Modeling And Optimization Of Distributed Polarization On-body Relay Channel

Human body area communication is a short-range wireless communication technology that is carried out around the human body or inside the human body.In the application scenario of human body area communication,various communication devices may be located on the surface of the human body,inside the human body or in the vicinity of the human body,forming a wireless communication network for sharing data,reducing functional redundancy,and providing new services.As an emerging communication technology,human body regional communication plays a major role in health care and recreation.In order to achieve miniaturization of wireless communication nodes and continuous stability of communication performance,the wireless human body area communication mechanism with body surface relay communication as the core needs to adopt a suitable polarization direction in order to effectively capture the polarization component of the body surface propagation channel.This study is aimed at distributed polarization table relay communication,the main types of relay channels are dual-hop channel and extended three-hop channel.Distributed mainly refers to the establishment of multiple relay nodes belonging to the same level in the dual-hop channel,which is mainly for the purpose of screening the best relay location nodes in the later stage.The article analyzes the propagation characteristics of electromagnetic waves on the body surface and the common body surface channel model.The actual polarization on-body channel is measured and FDTD simulation is performed,by defining the three polarization directions of the monopole antenna relative to the human body surface.The polarization characteristics of on-body channel propagation are analyzed and summarized.These lay the foundation for the establishment of the distributed polarization table channel model.Based on the multi-hop decoding and forwarding scheme,this paper establishes a distributed polarization relay channel model and simulates its path loss model.Through the matrix singular value decomposition(SVD)and other related theories,the polarization on-body relay channel is optimized,the channel gain is improved,and on-body communication quality is guaranteed.