Abstract
In this paper, we propose a rate-splitting design and characterize the sum-degrees-of-freedom (DoF) for the K-user multiple-input-single-output (MISO) broadcast channel with mixed channel state information at the transmitter (CSIT) and order-(K - 1) messages, where mixed CSIT refers to the delayed and imperfect-current CSIT, and order-(K - 1) message refers to the message desired by K - 1 users simultaneously. In particular, for the sum-DoF lower bound, we propose a rate-splitting scheme embedding with retrospective interference alignment. In addition, we propose a matching sum-DoF upper bound via genie signalings and extremal inequality. Opposed to existing works for K = 2, our results show that the sum-DoF is saturated with CSIT quality when CSIT quality thresholds are satisfied for K > 2.
| Original language | English |
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| Title of host publication | 2023 IEEE 98th Vehicular Technology Conference, VTC 2023-Fall : Proceedings |
| Publisher | IEEE |
| ISBN (Electronic) | 9798350329285 |
| DOIs | |
| Publication status | Published - 2023 |
| Externally published | Yes |
| Event | 98th IEEE Vehicular Technology Conference, VTC 2023-Fall - Hong Kong, China Duration: 10 Oct 2023 → 13 Oct 2023 |
Publication series
| Name | IEEE Vehicular Technology Conference |
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| ISSN (Print) | 1550-2252 |
Conference
| Conference | 98th IEEE Vehicular Technology Conference, VTC 2023-Fall |
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| Country/Territory | China |
| City | Hong Kong |
| Period | 10/10/23 → 13/10/23 |
Bibliographical note
Publisher Copyright:© 2023 IEEE.
Funding
This work was supported by the National Natural Science Foundation of China under Grant 62171213, the Shenzhen Science and Technology Program under Grant RCBS20200714114956153, and Fundamental Research Funds for the Central Universities under Grant 11623336.