谢文旺,孙云莲.基于OS-ELM的宽带电力线通信解映射优化算法[J].电测与仪表,2019,56(13):1-6，50. Xie Wenwang,Sun Yunlian.Optimization algorithm for de mapping module of wideband power line communication based on OS-ELM[J].Electrical Measurement & Instrumentation,2019,56(13):1-6，50.
基于OS-ELM的宽带电力线通信解映射优化算法
Optimization algorithm for de mapping module of wideband power line communication based on OS-ELM
In order to ensure the reliability of the communication, the channel estimation technique is widely used in the OFDM system to reduce the bit error rate in the traditional broadband power line communication system. However, due to the need of importing a large number of pilot sequences, the channel estimation technology will take up valuable spectrum resources. Its implementation process is complex and will greatly reduce the effectiveness of communication. Therefore, we proposed a optimization algorithm of de mapping module for broadband PLC based on the Online Sequential-Extreme Learning Machine (OS-ELM). This algorithm is an online learning improvement algorithm of the traditional Extreme Learning Machine (ELM), which can combine batch processing and successive iteration to update training data and network parameters. This paper sets up a simulation model of the broadband power line communication system based on the actual data collected from the user electric meters in a residential district of Guangdong province. The simulation test is carried out under the measured 500m four-path channel and compared with the BP neural network and the traditional ELM. The experimental results show that the introduction of OS-ELM in a variety of SNR communication environments shows faster training speed and better anti-interference characteristics. Except for the extremely poor communication environment with low SNR, the algorithm can effectively improve the communication quality and reduce the bit error rate.
