Reconfigurable Intelligent Surface Assisted Secure Symbiotic Radio Multicast Communications
- Publisher:
- IEEE
- Publication Type:
- Conference Proceeding
- Citation:
- 2022 IEEE 96th Vehicular Technology Conference (VTC2022-Fall), 2023, 2022-September, pp. 1-6
- Issue Date:
- 2023-01-18
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| Reconfigurable Intelligent Surface Assisted Secure Symbiotic Radio Multicast Communications.pdf | Accepted version | 277.39 kB |
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In this paper we propose a reconfigurable intelligent surface RIS assisted secure transmission scheme for a symbiotic radio multicast system where the RIS not only assists the confidential information multicasting from a primary transmitter PT to multiple primary users PUs to against the information interception by eavesdroppers but also delivers its own signal to a secondary user SU by passive reflections We formulate a signal to noise ratio SNR maximization problem for the SU by jointly optimizing the active beamforming at the PT amplitude reflection coefficients and phase shifts of the RIS To address the non convexity of the formulated problem we propose to decompose the original problem into two sub problems and solve them independently in an iteratively alternating manner For the first sub problem we adopt the successive convex approximation SCA and semidefinite relaxation SDR techniques to design the active beamforming by proving the tightness of SDR For the second sub problem the sequential rank one constraint relaxation SROCR technique is adopted to handle the rank one constraint for reflection coefficients optimization Numerical results show that compared to the benchmark schemes the proposed scheme can achieve up to 68 3 performance gain in terms of SNR
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