  Molecular communication in nanonetworks is an emerging communication paradigm
where molecules are used as information carriers. Concentration Shift Keying
(CSK) and Molecule Shift Keying (MoSK) are being studied extensively for the
short and medium range molecular nanonetworks. It is observed that MoSK
outperforms CSK. However, MoSK requires different types of molecules for
encoding which render transmitter and receiver complexities. We propose a
modulation scheme called On-Off MoSK (OOMoSK) in which, molecules are released
for information bit 1 and no molecule is released for 0. The proposed scheme
enjoys reduced number of the types of molecules for encoding. Numerical results
show that the proposed scheme enhances channel capacity and Symbol Error Rate
(SER).
