Fluid Antenna Index Modulation for MIMO Systems: Robust Transmission and Low-Complexity Detection
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909443341418496 |
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| author | Guo, Xinghao Xu, Yin He, Dazhi Zhang, Cixiao Hong, Hanjiang Wong, Kai-Kit Zhang, Wenjun Wu, Yiyan |
| author_facet | Guo, Xinghao Xu, Yin He, Dazhi Zhang, Cixiao Hong, Hanjiang Wong, Kai-Kit Zhang, Wenjun Wu, Yiyan |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_04877 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fluid Antenna Index Modulation for MIMO Systems: Robust Transmission and Low-Complexity Detection Guo, Xinghao Xu, Yin He, Dazhi Zhang, Cixiao Hong, Hanjiang Wong, Kai-Kit Zhang, Wenjun Wu, Yiyan Information Theory Signal Processing 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. |
| title | Fluid Antenna Index Modulation for MIMO Systems: Robust Transmission and Low-Complexity Detection |
| topic | Information Theory Signal Processing |
| url | https://arxiv.org/abs/2412.04877 |