Multi-frequency PLC Networking Technology Based on Preamble Sequence

Power Line Communication (PLC) network uses the existing grid as communication bracing. The low-voltage power distribution network is the most widespread network. In the low-voltage power distribution network, the communication distance is very short, which provides the possibility to achieve the narrow band and high-speed power line communication. But, its network structure is complex, and the link length, load and network branch of different locations is different. The attenuation of PLC network channel exhibits frequency-selective. In addition, the noise exhibits the frequency selective, too. Therefore, it is difficult to find a frequency to implement communication between the master and the majority of the slave stations. Thus, we propose multifrequency networking technology based on preamble sequence. This technology can reduce the number of hops of the communication between the master and the slaves. Thereby, the delay of the network will reduce, and the network throughput will increase. Meanwhile, the station can quickly adapt to the change of the communication environment and service needs.