摘要： 电力线通信（PLC）是物联网、智能电网中重要的通信方式。然而，当有新节点接入PLC网络时，无法正确识别PLC网络中具体的调制方式，从而导致接入失败。为此，通过构建多输入多输出（MIMO）的PLC系统模型，提出一种基于PLC-MIMO结构的协同调制识别方法，以实现新节点自动接入PLC网络。采用多节点的发送信号四阶累积量作为识别器的特征参数，结合极大似然的判决规则进行协同识别，同时引入权重因子，设计一种改进协同调制识别算法来提高正确识别率。仿真结果表明，与一般协同识别算法相比，该算法正确识别率提高6%，具有更好的识别性能，可适用于PLC传感网络系统。

关键词: 物联网, 智能电网, 电力线通信, 多输入多输出, 自动接入, 调制识别

Abstract: Power Line Communication(PLC) is an important communication mode for the internet of things and smart grids.However,the new nodes cannot recognize the specific modulation mode used in PLC networks when try to access the networks,which causes the failure of accessing.Therefore,by constructing the PLC Multiple Input and Multiple Output(MIMO) system model,a cooperative modulation recognition method based on PLC-MIMO structure is proposed for new nodes to access PLC networks automatically.The fourth-order cumulants using the signal transmitted from multiple nodes are taken as the feature parameters,and the decision rule of the maximum likelihood is involved to execute cooperative recognition.At the same time,an improved cooperative modulation recognition algorithm is designed to improve the correct recognition rate.Simulation results show that compared with the single node recognition algorithm and the general collaborative recognition algorithm,the correct recognition rate of the algorithm is improved by 16% and 6% respectively,which has better recognition performance and is suitable for PLC sensor network system.

Key words: Internet of Things(IoT), smart grid, Power Line Communications(PLC), Multiple Input and Multiple Output(MIMO), automatic accessing, modulation recognition

中图分类号: 

• TP391