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 using different type of molecules (DTM) and same type of molecules (STM) in each hop, respectively. Under the DTM scheme, both the inter-symbol interference (ISI) and the noise of each link are taken into account Compared with the DTM scheme, an additional factor should be considered for the STM scheme, which is the self-interference (SI) effect. Under DTM and STM, we derive the mathematical expressions of optimal detection thresholds at receiver node in mobile two-hop MCvD system by using the maximum-a-posterior (MAP) decision method. Then we extend the analysis to mobile multi-hop MCvD system. Furthermore, the performances of bit error probability and mutual information are evaluated via particle-based simulation of the Brownian motion. The numerical and simulation results reveal that the performance under DTM outperforms that under STM, which indicates the potential of AF relaying scheme under DTM to improve the overall performance of this system. Besides, the comparison results between mobile and static multi-hop link under DTM and STM are given. The obtained results are expected to provide guidance significance for designing mobile multi-hop MCvD system with lower bit error probability and higher mutual information.

在本文中，我们通过使用不同类型的分子 (DTM) 和相同类型的分子，研究了随机信道中通过扩散 (MCvD) 进行移动三维 (3D) 多跳分子通信的放大转发 (AF) 中继方案。分子（STM）在每一跳，分别。DTM方案下，既考虑了符号间干扰（ISI）又考虑了各链路的噪声 与DTM方案相比，STM方案还需要考虑一个额外的因素，即自干扰（SI）影响。在DTM和STM下，我们利用最大后验（MAP）决策方法推导出移动二跳MCvD系统中接收节点的最优检测阈值的数学表达式。然后我们将分析扩展到移动多跳 MCvD 系统。此外，通过布朗运动的基于粒子的模拟来评估误码率和互信息的性能。数值和仿真结果表明，DTM 下的性能优于 STM 下的性能，这表明 DTM 下的 AF 中继方案具有提高该系统整体性能的潜力。此外，给出了DTM和STM下移动和静态多跳链路的比较结果。所得结果有望为设计具有较低误码率和较高互信息的移动多跳MCvD系统提供指导意义。这表明 DTM 下的 AF 中继方案具有提高该系统整体性能的潜力。此外，给出了DTM和STM下移动和静态多跳链路的比较结果。所得结果有望为设计具有较低误码率和较高互信息的移动多跳MCvD系统提供指导意义。这表明 DTM 下的 AF 中继方案具有提高该系统整体性能的潜力。此外，给出了DTM和STM下移动和静态多跳链路的比较结果。所得结果有望为设计具有较低误码率和较高互信息的移动多跳MCvD系统提供指导意义。