Adaptive Network Coding Algorithm for LEO Satellite Networks

Small satellite networks (SSNs) are playing an increasingly critical role in the communication system because of their wide application, high performance and low cost. However, due to the complex satellite network environment, the wireless channel is often affected by electromagnetic interference and communication distance, which makes the lossy characteristics of the satellite wireless channel more serious. Meanwhile, the topology of the satellite network is in dynamic change due to the high-speed movement of satellites, making the inter-satellite link extremely unstable, and link interruptions occur from time to time, which brings great challenges to satellite communication. To solve the above challenges, this paper designs an Adaptive Network Coding algorithm(ANC) that adaptively adjusts the redundancy according to the link quality and applies the Cauchy matrix to the encoding of data packets. An intermediate node can be used to retransmit coded packets in a feedback-based hop-by-hop method. The experimental results show that ANC effectively reduces the transmission delay.