Nanotechnologies offer astounding applications in biomedical, industrial, and military. Nano-devices, called nanomachines, are the blessings of nanotechnology built from individual molecule or arranged set of molecules that are nano to micrometer in size. Communication among nanomachines, namely nanonetworks, can be built through mechanical, acoustic, and electromagnetic or optical means. However, conventional communication technologies are found inapt for nanonetworks mainly due to the size and power consumption of the devices in operation. Molecular communication appears to be a promising approach for nanonetworks. In this dissertation, we propose a modulation technique for molecular communication.
We, first, model a free diffusion-based molecular communication channel and analyze capacity and Bit Error Rate (BER) both without memory and with memory. We, then, propose a modulation technique called On Off Molecule Shift Keying (OOMoSK) in which, the information bits in a symbol are encoded onto different types of molecules and the molecules are released if the information bit is 1 and no molecule is released for the information bit 0. Our proposed scheme requires reduced number of the types of molecules for encoding. Upon comparing with Concentration Shift Keying (CSK) and Molecule Shift Keying (MoSK), we observe that the proposed modulation technique outperforms other modulation schemes.