宽带MIMO-PLC随机参数信道建模与特性  

Modeling and Analysis of Broadband MIMO-PLC Random Parameter Channels

作　　者：曹旺斌[1] 尹成群[1] 谢志远[1] 梁晓林[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北省保定市071003

出　　处：《电网技术》2017年第3期1029-1034,共6页Power System Technology

基　　金：国家自然科学基金项目(61172075);中央高校基本科研业务费专项资金项目(2014XS78)~~

摘　　要：为研究宽带多输入多输出(multi-input multi-output,MIMO)电力线通信(power line communications,PLC)信道的随机特性,提出了一种基于多导体的MIMO-PLC随机参数信道模型。在建模过程中利用统计分布来表征信道的物理参数,比较分析了参数随机且分支不同的MIMO-PLC宽带信道特征。结果表明,平均信道增益(average channel gain,ACG)服从正态分布,均方根时延扩展(root mean square delay spread,RMS-DS)服从对数正态分布,相干带宽(coherent bandwidth,CB)和均方根时延扩展成反比;分支数越多信道频率选择性衰落和RMS-DS越大,ACG、CB和信道容量越小;与单输入单输出(single-input single-output,SISO)PLC信道相比,MIMO信道的信道容量有较大提升。提出的随机参数模型为MIMO-PLC提供了一种具有实用价值的建模方法,该模型对在复杂环境下MIMO-PLC系统的研究、设计以及工程应用具有重要的指导意义。In order to study random characteristics of branched broadband multi-input multi-output power line communications（MIMO-PLC） channel, a random parameter channel model for broadband MIMO-PLC is proposed in this paper. In the model, physical parameters of the channels are characterized with specified statistical distributions, and characteristics of broadband MIMO-PLC channel with different branches and parameters are analyzed. Results show that average channel gain（ACG） and root mean square delay spread（RMS-DS） follow normal and lognormal distributions respectively, and coherent bandwidth（CB） is in inverse proportion to RMS-DS. With larger number of branches, channel frequency selective fading and RMS-DS are larger, and ACG, CB and channel capacity are smaller. Capacity of MIMO channels have a great improvement compared with single-input single-output（SISO） channels. The proposed model provides a modeling method with practical value, and the model has important guiding significance for research, design and engineering application of MIMO-PLC system in complex environments.

关 键 词：宽带 多输入多输出 多导体 电力线载波通信 随机参数信道 

分 类 号：TM73[电气工程—电力系统及自动化] TM911.7