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Communication via diffusion of molecules is an effective method for transporting information in nano-networks. In this paper, novel modulation techniques called Concentration Shift Keying (CSK) and Molecule Shift Keying (MoSK) are proposed for coding and decoding information of the so-called messenger molecule concentration waves in nano-networks. The first technique, CSK, modulates the information via the variation in the concentration of the messenger molecules whereas MoSK utilizes different types of messenger molecules to represent the information. Using simulation, the performance of these modulation techniques is evaluated in terms of susceptibility to noise and transmission power requirements.
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