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Near-Field Communications: A Degree-of-Freedom Perspective
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Near-Field Communications: A Degree-of-Freedom Perspective
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Multiple-antenna technologies are advancing towards large-scale aperture sizes and extremely high frequencies, leading to the emergence of near-field communications (NFC) in future wireless systems. To this context, we investigate the degree of freedom (DoF) in near-field multiple-input multiple-output (MIMO) systems. We consider both spatially discrete (SPD) antennas and continuous aperture (CAP) antennas. Additionally, we explore three important DoF-related performance metrics and examine their relationships with the classic DoF. Numerical results demonstrate the benefits of NFC over far-field communications (FFC) in terms of providing increased spatial DoFs. We also identify promising research directions for NFC from a DoF perspective.
Forward citations
Cited by 3 Pith papers
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On Spatial Degree-of-Freedom Analysis of Near-Field Multipath Channels for Ultra-massive MIMO Systems
Derives a generic DoF metric for NF UM-MIMO multipath channels as the effective union of per-path contributions (electrical aperture times subtended solid angle), with eigenvalue-to-power mapping, validated via simula...
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Near-Field Communications with Different Array Geometries: Rayleigh Distance, Channel Estimation, and Transmission Design
A near-field spatial non-stationary channel model for planar and modular curved XL-MIMO arrays is derived, an AE-aided AMP estimator with replica bound is proposed, and joint array-geometry and hybrid-precoding optimi...
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Near-Field Communications with Different Array Geometries: Rayleigh Distance, Channel Estimation, and Transmission Design
Fixing arc length, curving a large array shrinks its near-field region in front but grows it to the sides, and a learned AMP estimator recovers non-stationary near-field channels for arbitrary geometries.
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