Liu Sicong, Yang Fang, Li Dejian, Yao Ruilong, Song Jian
Department of Information and Communication Engineering, School of Informatics, Xiamen University, Xiamen 361005, China.
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China.
Sensors (Basel). 2022 May 25;22(11):4013. doi: 10.3390/s22114013.
Power line communication (PLC) is an important interconnection technology for the smart grid, but the robustness of PLC transmission is faced with a great challenge due to strong non-Gaussian noise and interference. In this paper, a narrowband interference (NBI) resistant preamble is designed, and an effective timing and frequency synchronization method is proposed for OFDM-based PLC systems in the smart grid, which is capable of simultaneously conveying some bits of transmission parameter signaling (TPS) as well. In the time domain, the cyclic extension of the training OFDM symbol is scrambled, which makes it feasible to combat against NBI contamination. More accurate timing detection and sharper correlation peak can be implemented under the power line channel and the AWGN channel in the presence of NBI, compared with the conventional Schmidl's and Minn's methods with the same preamble length. Furthermore, the TPS transmitted using the proposed method is also immune from the NBI. The proposed method is capable of improving the synchronization performance of the PLC transmission significantly, which is verified by theoretical analysis and computer simulations.
电力线通信（PLC）是智能电网的一项重要互联技术，但由于存在强非高斯噪声和干扰，PLC传输的鲁棒性面临巨大挑战。本文设计了一种抗窄带干扰（NBI）的前导码，并针对智能电网中基于正交频分复用（OFDM）的PLC系统提出了一种有效的定时和频率同步方法，该方法还能够同时传输一些传输参数信令（TPS）比特。在时域中，训练OFDM符号的循环扩展被加扰，这使得对抗NBI污染成为可能。与具有相同前导码长度的传统施密德尔（Schmidl）方法和明（Minn）方法相比，在存在NBI的情况下，在电力线信道和加性高斯白噪声（AWGN）信道中都能实现更精确的定时检测和更尖锐的相关峰值。此外，使用所提方法传输的TPS也不受NBI影响。所提方法能够显著提高PLC传输的同步性能，这通过理论分析和计算机仿真得到了验证。
