基于电力线通信网络的缓存技术与信道分配技术的研究

发布时间：2018-07-16 18:43

【摘要】：近年来,随着传感技术、通信技术、控制技术等的快速发展,智能电网系统也成为研究与开发的热点。由于各个电力设备、电力传感器使用电力线进行连接,电力线通信(Power Line Communication,PLC)成为智能电网中经济、实用的通信方式。然而,电力线通信存在多径效应、信号衰减和脉冲噪声干扰等问题,这导致了电力线通信信道容量小,平均传输速率低以及通信可靠性差等问题。本文围绕如何提高智能电网中电力线通信性能这一中心,开展一系列研究,并取得如下成果:(1)为了提高电力线通信系统中,通信的可靠性与容量,提出在多区域协作环境中,建立了 PLC的多输入多输出(Multiple Input Multiple Output,MIMO)通信模型。并在此模型基础上,设计了电力线最优发射节点的选择技术,并分析了这种技术下的系统性能。仿真结果表明,在多区域和多节点情况下采用发射分集思想可以有效提高系统的信道容量。(2)为了提高终端用户下载数据的速率、系统能耗,提出在电力线系统中引入缓存机制。在对多节点协作区域中,设计了具有缓存结构的多个中继节点以联合传输形式为区域边缘用户提供数据服务的模型。以整个系统总功耗最小化为目标建立了仿真系统,分析了节点能耗和回程链路能耗。仿真结果表明了缓存机制的引入可以很大程度上节约系统能量。(3)在智能家庭电力线拓扑结构的基础上,设计了一种基于OFDM机制的子信道分配算法。与其它信道分配算法相比,本课题设计的算法能充分考虑网络拓扑、干扰和流量公平约束等限制条件。仿真表明,该算法在提高系统总吞吐量和保证网络用户公平性上有更好的表现。
[Abstract]:In recent years, with the rapid development of sensing technology, communication technology and control technology, smart grid system has become a research and development hotspot. Power Line Communication PLC (PLC) has become an economical and practical communication mode in smart grid because of the connection of power sensor with power line. However, there are many problems in power line communication, such as multipath effect, signal attenuation and impulse noise interference, which lead to low capacity of power line communication channel, low average transmission rate and poor communication reliability. In order to improve the reliability and capacity of power line communication in power line communication system, this paper focuses on how to improve the performance of power line communication in smart grid, and obtains the following results: (1) in order to improve the reliability and capacity of power line communication system, a multi-area cooperative environment is proposed. The multiple input multiple output MIMO (MIMO) communication model of PLC is established. On the basis of this model, the selection technology of the optimal power line transmitting node is designed, and the system performance under this technology is analyzed. The simulation results show that the channel capacity of the system can be improved effectively by using transmit diversity in multi-area and multi-node cases. (2) in order to improve the data download rate of the end users and the energy consumption of the system, a buffer mechanism is proposed in the power line system. In the multi-node cooperative region, a model of multiple relay nodes with buffer structure is designed to provide data service to the users at the edge of the region in the form of joint transmission. Aiming at minimizing the total power consumption of the whole system, the simulation system is established, and the node energy consumption and the backhaul link energy consumption are analyzed. Simulation results show that the introduction of buffer mechanism can save the system energy to a great extent. (3) based on the intelligent home power line topology, a sub-channel allocation algorithm based on OFDM mechanism is designed. Compared with other channel allocation algorithms, the proposed algorithm can fully consider the network topology, interference and traffic fairness constraints. Simulation results show that the proposed algorithm can improve the total throughput of the system and ensure the fairness of network users.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM73

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