Physical-Layer Network Coding in 6G Enabled Marine Internet of Things

The ocean is a treasure trove of human resources, a blue gem on the earth, and a battlefield where soldiers meet. With the continuous advancement of science and technology, informationalized and modern marine research and the rational development of marine resources have attracted the attention of countries all over the world. Marine development must be accompanied by operations such as acquisition, transmission and processing of marine information. The Marine Internet of Things is the main carrier of ocean information acquisition and transmission, and also an important part of the integrated sky, ground and sea network explicitly involved in the 6G communication network. The underwater transmission of 6G Marine Internet of Things partly adopts underwater acoustic communication. The biggest problem facing underwater acoustic communication is the strong interference and strong fading of underwater acoustic channels. Considering the complexity of underwater acoustic communication environment and the asymmetry of channels, asymmetric two-way relay underwater acoustic communication system model is set up based on the ray model. In order to solve the link asymmetric problems in shallow underwater acoustic communication, a physical-layer network coding scheme based on asymmetric modulation is proposed.