受分子寿命影响的中继最大可达传输速率

Relay maximum achievable transmission rate affected by molecular lifetime

基于扩散的分子通信以分子作为信息载体进行信息的传输,分子在信道中做布朗运动,遵循菲克扩散定律。随着扩散距离的增加,分子浓度急速衰减,造成信道可达传输速率非常低,因此,可以采用中继传输来提高传输性能。鉴于扩散分子通信中继可达传输速率是业界研究的热点与难点,采用配体-受体结合机制,考虑分子寿命及分子到达概率等因素的影响,研究了基于扩散的分子通信中继信道对分子传输可达速率的影响,也探索了基于分子寿命的中继节点位置对中继可达传输速率的影响。仿真结果显示,随着分子寿命的增加,分子在信道中存在的时间增加,使得信道最大传输速率增大。同时,随着分子寿命的增加,中继节点需要靠向接收端,才能使信道最大传输速率达到最大。

Diffusion-based molecular communication makes molecules as the information carrier for the information transmission,the molecules do Brownian motion in the channel,following the Fick's law.With the diffusion distance increasing,the molecular concentration is rapidly attenuated,resulting in a very low channel achievable transmission rate.Therefore,relay can be used to improve the transmission performance.In view of the transmission rate in diffusion-based molecular communication relay channel is a hot spot in the field of research,this paper adopts the ligand-receptor binding mechanism,considering the molecular lifetime,molecular reach probability and other impact factors,and study the influence of achievable transmission rate in diffusion-based molecular communication,the paper study also investigates the effect of relay achievable transmission rate in the relay node location based on molecular lifetime.The simulation results show that with the molecular lifetime increasing,the time of the molecules in the channel increases,and the maximum transmission rate increases.At the same time,with the molecular lifetime increasing,the relay node need to approach to the receiver node so as reach the maximum transmission rate.