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

Claim 6:
7. A multiple access system, comprising a base station and a plurality of user equipment (UEs), wherein,
each of the plurality of UEs comprises:
a first obtaining module, configured to obtain first source information;
a semantic feature extracting module, configured to exact a semantic feature of the first source information to obtain a first semantic feature sequence;
a joint source-channel coding module, configured to perform a joint source-channel coding on the first semantic feature sequence to obtain a first semantic information sequence;
a time-frequency resource mapping module, configured to map the first semantic information sequence into preset time-frequency resources; and
a transmission module, configured to transmit the first semantic information sequence through an uplink multiple access channel;
the base station comprises:
a second obtaining module, configured to obtain 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
a reconstructing module, configured to for each of the plurality of UEs, obtain first reconstructed source information corresponding to the UE according to the first superposition semantic information sequence;
wherein the joint source-channel coding module is further configured to:
transform the first semantic feature sequence to obtain a first side information sequence;
estimate probability information of the first semantic feature sequence based on the first side information sequence to obtain a first probability information sequence;
obtain a first channel input symbol dimension sequence according to the first probability information sequence; and
perform 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 the reconstructing module is further configured to:
transform, for each of the plurality of UEs, the first side information sequence of the UE to obtain a first reconstructed probability information sequence;
obtain a first reconstructed channel input symbol dimension sequence according to the first reconstructed probability information sequence;
obtain 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
obtain the first reconstructed source information according to the first reconstructed semantic feature sequence.