Improving adaptive receivers performance in molecular communication via diffusion.

Abstract

Forthcoming applications for molecular communications (MC) such as drug-delivery and health monitoring will require robust receiver capabilities to mitigate channel memory and inter symbol interference caused by previous transmitted symbols. Here, the authors introduce an adaptive weighted algorithm to reduce the influence of these factors. This novel signal detection is deployed on to a concentration-based MC system with absorbing receiver which is based on the so-called first passage time concept. The proposed detector has low complexity and does not require explicit channel knowledge. To evaluate authors' proposed algorithm, a theoretical approach is developed to derive the bit error rate (BER). Numerical results also carried out to verify the accuracy of these formulations and establish that the new detector will achieve better performance in comparison with other common low-complex detectors under certain scenarios. Additionally, the authors propose a simple pre-coding technique to combat the sequence of consecutive ones in low ISI scenarios. Also a comparison between detectors is given, which is based on the variation of distance, symbol period, signal-to-noise ratio (SNR), and number of molecules.