Amplify-and-forward relaying in mobile multi-hop molecular communication via diffusion

摘要

In this paper, we investigate amplify-and-forward (AF) relaying scheme for mobile three-dimensional(3D) multi-hop molecular communication via diffusion (MCvD) in the stochastic channel by usingdifferent type of molecules (DTM) and same type of molecules (STM) in each hop, respectively. Underthe DTM scheme, both the inter-symbol interference (ISI) and the noise of each link are taken intoaccount Compared with the DTM scheme, an additional factor should be considered for the STMscheme, which is the self-interference (SI) effect. Under DTM and STM, we derive the mathematicalexpressions of optimal detection thresholds at receiver node in mobile two-hop MCvD system byusing the maximum-a-posterior (MAP) decision method. Then we extend the analysis to mobile multihopMCvD system. Furthermore, the performances of bit error probability and mutual information areevaluated via particle-based simulation of the Brownian motion. The numerical and simulation resultsreveal that the performance under DTM outperforms that under STM, which indicates the potentialof AF relaying scheme under DTM to improve the overall performance of this system. Besides, thecomparison results between mobile and static multi-hop link under DTM and STM are given. Theobtained results are expected to provide guidance significance for designing mobile multi-hop MCvDsystem with lower bit error probability and higher mutual information.