based molecular communication over nanonetworks is an emergingcommunication paradigm that enables nanomachines to communicate by usingmolecules as the information carrier. For such a communication paradigm,Concentration Shift Keying (CSK) has been considered as one of the mostpromising techniques for modulating information symbols, owing to its inherentsimplicity and practicality. CSK modulated subsequent information symbols,however, may interfere with each other due to the random amount of time thatmolecules of each modulated symbols take to reach the receiver nanomachine. Toalleviate Inter Symbol Interference (ISI) problem associated with CSK, wepropose a new modulation technique called Zebra-CSK. The proposed Zebra-CSKadds inhibitor molecules in CSK-modulated molecular signal to selectivelysuppress ISI causing molecules. Numerical results from our newly developedprobabilistic analytical model show that Zebra-CSK not only enhances capacityof the molecular channel but also reduces symbol error probability observed atthe receiver nanomachine.

Robust Modulation Technique for Diffusion-based Molecular Communication in Nanonetworks