多导体电力电缆载波通信中的频谱优化方法

使用多导体电力电缆的高速数据传输面临严重的信号串扰问题。该文通过测量实际的电力电缆的串扰参数，分析了多导体电缆的串扰规律。为了提高数据传输速率，深入研究了多导体电缆数据传输的频谱优化问题。首先，讨论了采用拉格朗日乘子求解带串扰项的频谱优化方法。然后，针对该方法的局限性，提出通过对传输信号进行线性变换，实现信道解耦，进而将复杂的优化问题分解为多个简单的优化问题。在信号功率限制的条件下，对算法的应用范围进行了推广。仿真分析表明，结合信道解耦的频谱优化方法显著提高了多导体电缆的数据传输率，有效地克服了信号串扰对高速电力线通信系统的影响。

Spectrum Optimization of Multi-conductor Power Cable for the Power-line Communications

The high-speed power-line communications using multi-conductor power cable encounter serious interference. Based on the measurements of the transfer functions of a multi-conductor power cable, the characteristics of the signal interference are analyzed. In order to increase the data transmission rate, the spectrum optimization of the data communications with multi-conductor power cable was investigated. The Lagrange multiplier was firstly used for solving spectrum optimization problem with the interference factor. Owing to its limited benefit of that method, a new method was introduced that linear transformation was applied to transmission signals and the channels were de-coupled. Hence, the complicated spectrum optimization problem with coupled multi-conductor power cables was disassembled into simple optimization problems. The application of the algorithm was extended to the environment with limited signal spectrum. The simulation results showed that the method of combining spectrum optimization with channel decoupling could increase the data rate remarkably and eliminated the interferences effectively in the high-speed rate communications with power cables.