多用户分子通信模型的比特错误率和信道容量分析  

Bit Error Rate and Capacity Analysis for Multi-user Molecular Communication Model

作　　者：程珍[1] 章益铭 CHENG Zhen;ZHANG Yi-ming(College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou 310023, China)

机构地区：[1]浙江工业大学计算机科学与技术学院

出　　处：《小型微型计算机系统》2019年第8期1666-1671,共6页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(61472367)资助;浙江省自然科学基金项目(LY19F020029)资助

摘　　要：在多用户分子通信模型中,由于分子的随机扩散,码间干扰和用户间干扰不可避免地同时存在.首先,利用泊松分布逼近二项分布得到了当前时隙接收方纳米机器收到分子的个数;然后,通过码间干扰和用户间干扰的分子数所服从的Skellam分布,得到了最优检测阈值的数学表达式.在此基础上分析了该系统的比特错误率和信道容量性能.仿真结果展示了如何控制参数包括扩散系数、发送方纳米机器和接收方纳米机器之间的距离、信道传输概率、每个时隙释放的分子个数以及每个时隙的持续时间,从而达到降低比特错误率和提高信道容量的目的.In the multi-user molecular communication system,the Inter-symbol Interference( ISI) and Inter-user Interference unavoidably( IUI) exit because of the stochastic diffusion of the molecules. We first use the Poisson distribution to approximate the Binomial distribution in order to obtain the total number of molecules received in the current time slot. Then the mathematical expressions of optimal decision threshold is derived by using the Skellam distribution,which the number of the ISI and IUI molecules follow. On this basis,the bit error rate and capacity performance of this system is analyzed. Numerical results are shown how to control the parameters including the diffusion coefficient,the distance between transmitter nanomachine and receiver nanomachine,the channel transmission probability,the number of molecules emitted in each time slot and each time slot duration to reduce the BER and improve the capacity.

关 键 词：分子通信 多用户 码间干扰 用户间干扰 最优检测阈值 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]