车载MU-MISO系统跨域NOMA-OTFS方案联合优化设计

IF 3.2 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Aeu-International Journal of Electronics and Communications Pub Date : 2025-07-29 DOI:10.1016/j.aeue.2025.155956

Hao Xu , Zhiquan Bai , Heng Wang , Runlai Wang , Pengwei Wang , Hongwu Liu , Guimin Su

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引用次数: 0

摘要

正交时频空间（OTFS）调制和非正交多址（NOMA）在具有高多普勒频移、快速时变信道和多用户环境的车载网络中具有显著优势。提出了车载多用户多输入单输出（MU-MISO）系统中跨域NOMA-OTFS方案的联合优化设计，利用频域线性均衡器（FD-LE）减轻延迟-多普勒（DD）域的码间干扰（ISI），利用连续干扰抵消（SIC）消除多用户干扰（MUI）。在高速用户服务质量（QoS）约束下，提出了以系统和速率最大化为目标的联合基站（BS）波束形成和功率分配优化问题，提出了针对多用户协调的通用波束形成（CBF）优化和针对差异化用户服务的用户特定波束形成（USBF）设计。提出了一种基于分数规划（FP）和半定松弛（SDR）的低复杂度优化算法，并针对USBF提出了一种基于连续凸逼近（SCA）和半定松弛（SDR）的鲁棒优化方法。仿真结果表明，所提方案显著提高了系统和速率，USBF方案在低相关信道和高QoS情况下优于CBF方案，而CBF方法在高密度、多径和多普勒丰富环境下具有更好的鲁棒性。

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Joint optimization design of cross-domain NOMA-OTFS scheme in vehicular MU-MISO system

Orthogonal time-frequency space (OTFS) modulation and non-orthogonal multiple access (NOMA) offer significant advantages in vehicular networks with high Doppler shift, rapid time-varying channels, and multi-user environments. This paper proposes the joint optimization design of cross-domain NOMA-OTFS scheme in vehicular multi-user multiple-input single-output (MU-MISO) system, utilizing a frequency domain linear equalizer (FD-LE) to mitigate the inter-symbol interference (ISI) in the delay-Doppler (DD) domain and a successive interference cancellation (SIC) to eliminate the multi-user interference (MUI). Under the quality of service (QoS) constraints for high-speed users, a joint base station (BS) beamforming and power allocation optimization problem is formulated to maximize the system sum rate and we propose a common beamforming (CBF) optimization for multi-user coordination and a user-specific beamforming (USBF) design for differentiated user services. A low-complexity algorithm based on fractional programming (FP) and semidefinite relaxation (SDR) is proposed for CBF, while a robust optimization approach with successive convex approximation (SCA) and SDR is developed for USBF. Simulation results show that the proposed schemes significantly enhance the system sum rate and the USBF scheme outperforms the CBF scheme in low-correlation channels and high QoS cases, while the CBF method exhibits better robustness in high-density, multipath, and Doppler-rich environments.

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来源期刊

Aeu-International Journal of Electronics and Communications 工程技术-电信学

CiteScore

6.90

自引率

18.80%

发文量

292

审稿时长

4.9 months

期刊介绍： AEÜ is an international scientific journal which publishes both original works and invited tutorials. The journal''s scope covers all aspects of theory and design of circuits, systems and devices for electronics, signal processing, and communication, including: signal and system theory, digital signal processing network theory and circuit design information theory, communication theory and techniques, modulation, source and channel coding switching theory and techniques, communication protocols optical communications microwave theory and techniques, radar, sonar antennas, wave propagation AEÜ publishes full papers and letters with very short turn around time but a high standard review process. Review cycles are typically finished within twelve weeks by application of modern electronic communication facilities.