Research On Dynamic Subcarrier Dynamic Allocation Method For Power Line Communication

Power Line Communication(PLC)is a wired communication method that transmits signals such as data,voice,and images on the basis of a power line architecture.The main function of the power line is to transmit electrical energy.The power line channel has problems such as large impedance,rapid change,strong signal attenuation and multipath delay.Orthogonal Frequency Division Multiplexing(OFDM)can effectively resist the advantages of frequency selective fading,anti-multipath delay,high frequency band utilization,and fast transmission rate,which just makes up for the shortcomings of power line channels.Multi-input Multi-output Power Line Communication(MIMO-PLC)has the advantages of anti-PLC channel multipath fading,improved PLC reliability and channel capacity.Through spatial diversity technology and spatial multiplexing technology,MIMO technology can effectively improve the transmission rate of the system under the condition of constant bandwidth and power.In power line communication,MIMO technology is combined with OFDM technology to make up for the existence of power line communication.Insufficient,it can also improve the performance of the system.In OFDM modulation,since different subcarriers have different fading conditions when passing through a channel,if excellent transmission performance is desired,adaptive adjustment and allocation of subcarrier bits and power,that is,adaptive OFDM modulation,is required.In this paper,the research status of domestic and foreign research in the research field is fully investigated,analyzed,summarized and summarized.The research shows that traditional water injection algorithms and genetic algorithms have defects in subcarrier power allocation applications,while MIMO-OFDM research mostly focuses on wireless sub-areas and multi-input multi-output power line communication multi-user scenarios.Research is still rare.Based on this,the research is carried out to analyze the PLC channel attenuation model.Based on the model,the single-input single-output power line communication(SISO-PLC)dynamic sub-carrier allocation method and multi-input multi-output power line communication(Multi-input Multi-output Power Line Communication)are studied and analyzed.MIMO-PLC)Dynamic Subcarrier Allocation Method.The water injection algorithm and genetic algorithm are applied to the dynamic subcarrier allocation of single input and single output power lines,and the algorithm is optimized and improved.The adaptive bit power allocation algorithm is applied to the dynamic subcarrier allocation of multiple input and multiple output power lines to obtain better performance.