A satellite semantic relay forwarding method and system based on link difference degree

Abstract

The application provides a satellite semantic relay forwarding method and system based on link difference degree, and belongs to the technical field of multi-hop inter-satellite semantic communication and satellite relay forwarding. The method comprises the following steps: S1, constructing an inter-satellite semantic relay transmission system and defining basic assumptions; S2, establishing a single-hop semantic transmission model; S3, constructing a link difference degree measurement model; S4, designing a forwarding mode decision mechanism; S5, realizing forwarding mode execution and side information / mask reliable transmission. The application aims at the problems of conditional mismatch and end-to-end semantic / reconstruction quality fluctuation caused by the difference in channel conditions of adjacent two-hop links, constructs a calculable link difference measurement, adopts semantic direct forwarding when the link is approximately matched and the availability is sufficient to reduce the on-board computing power occupation and processing delay; switches to decoding-recoding regeneration when the link is mismatched or the constraints are not satisfied to stabilize the quality; and through the reliable transmission of the control plane mask / side information, decoding failure caused by mask mismatch or loss is avoided.

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