Multiple Access Transmission Strategy And Performance Analysis In Power Line Communication Systems

Compared with traditional communication methods,Power Line Communication(PLC)can achieve data transmission only through the existing power line network in buildings,and is considered to be one of the effective ways to solve the "last mile" problem of the power Internet of Things.However,PLC has problems such as low transmission rates and inability to achieve mobile access for terminals,which makes it difficult to meet the demands of the rapid growth of future power grid communication services.Therefore,this paper studied the multiple access strategies of power line and wireless hybrid communication systems in several typical scenarios,and analyzed their performance to provide theoretical basis for further exploration of the practical application of hybrid systems.The main contents of this paper are as follows:1.For a PLC-visible light communication(VLC)hybrid transmission system under the decode and forward(DF)protocol,a dynamic decoding-based non-orthogonal multiple access(NOMA)scheme is being proposed The closed-form expression of the interruption probability of the system is being analyzed.Finally,computer simulations are being used to verify the correctness of the theoretical analysis and to analyze the impact of different heights,maximum irradiation angles,and power allocation coefficients on the interruption performance of the system.2.For a VLC-PLC hybrid communication system using NOMA technology with DF protocol for the VLC link,a semi-grant-free(SGF)transmission schemes based on Distributed Contention Control(DCC)is proposed.The closed-form expressions for interruption probability of both Grant-Based Users(GBU)and Grant-Free Users(GFU)were derived under this scheme.Computer simulations not only validated the theoretical analysis,but also provided analysis of the impact of typical parameters.3.For an indoor PLC-VLC/RF hybrid transmission system under the DF protocol,two transmission schemes based on Maximal Ratio Combining(MRC)and Selection Combining(SC)are being proposed.The closed-form expression of the interruption probability of the system is being derived for both schemes.Computer simulations are being used to verify the correctness of the theoretical analysis and to analyze the impact of typical parameters on the interruption performance of the system.