Weighted Higher Order Detector for Diffusion based Molecular Communications

Abstract

In diffusion-based molecular communication (MC), some of the message molecules may not reach the receiver in their expected time slot due to the diffusion process. These straying molecules from previous time slots interfere with the message molecules of the current time slot which leads to inter-symbol-interference (ISI) in MC. In this paper, we propose and analyze the weighted higher order detector for MC systems to mitigate/reduce the ISI and noise. The proposed weighted higher order sum of molecules concentration enhances the signal-to-noise ratio due to the reduced channel tail and noise effect in a frame. Further, the proposed detector does not estimate instantaneous channel impulse response at the receiver, hence, is simple and has low complexity. Numerical results show that the proposed detector performs better than the conventional direct sum detection method. The impact of diffusion coefficient, number of molecules and noise distribution on the proposed detector is also analyzed. © 2019 IEEE.