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arXiv 2412.04877cs.ITeess.SPmath.IT
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面向MIMO系统的流体天线索引调制:鲁棒传输与低复杂度检测

Fluid Antenna Index Modulation for MIMO Systems: Robust Transmission and Low-Complexity Detection

Xinghao Guo, Yin Xu, Dazhi He, Cixiao Zhang, Hanjiang Hong, Kai-Kit Wong, Wenjun Zhang, Yiyan Wu

AI总结:

本文针对流体天线索引调制MIMO系统在高空间相关性下性能下降的问题,提出基于分组索引调制的FAG-IM方案和结构化近似消息传递检测器,实现鲁棒传输与线性复杂度检测。

摘要:

基于流体天线(FA)索引调制(IM)的多输入多输出(MIMO)系统,称为FA-IM,与传统FA辅助MIMO系统相比显著提升了频谱效率(SE)。为提高对流体天线多个激活端口之间高空间相关性的鲁棒性,本文提出了一种创新的基于FA分组的IM(FAG-IM)系统。基于空间相关性模型和端口分布结构,采用分组方案。然后,推导了FAG-IM系统平均误码概率(ABEP)上界的闭式表达式。为降低接收机复杂度,将消息传递架构引入FAG-IM系统。在此基础上,利用发射信号的结构特性,提出了一种高效的近似消息传递(AMP)检测器,称为结构化AMP(S-AMP)检测器。仿真结果证实,所提出的FAG-IM系统在存在空间相关性的情况下显著优于现有FA-IM系统,实现了更鲁棒的传输。此外,结果表明,所提出的低复杂度S-AMP检测器不仅将时间复杂度降低到线性规模,而且与最小均方误差(MMSE)检测器相比,大幅提升了误码率(BER)性能,从而增强了FAG-IM系统的实际可行性。

英文摘要:

The fluid antenna (FA) index modulation (IM)-enabled multiple-input multiple-output (MIMO) system, referred to as FA-IM, significantly enhances spectral efficiency (SE) compared to the conventional FA-assisted MIMO system. To improve robustness against the high spatial correlation among multiple activated ports of the fluid antenna, this paper proposes an innovative FA grouping-based IM (FAG-IM) system. A block grouping scheme is employed based on the spatial correlation model and the distribution structure of the ports. Then, a closed-form expression for the average bit error probability (ABEP) upper bound of the FAG-IM system is derived. To reduce the complexity of the receiver, the message passing architecture is incorporated into the FAG-IM system. Building on this, an efficient approximate message passing (AMP) detector, named structured AMP (S-AMP) detector, is proposed by exploiting the structural characteristics of the transmitted signals. Simulation results confirm that the proposed FAG-IM system significantly outperforms the existing FA-IM system in the presence of spatial correlation, achieving more robust transmission. Furthermore, it is demonstrated that the proposed low-complexity S-AMP detector not only reduces time complexity to a linear scale but also substantially improves bit error rate (BER) performance compared to the minimum mean square error (MMSE) detector, thereby enhancing the practical feasibility of the FAG-IM system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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