Design and Optimization of Secure Transmission Scheme for Rate-Splitting Multiple Access System

LEI Weijia; XIE Ke; TANG Hong; LEI Hongjiang

doi:10.11999/JEIT240389

Volume 46 Issue 11

Nov. 2024

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LEI Weijia, XIE Ke, TANG Hong, LEI Hongjiang. Design and Optimization of Secure Transmission Scheme for Rate-Splitting Multiple Access System[J]. Journal of Electronics & Information Technology, 2024, 46(11): 4278-4286. doi: 10.11999/JEIT240389

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LEI Weijia, XIE Ke, TANG Hong, LEI Hongjiang. Design and Optimization of Secure Transmission Scheme for Rate-Splitting Multiple Access System[J]. Journal of Electronics & Information Technology, 2024, 46(11): 4278-4286. doi: 10.11999/JEIT240389

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Design and Optimization of Secure Transmission Scheme for Rate-Splitting Multiple Access System

doi: 10.11999/JEIT240389

1.
School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2.
Chongqing Key Laboratory of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Funds: The National Natural Science Foundation of China (61971080)

Received Date: 2024-05-17
Rev Recd Date: 2024-09-23

Available Online: 2024-09-27

Publish Date: 2024-11-10

Abstract

Abstract

The design and optimization issues of secure downlink transmission scheme for two users based on rate-splitting multiple access are studied. Considering a scenario where partial messages sent to two users need to be kept confidential between users, the sum rate of non-confidential messages is maximized while ensuring the transmission rate of confidential messages. The common stream only carries the non-confidential messages, while the private streams carry both the non-confidential and confidential messages in a time-sharing manner. Transmit precoding vectors for each message flow, rate splitting, transmission time allocation for the private streams of non-confidential and confidential messages are jointly optimized. By decomposing the original problem into a two-level optimization problem and using methods such as binary search, relaxation variables, and successive convex approximation, the original problem is transformed and solved. The simulation results show that the proposed scheme can achieve higher non-confidential sum rate compared to the rate-splitting multiple access, where the private streams carry only the confidential messages, and space division multiple access with time-sharing between non-confidential messages and confidential messages.
- Rate splitting,
- Multiple access,
- Physical layer security,
- Precoding

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References(15)

References

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