MIMO Molecular Communication in a Cylindrical Bounded Environment with Anomalous Diffusion

An anomalous diffusion-based molecular communication (ADMC) system provides a viable solution for information exchange in biological and microfluidic environments where electromagnetic communication is impractical. This study examines the behavior of a MIMO molecular communication system that is significantly influenced by the diffusion process within a finite cylindrical environment. The diffusion process is thus considered a realistic representation of the propagation scenarios occurring in blood vessels and microfluidic channels. The cylindrical surface has reflective boundary conditions at its walls and ends, which makes the idea of a discrete-time MIMO channel (DTMC) model incorporating inter-symbol interference (ISI) much more realistic. The channel impulse response (CIR) is thus derived from the diffusion channel model, and the communication system is consequently modeled through on-off keying (OOK) and a Poisson noise model at the receivers. In this paper, linear detection methodologies, such as minimum mean-square error (MMSE), zero-forcing (ZF), and equal-gain combining (EGC), are examined. The system's performance is analyzed and plotted with regard to the bit error rate, probability of error, and channel capacity, which are the primary performance indicators. The analysis expressions show that the characteristics of anomalous diffusion and cylindrical confinement have a large effect on the reliability and capacity of the system.