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<p>This paper discussed a frequency-dependent distributed beamforming technique to improve the reliability in implant multiple-input multiple-output (MIMO)-ultra wideband (UWB) communications. To realize distributed beamforming for implant MIMO-UWB systems, we propose an optimization method to theoretically determine the weight coefficients optimized for the implant UWB communication. To evaluate the performance improvement, the propagation characteristics of the implant channel in the low band UWB (3.4–4.8&#xa0;GHz) were analyzed by the finite difference time domain (FDTD) method with a numerical human model. Subsequently, this study conducted computer simulations based on the derived propagation channel model. The evaluation results demonstrate that the proposed beamforming effectively improved the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(E_b/N_0\)</EquationSource> </InlineEquation> performance by 5&#xa0;dB in a capsule endoscopy scenario, compared to the conventional method, which can improve implantable medical devices in the future.</p>

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Weight optimization of MIMO-UWB distributed beamforming for implant communications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月21日

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  • Takumi Kobayashi,
  • Jaakko Hyry,
  • Manato Fujimoto,
  • Daisuke Anzai

摘要

This paper discussed a frequency-dependent distributed beamforming technique to improve the reliability in implant multiple-input multiple-output (MIMO)-ultra wideband (UWB) communications. To realize distributed beamforming for implant MIMO-UWB systems, we propose an optimization method to theoretically determine the weight coefficients optimized for the implant UWB communication. To evaluate the performance improvement, the propagation characteristics of the implant channel in the low band UWB (3.4–4.8 GHz) were analyzed by the finite difference time domain (FDTD) method with a numerical human model. Subsequently, this study conducted computer simulations based on the derived propagation channel model. The evaluation results demonstrate that the proposed beamforming effectively improved the \(E_b/N_0\) performance by 5 dB in a capsule endoscopy scenario, compared to the conventional method, which can improve implantable medical devices in the future.