面向配电网大规模接入的CSMA-NOMA电力线载波通信系统的研究

Research on CSMA-NOMA Power Line Carrier Communication System for Large-scale Access to Distribution Network

随着智能电网建设的不断推进,配电网中产生的数据量呈指数增长,传统电力线载波通信网络已无法满足大量用电信息采集设备对频谱资源的高需求。对此利用载波侦听多址(carrier sense multiple access,CSMA)访问技术和非正交多址(non-orthogonal multiple access,NOMA)接入技术,构建基于大规模接入的CSMA-NOMA电力线载波通信系统。该方案旨在利用NOMA接入技术的非正交传输特性,进一步提高电力专网的频谱资源利用率;同时采用基于CSMA的冲突避免机制,可降低多用户同时接入带来的网络间冲突。为有效地实现冲突率的检测,将用户传输数据包的过程建模为马尔可夫链;同时,多用户信道的数据速率较高和冲突率较低,可明显增加系统吞吐量。仿真结果表明,所提方案在高网络负载条件下具有明显的优势。

With the continuous promotion of smart grid construction,the amount of data generated in the distribution network is growing exponentially,and the traditional power line carrier network can no longer meet the high demand for spectrum resources from a large number of power information collection devices.This paper constructs a CSMA-NOMA power line carrier network model based on mass access,aiming to further improve the spectrum resource utilization of limited power private networks by using the non-orthogonal transmission characteristics of non-orthogonal multiple access(NOMA)technology,and at the same time,a conflict avoidance mechanism based on carrier sense multiple access(CSMA)is adopted to reduce the inter-network conflict brought by multiple users accessing simultaneously.To achieve the conflict rate detection effectively,the process of user packet transmission is modeled as a Markov chain in this paper,while the system throughput is increased due to the higher data rate and lower conflict rate of the multi-user channel.Simulation results show that the proposed scheme in this paper has significant advantages under high network load conditions.