2 results about "Physical layer network coding" patented technology

The application discloses a key default security information exchange method, system, device and medium based on physical layer network coding and block chain in Internet of Vehicles, and the method comprises the following steps: constructing a block chain network; registering an on-board unit (OBU); initiating a data exchange request; authenticating the OBU; and exchanging data. The system, device and medium are used for realizing the key default security information exchange method based on physical layer network coding and block chain in Internet of Vehicles. The block chain technology is applied to identity authentication of Internet of Vehicles, and the data exchange between OBUs is carried out by using physical layer network coding, so that the security and confidentiality are high, and the eavesdropping attack and privacy leakage can be prevented at the same time.

The invention relates to the technical field of data processing, in particular to an on-satellite remote sensing data task-oriented cross attention fusion compression wireless transmission method, which comprises the following steps that: an intelligent agent takes metadata and channel state information as a state space and takes a parameter adjustment strategy of a cross attention mechanism as an action space; the output decision dynamically adjusts the interaction degree of different modal original data stream features, and the adjusted features are compressed to generate a compressed data stream; a compressed data stream is input into a wireless transmission digital twinborn model constructed on a satellite, a carrier sensing multi-channel access protocol is adopted in an actual transmission stage, and the size of a protocol backoff window is dynamically adjusted by the digital twinborn model according to a rehearsal conflict probability and is optimized by combining a channel capacity change trend prediction result. And finally sending the composite signal of the physical layer network coding. According to the invention, through task-oriented data processing, intelligent compression and digital twinborn rehearsal, the spectrum competition conflict of satellite multi-modal data concurrent transmission is solved.