Diversity Reception Based Non-coherent Signal Detection for Molecular Communication

• 1、School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Abstract：Molecular communication via diffusion (MCvD) is a new technology for information communication in nano-scale systems. In traditional detection schemes, molecular communication receivers usually only detect the concentration of a single messenger molecule, while ignoring the biochemical reaction mechanism commonly existing in the channel and the concentration of other molecular participants that change coordinately. In this paper, we propose a non-coherent signal detection scheme, which makes full use of the dynamic concentrations of multiple molecules under biochemical reaction and combines the transient characteristics of the messenger, reactant and product molecules to construct a virtual single-input multiple-output (SIMO) signal detection scheme. After extracting the features of concentrations of the received signals, the diversity reception principle is used to improve the signal-to-noise ratio (SNR) and obtain better detection performance. Meanwhile, the soft and hard decision strategy are designed to release the potential diversity gain. The feasibility of our proposed scheme is proved by theoretical analysis and numerical simulation. Compared with traditional single-substance molecular detection schemes, our new scheme greatly reduces the bit error rate (BER) without increasing the complexity, so it has great potential in nano-scale communication network.

Keywords： Molecular communication, diversity reception, non-coherent detection, multiple molecular participants.