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| Citation: | WANG Xiangrong, YU Shuotong, ZHAI Weitong, et al. Partially connected hybrid precoder design for wideband near-field integrated sensing and communications[J]. Journal of Radars, 2025, 14(4): 809–828. doi: 10.12000/JR25023
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Partially Connected Hybrid Precoder Design for Wideband Near-field Integrated Sensing and Communications
DOI: 10.12000/JR25023 CSTR: 32380.14.JR25023
More Information-
Abstract
Aiming to enhance sensing resolution and improve spectral efficiency, future Integrated Sensing And Communications (ISAC) systems are expected to incorporate extremely large-scale (XL) arrays and large bandwidths centered around high carrier frequencies. This design necessitates considering wideband and near-field effects. In this paper, the design of partially connected hybrid precoders for ISAC is refined and evaluated, focusing on the wideband near-field scenario and addressing monostatic and bistatic co-located Multiple-Input-Multiple-Output (MIMO). For monostatic MIMO, the Cramer-Rao Bound (CRB) for joint Direction-of-Arrival (DOA) and distance estimations of sensing wideband sources is rederived, serving as a performance metric for sensing. For bistatic MIMO, power irradiated at near-field targets is maximized while ensuring that the communication Quality of Service (QoS) for each user is maintained. To address the above nonconvex, high-dimensional problems, a direct alternative minimization, along with an indirect fully digital approximation, is proposed. This method decomposes the original problems into distinct subproblems, enabling effective solutions for each subproblem. Simulation results demonstrate that the proposed wideband near-field ISAC framework can achieve sensing and communication performance close to that of fully digital precoders, given an appropriate communication Signal-to-Noise Ratio (SNR) setting and transmit antenna grouping. -
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References
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- Figure 1. Schematic diagram of wideband near-field ISAC system
- Figure 2. Schematic diagrams of wideband near-field communication
- Figure 3. Schematic diagram of partially-connected hybrid precoder
- Figure 4. Two working modes of co-located MIMO
- Figure 5. The convergence curves of fully digital approximation algorithm for monostatic ISAC design
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Figure 6. MSE for angle and distance estimation versus
$ {\gamma }_{0} $ -
Figure 7. Transmit beampattern of the BS array (
$ {\gamma }_{0}=15\;{\mathrm{dB }}$ -
Figure 8. Output SNR versus
$ {\gamma }_{0} $ - Figure 9. The convergence curves of alternative minimization algorithm for bistatic ISAC design
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Figure 10. Power irradiated on each target versus
$ {\gamma }_{0} $ - Figure 11. Power irradiated on each target versus relative positions of multi-targets
- Figure 12. Power irradiated on each target versus relative positions of multi-users
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Figure 13. Transmit beampattern of the BS array (
$ {\gamma }_{0}=16\;\mathrm{d}\mathrm{B} $ -
Figure 14. Transmit beampattern of the BS array (
$ {\gamma }_{0}=17\;\mathrm{d}\mathrm{B} $ -
Figure 15. Transmit beampattern of the BS array (
$ {\gamma }_{0}=18\;\mathrm{d}\mathrm{B} $