电力线载波通信中电网结构参数对信道容量的影响

提出了一种基于传输线理论的信道容量简化算法,在高带宽利用率条件下将信道容量解耦成几个独立的部分,分别用于研究传输距离、单根分支线对信道容量的影响及分支线之间的耦合效果。通过对无分支结构的电力线信道容量分析,提出了信道容量的简化算法及其适用条件。将分支线对信道容量的影响,分解成了对分支线长度及所接负载影响的研究,通过对部分典型负载特征的分析,讨论信道容量对负载的敏感性。利用统计方法研究了分支之间的耦合效应,当电力网中分支相距较远时,该耦合效果可以忽略不计,则信道容量可以看作与传输距离和分支线数量呈线性关系。仿真结果表明,该简化算法与传统计算方法具有较好的一致性,可用于分析不同网络结构对电力线传输性能的影响和信道容量的快速估计。

Effects of Power Network Parameters on Channel Capacity in Power Line Carrier Communication

A simplified method for channel capacity estimation is derived based on the transmission line theory under the condition of high bandwidth utilization. With this method, the channel capacity is decoupled into several independent components which may help to investigate the effects of backbone and branch, respectively. Analysis of the channel capacity of the structure without any branches reveals the applicable condition for the simplified method, while separate branch effects are investigated by considering the branch length together with the loads. According to investigations on the effects of typical loads, the load sensibility of the channel capacity is obtained. In addition, the coupling effects caused by branch interactions are studied statistically. When the branches are far apart, their coupling effects can be neglected and in this case the channel capacity is in linear relationship to the transmission distance and number of branches. The simulation results of the proposed method are in fairly good agreement with those of the conventional one showing it is applicable to analysis of the influence of different network structures on the performance of power network parameters and fast estimate of the channel capacity. This work is supported by Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) of China (No. 20130201120008).