Patent ID: 11895629
Assignee: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A multiple access method based on a semantic domain, implemented by a multi-user transmission system, the multi-user transmission system comprising a base station and a plurality of user equipment (UEs), the method comprising:
obtaining, by a UE, first source information;
extracting, by the UE, a semantic feature of the first source information to obtain a first semantic feature sequence;
performing, by the UE, a joint source-channel coding on the first semantic feature sequence to obtain a first semantic information sequence;
mapping, by the UE, the first semantic information sequence into preset time-frequency resources; and
transmitting, by the UE, the first semantic information sequence through an uplink multiple access channel;
obtaining, by the base station, a first superposition semantic information sequence of a plurality of the first semantic information sequences of the plurality of UEs of the multi-user transmission system from the uplink multiple access channel; wherein the first superposition semantic information sequence represents a superposition of the plurality of the first semantic information sequences of the plurality of UEs of the multi-user transmission system; and
for each of the plurality of UEs, obtaining, by the base station, first reconstructed source information corresponding to the UE according to the first superposition semantic information sequence;
wherein performing, by the UE, a joint source-channel coding on the first semantic feature sequence to obtain a first semantic information sequence comprises:
transforming, by the UE, the first semantic feature sequence to obtain a first side information sequence;
estimating probability information of the first semantic feature sequence based on the first side information sequence to obtain a first probability information sequence;
obtaining a first channel input symbol dimension sequence according to the first probability information sequence; and
performing the joint source-channel coding on the first semantic feature sequence on the basis of the first channel input symbol dimension sequence to obtain the first semantic information sequence; and
wherein obtaining, by the base station, first reconstructed source information according to the first superposition semantic information sequence for each of the plurality of UEs comprises:
for each of the plurality of UEs,
transforming, by the base station, the first side information sequence of the UE to obtain a first reconstructed probability information sequence;
obtaining a first reconstructed channel input symbol dimension sequence according to the first reconstructed probability information sequence;
obtaining a first reconstructed semantic feature sequence through a joint source-channel decoding according to the first reconstructed channel input symbol dimension sequence and the first superposition semantic information sequence; and
obtaining the first reconstructed source information according to the first reconstructed semantic feature sequence.