This paper investigates the secure transmission in a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted uplink non-orthogonal multiple access system, where the legitimate users send confidential signals to the base station by exploiting STAR-RIS to reconfigure the electromagnetic propagation environment proactively. Depending on the availability of the eavesdropping channel state information (CSI), both the full CSI and statistical CSI of the eavesdropper are considered. For the full eavesdropping CSI scenario, we adopt the adaptive-rate wiretap code scheme with the aim of maximizing minimum secrecy capacity subject to the successive interference cancellation decoding order constraints. To proceed, we propose an alternating hybrid beamforming (AHB) algorithm to jointly optimize the receive beamforming, transmit power, and reflection/transmission coefficients. While for the statistical eavesdropping CSI scenario, the constant-rate wiretap code scheme is employed to minimize the maximum secrecy outage probability (SOP) subject to the quality-of-service requirements of legitimate users. Then, we derive the exact SOP expression under the constant-rate coding strategy and develop an extended AHB algorithm for the joint secrecy beamforming design. Simulation results demonstrate the effectiveness of the proposed scheme. Moreover, some useful guidance about the quantification of phase shift/amplitude and the deployment of STAR-RIS is provided.

翻译：本文在同时传输并反映可重新配置的智能表面(STAR-RIS)中调查安全传输情况,协助将非正反调多重访问系统连接起来,合法用户通过利用STAR-RIS主动重新配置电磁传播环境,向基地站发送保密信号。视窃听频道状态信息(CSI)的可用性而定,对窃听器的完整 CSI 和统计 CSI 都予以考虑。对于全面窃听 CSI 情景,我们采用了适应率窃听代码计划,目的是在连续取消干扰、解码命令限制的情况下最大限度地实现最低保密能力。接下来,我们建议采用交替混合波形(AHB)算法,共同优化接收波形、传输权力和反射/传输系数。对于CiveSSI假想的统计缩放情景,则采用恒定比率窃听代码计划,以最大限度地减少最大保密率(SOP),但须符合合法用户的高质量服务要求。我们建议采用交替混合波束(AHB)的算法,然后根据SOP-RODS-Asmaimal devely sal sal laveal slade slade slap sal slade lade slade slade slade slade slaveal laveal lade laveal laveal laveal laveal lade lade lade lade lade lade ladal ladal ladal ladal ladal ladal 计划,我们 和Sil 和Slade