Research On Access Technology And Caching Strategy Of Power Line Communication Network

Power line communication,with low cost on the network realization and wide range on network coverage,is one of the important communication technologies in the smart grid.It has wide applications in providing narrowband and broadband communication services.However,the rapid development of smart grid and the need for high-quality information transmission pose new challenges for power line communication.To achieve fast network access,low energy consumption and redundant data transmission alleviation,this thesis studies the access technology and cache strategies in power line communication networks based on the network structure and channel characteristics of power line communication.Overall,the contributions can be summarized as follows.(1)For the problem of the modulation recognition during the power line communication network access,a centralized modulation recognition method in cooperative way is proposed.The system with multiple input and multiple output(MIMO)structures is established,the fourth-order cumulant is extracted as the identification feature,and a cooperative modulation recognition algorithm based on weighting factor is designed.The simulation results show that the algorithm has an efficient and accurate recognition performance.(2)For the problem of mass redundant data transmission over the backhaul link,a cache model suitable for power line communication network is proposed.A selection algorithm is designed to pick the cache nodes.The node influence determined by the request relationship is adopted as the selection basis.The simulation results show that the proposed algorithm has good performance in meeting system cache requirements and saving cache resources.(3)A file placement model over the cache-enabled system is established to place the file into cache reasonably.The optimal placement scheme is solved by minimizing the backhaul energy consumption.The Lagrangian relaxation method is used to approximate the problem,and an optimal file placement algorithm is designed for solution.The simulation results show that the overall performance of the placement based on the proposed algorithm is optimal.Finally,summarizes this thesis and discussed the follow-up research.