Channel capacity analysis for molecular communication with continuous molecule emission

Molecular communication is a promising paradigm to communicate at nanoscale and it is inspired by nature. The molecules can be sent into diffusion channel by different emission scheme and received by ligand-based receptors. Instantaneous and continuous emissions are two important molecule emission schemes in molecular communication. Up to now, very limited literatures consider the capacity in molecular communication with continuous emission. In this paper, we study the channel capacity of diffusion and ligand-based molecular communication system with continuous molecule emission scheme. We establish a basic diffusion-based propagation model based on the On-Off keying and time slot scheme. The capacity expression of the continuous emission scheme is derived with considering the effects of the channel memory and ligand-receptor binding mechanisms. The numerical results show that the channel capacity is bound up with the physical parameters of ligand-receptor and diffusion channel.