期刊
SENSORS
卷 22, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/s22114013
关键词
power line communication; narrowband interference; preamble; synchronization; smart grid
资金
- Academician Expert Open Fund of Beijing Smartchip Microelectronics Technology Co., Ltd.
- National Natural Science Foundation of China [61901403]
- Science and Technology Key Project of Fujian Province, China [2019HZ020009]
- Youth Innovation Fund of Natural Science Foundation of Xiamen [3502Z20206039]
- Xiamen Special Fund for Marine and Fishery Development [21CZB011HJ02]
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. The proposed method is capable of improving the synchronization performance significantly by combating against NBI contamination and transmitting transmission parameter signaling (TPS) simultaneously.
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.
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