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The 1D near-field codebook design for an interval (a0, aK+1] on the boresight, with K +1 centers {b1, b2, · · · , bK+1}

The 1D near-field codebook design for an interval (a0, aK+1] on the boresight, with K +1 centers {b1, b2, · · · , bK+1}

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Fig. 1: An illustration of the LIS transmission under a LoS scenario....
Fig. 3: An illustration of the proof for Theorem 1, where the distance...
Fig. 4: The 1D near-field codebook design for an interval (a0, aK+1] on...
Fig. 6: Beam-patterns of the derived 1D near-field beam and a...
+5 Fig. 7: Array gains for a UE in two different cases and with different...
Design of Near-Field Beamforming for Large Intelligent Surfaces
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  • Jul 2022
p> In this paper, we propose a novel near-field beamforming (BF) design for a Large Intelligent Surface (LIS) implemented as a discretized two-dimensional (2D) antenna array. We firstly investigate the definitions of near-field and far-field regions of the LIS, and determine the Fraunhofer distance which scales up linearly in the surface-area. Then...
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... given values of a 0 and a K+1 , respectively, which is illustrated in Fig. 4, where for a UE located on the boresight of the LIS (after the far-field BF), the optimal near-field BF can be set to e jθ k m(m−M −1) and e jθ k n(n−N −1) for each dimension in Property ...

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Fig. 1: An illustration of the LIS transmission with two cases: a UE is...
Fig. 2: The near-field and far-field regions of a LIS-array with...
Fig. 3: An illustration of Theorem 1, where the distance dmn between UE...
Fig. 5: Antenna-elements on circles have identical phase variations...
+2 Fig. 6: Beam-patterns of the 1D near-field beam and a DFT beam with of...
Design of Near-Field Beamforming for Large Intelligent Surfaces
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Full-text available
  • Mar 2023
p>In this paper, we propose a novel three-dimensional (3D) near-field beamforming (BF) design for Large Intelligent Surface (LIS). We firstly investigate the definitions of near-field and far-field of LIS, and derive the Fresnel near-field region where amplitudes variations are negligible and only phase variations worsen the harvested array-gains....
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