低压电网信道容量的研究

RESEARCH ON THE CHANNEL CAPACITY IN A LOW VOLTAGE NETWORK CHANNEL

首先给出了低压电网信道模型在1 MHz-10 MHz频带内噪声特性的指数规律拟合公式与衰减特性的三阶自回归模型;然后应用信息论的输入功率最优分配算法计算出两种环境下的信道容量,分别为110 Mbit/s和170 Mbit/s;最后,基于给出的信道模型,给出了应用自适应正交频分复用(OFDM)的低压电网通信系统,在误码率为10-6时,可达到约100 Mbit/s的传输速率。结果表明,在1 MHz-10 MHz频带内利用中国低压电网实现高速数据的传输是完全可行的。

This paper presents the essential basics for the design of reliable high speed PLC system. First a channel model for low voltage networks in the frequency range (1 MHz-10 MHz) is given with an exponential function model for background noise and a third-order statistical autoregressive model for frequency response. The channel capacity in two environments is calculated using the algorithm for the input power optimal distribution of the information theory, that is, 110 Mbit/s and 170 Mbit/s, respectively. A data transmitting rate of about 100 Mbit/s for an OFDM system can be reached with a symbol error rate of 10-6. It is shown that it is feasible to realize high-speed data transmission using low voltage networks of China.