STARS Enabled Integrated Sensing and Communications
نویسندگان
چکیده
A simultaneously transmitting and reflecting intelligent surface (STARS) enabled integrated sensing communications (ISAC) framework is proposed, where the whole space divided by STARS into a communication space. novel sensing-at-STARS structure, dedicated sensors are installed at STARS, proposed to address significant path loss clutter interference for sensing. The Cramer-Rao bound (CRB) of 2-dimension (2D) direction-of-arrivals (DOAs) estimation target derived, which then minimized subject minimum requirement. approach transform complicated CRB minimization problem trackable modified Fisher information matrix (FIM) optimization problem. Both independent coupled phase-shift models investigated: 1) For model, coupling ISAC waveform coefficient in FIM, an efficient double-loop iterative algorithm based on penalty dual decomposition (PDD) conceived; 2) PDD framework, low complexity alternating tackle constants alternatively optimizing amplitude coefficients closed-form. Finally, numerical results demonstrate that: significantly outperforms conventional RIS under constraints; model achieves comparable performance one requirements or sufficient elements; 3) It more increase number passive elements rather than active sensor; 4) High accuracy can be achieved using practical 2D maximum likelihood estimator compared with RIS.
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ژورنال
عنوان ژورنال: IEEE Transactions on Wireless Communications
سال: 2023
ISSN: ['1536-1276', '1558-2248']
DOI: https://doi.org/10.1109/twc.2023.3245297