A near-field ISAC-NOMA system communication security optimization method and system
By optimizing the base station transmit covariance matrix and beamforming of the near-field ISAC-NOMA system, the problem of the security of legitimate user information in the integrated communication and sensing system is solved, thereby maximizing the confidentiality rate and enhancing communication security.
CN120857103BActive Publication Date: 2026-05-05HUBEI POLYTECHNIC UNIV
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Patent Information
- Application Number
- CN202510021691.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2026-05-05
- Estimated Expiration
- 2045-01-07
AI Technical Summary
Technical Problem
In a sensor-integrated system, when NOMA technology is used by multiple legitimate users to share the same resource block, the security of information is threatened.
Method used
By optimizing the transmit covariance matrix of the base station in the near-field ISAC-NOMA system, combining the objective function of maximizing the confidentiality rate at legitimate users, and adding CRB constraints, the beamforming of the signal is optimized to enhance the signal of legitimate users and suppress eavesdroppers.
Benefits of technology
Strengthening signals at legitimate users can suppress eavesdroppers, improve communication security, and maximize confidentiality.
✦ Generated by Eureka AI based on patent content.
Abstract
This invention provides a method and system for optimizing communication security in a near-field ISAC-NOMA system. The near-field ISAC-NOMA system includes a base station, a sensing target, several legitimate users, and an eavesdropper. The method includes the following steps: S1: Obtaining the security rate at the legitimate user location in the near-field ISAC-NOMA system, where the security rate includes the covariance matrix of the base station's transmitted signal; S2: Constructing an objective function based on maximizing the security rate, and adding a CRB constraint to the objective function; S3: Solving the objective function to optimize the covariance matrix of the base station's transmitted signal. This scheme utilizes the characteristic of near-field systems that can combine angle and distance, achieving maximum security by optimizing the transmitted covariance matrix at the base station (BS) and limiting the CRB boundary of the sensing target. Specifically, in terms of beamforming, it achieves signal enhancement at the legitimate user location and suppression at the eavesdropper location, thereby enhancing communication security.
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