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Currently, Communication via Diffusion (CvD) is one of the most prominent systems in nano-networks. In this paper, the authors evaluate the effects of two major interference sources, Inter-Symbol Interference (ISI) and Co-channel Interference (CCI) in the CvD system using different modulation techniques. In the analysis of this paper, they use two modulation techniques, namely Concentration Shift Keying (CSK) and Molecule Shift Keying (MoSK) that they proposed in their previous paper. These techniques are suitable for the unique properties of messenger molecule concentration waves in nano-networks. Using a two transmitting couple simulation environment, the channel capacity performances of the CvD system utilizing these modulation techniques are evaluated in terms of communication range, distance between interfering sources, physical size of devices, and average transmission power.