多径效应对低压电力线信道容量的影响  

Influence of Multipath Effect on Channel Capacity of Low Power-line

作　　者：周克[1] 何威[1] 张超[1] 张霞[1] 

机构地区：[1]贵州大学电气工程学院,贵州贵阳550025

出　　处：《现代机械》2013年第6期25-27,32,共4页Modern Machinery

基　　金：贵州省科学技术基金项目(黔科合J字[2013]2125号);贵州省教育厅自然科技基金合同号(2009)0028;贵州大学研究生创新基金(研理工201302)

摘　　要：多径效应会造成信号的传播衰减，降低传输速率和通信质量。以电力线多径传输函数为信道模型，在l～30MHz的频带上分析了信道分支数、分支长度对低压电力线信道容量的影响。采用约束注水法导出了信道容量的闭式最大解，在输入总功率受限的情况下，动态调整子信道功率约束值，保证了输入功率的优化分配。仿真结果表明：多径效应的信道分支数是影响低压电力线信道容量的主要因素。约束注水法控制下的信道容量最大可达700Mbps，可以实现高速数据的传输。Muhipath effect will attenuate the signal propagation, reduce the transmission rate and the quality of com- munication. Set power-line muhipath transmission function as channel model,the influence of channel branches and branch length on channel capacity of low power-line in the frequenee band of 1 - 30MHz is analyzed. Bound water injection is uti- lized to calculate the maximum channel capacity and ensure the optimal distribution of input power in each sub-channel in the condition of limited input power. Simulation result shows that the mainly factor which affects the low power-line channel capacity is channel branch number. Under the control of bound water rejection, the maximum channel capacity can reach 700Mbps which can transmit high speed data.

关 键 词：多径效应 信道容量 约束注水法 高速数据 

分 类 号：TM73[电气工程—电力系统及自动化]