多导体电力电缆载波通信系统中的资源分配

Resource allocation for multi-conductor power-cable carrier communications systems

通过实测的多导体电力电缆串扰耦合系数,分析其串扰规律。结合电力线通信的约束,介绍其功率和速率自适应相结合的混合资源分配模型。针对拉格朗日乘子法求解有信号串扰的资源分配局限性,对传输信号及其相关参数进行线性变换以实现信道解耦和将复杂的资源分配分解为多个简单的等效信道优化问题。结合经典注水思想提出一种基于SVD-GMD解耦和脏纸编码的比特加减算法,为了对比还提出基于SVD解耦的比特添加查表算法。在典型的多导体电力电缆环境下,仿真结果表明比特加减算法有效地消除信道间的串扰和利用等效信道的相似性,其在保持系统性能最优的同时有效地降低了资源分配的复杂度。

Based on the measurements of cross-interfere coupling coefficient in a multi-conductor power cable, the characteristics of signal cross-interfere were analyzed. The mixed resource allocation model based on power-rate adaptation was introduced with the restrictions of power-line communications. Owing to the limitation of lagrange multiplier method used to solve the resource allocation problem with cross-interfere, linear transformation was applying for the transmitting signal and its correlative parameters to decouple channels＇ cross-interfere and de- compose the complicated allocation problem into multiple simple equivalent channel optimization problems. A novel bit adding/subtracting algorithm based on SVD-GMD decoupling and dirty-paper coding was proposed with the classical water-filling theory, and another bit adding look-up table algorithm based on SVD decoupling is also proposed for comparison. In the typical multi-conductor power-cable environment, the simulation results indicate the bit adding/subtracting algorithm can eliminate the cross-interfere between equivalent channels and utilize the comparability of equivalent channels effectively, and keep the optimal system performances with the lower complexity.