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- W4290996900 abstract "Terahertz (0.1-10 THz) communications are envisioned as a key technology for 6G ultra-high-speed wireless systems, by offering an ultra-broad bandwidth. Integrated ultramassive multiple-input multiple-output (UM-MIMO) and intelligent reflecting surface (IRS) systems are promising for THz communications, to effectively bypass the barrier of limited coverage and line-of-sight blockage. Two challenges arise. First, the huge dimension of the antenna array in UM-MIMO and IRS in contrast with the sub-millimeter wavelength enlarge the nearfield region. Second, strong channel sparsity in THz channels could be detrimental to spatial multiplexing gain and thereby capacity. In this work, a hybrid spherical- and planar-wave channel model (HSPM) is developed for the cascaded channel of the THz integrated UM-MIMO and IRS system. Furthermore, the spatial multiplexing gain under near-field and far-field cases are analyzed, which is proved to be limited by the segment of the cascaded channel with a lower rank, and can be improved based on the widely-space architecture design of UM-MIMO and IRS. Performance evaluation reveals that the proposed HSPM can accurately capture the propagation features of the THz integrated UM-MIMO and IRS system. Numerically, when the array size is 256, the capacity based on the HSPM is only 3 × 10<sup>−4</sup> bits/s/Hz less than that obtained by the ground-truth spherical-wave model." @default.
- W4290996900 created "2022-08-13" @default.
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- W4290996900 date "2022-05-16" @default.
- W4290996900 modified "2023-09-24" @default.
- W4290996900 title "Hybrid Spherical- and Planar-Wave Channel Modeling and Spatial Multiplexing Analysis for Terahertz Integrated UM-MIMO and IRS Systems" @default.
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- W4290996900 doi "https://doi.org/10.1109/icc45855.2022.9839270" @default.
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