Hybrid retransmission method based on semantic coding

Abstract

The invention discloses a hybrid retransmission method based on semantic coding. The method comprises the following steps: a main semantic codec and a plurality of incremental redundant semantic codec are trained for content to be transmitted; for a first type hybrid retransmission method, only one main semantic codec is used for replacing an original information source channel for coding and decoding, a sending end performs semantic coding and CRC check coding on an information source and sends the information source, a receiving end performs decoding and CRC check, and if errors exist, code words are discarded, and the sending end is notified to retransmit the same code words; for a second type hybrid retransmission method, the receiving end does not discard error code words after finding errors, the sending end is notified to continue to use an incremental redundancy semantic encoder to encode an information source and send the information source, and the receiving end combines all the received code words every time, uses the corresponding incremental redundancy semantic decoder to complete decoding and carries out CRC check. Compared with a hybrid retransmission method based on traditional forward coding, the invention has the advantages that the sending code length is greatly reduced, and the decoding performance of a hybrid retransmission mechanism in a long-term severe channel environment is improved.

Description

technical field [0001] The invention relates to a hybrid retransmission method based on semantic coding, which belongs to the technical field of wireless communication. Background technique [0002] In recent years, semantic autoencoder networks based on attention mechanism have been widely used in many disciplines such as natural language processing, and have continuously achieved breakthrough results. In the field of communication, semantic communication based on transmission content awareness is one of the current hot research directions, and it is expected to achieve a breakthrough in traditional communication from symbolic transmission to semantic transmission. [0003] For the hybrid retransmission technology, which is one of the key communication technologies, there are hybrid retransmission methods based on different forward error correction codes. However, the current error correction coding method only stays at encoding bit-level or symbol-level data, cannot under...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a hybrid retransmission method based on semantic coding, and solve the existing problems of the prior art that require high transmission bandwidth, cannot work in a long-term harsh channel environment, and cannot adapt to signal Problems with rapidly changing source and channel environments

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