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20 results for “non-square UPAs”

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eess.SPcs.ITTheoreticalRecentJul 21, 2026

Non-Square UPA-Enabled XL-MIMO Systems: Anisotropic Near-Field Characterization, Fundamental Limits, and Channel Estimation

Yilong Liu, Xi Yang, Jing Xu, Jun Zhang +1 more

This paper investigates the performance impact of non-square uniform planar arrays (UPAs) on extremely large-scale multiple-input multiple-output (XL-MIMO) systems, deriving effective beamfocusing dis…

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cs.CGcs.DMmath.COTheoreticalRecentJun 25, 2026

Unbent collections of non-planar $s$-grid-drawing

Therese Biedl

The paper shows that for non-planar orthogonal drawings of a graph, two drawings are sufficient instead of the planar case's three.

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cs.DScs.DMTheoreticalRecentJun 11, 2026

(Un)ranking Permutation Classes

Nathanaël Hassler, Vincent Vajnovszki

This paper presents methods for ranking and unranking permutations avoiding a pattern of length three in lexicographic or colexicographic order.

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cs.DMTheoreticalRecentJun 27, 2026

Local Minima in Quadratic-Penalty Relaxations of Binary Linear Programs

Cheng-Han Huang, Yongliang Sun, Chaoyan Huang, Ismail Alkhouri +1 more

The paper establishes conditions for QUBO formulations of combinatorial optimization problems that guarantee valid binary and feasible local minimizers using gradient-based methods.

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cs.CGRecentMay 29, 2026

How Many Slopes Does Polynomial Area Cost?

Michael A. Bekos, Eleni Katsanou, Philipp Kindermann, Maria Eleni Pavlidi

The paper systematically studies the trade-offs between the number of slopes, bends per edge, and required area for planar drawings of bounded-degree graphs, providing new constructions for high-degre…

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math.COcs.DMEmpiricalRecentJul 7, 2026

Symmetric lexicographic symmetric-subset reverse search for the enumeration of circuits, cocircuits, and triangulations up to symmetry

Jörg Rambau

This paper introduces and implements variants of the symmetric lexicographic symmetric-subset reverse search framework for enumerating symmetric feasible subsets of a finite set, applying it to cocirc…

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cs.DSTheoreticalRecentJun 19, 2026

Online Stacking with a Few Load/Unload Points

Martin Olsen

A simple online algorithm is presented for the stacking problem to avoid shifts with a sufficient condition involving stacking area dimension, load/unload points, and maximum items.

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cs.DScs.CCTheoreticalRecentJun 11, 2026

Sketching Intersection Profiles: A Simple Proof and Three Applications

Flavio Chierichetti, Mirko Giacchini, Ravi Kumar, Alessandro Panconesi +2 more

This paper settles the complexity of three sketching problems in graphs and distributions.

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cs.CCcs.DMcs.DSTheoreticalRecentJul 3, 2026

Edge Geography is XNLP-hard for Pathwidth and in XP for Tree-Partition Width

Thobias Kvalvik Høivik, Erlend Raa Vågset

The paper proves XNLP-hardness of Directed Edge Geography and Undirected Edge Geography when parameterized by pathwidth, and shows their fixed-parameter tractability when parameterized by treewidth an…

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cs.CRRecentMay 3, 2026

Chain Reactions: How Nonce Collisions in ECDSA Compromise Polygon MEV Searchers

Yash Madhwal, Andrey Seoev, Raffaele Della Pietra, Anastasiia Smirnova +1 more

The paper reveals that predictable nonce reuse by Polygon MEV searchers creates a critical vulnerability in ECDSA signatures, allowing passive attackers to recover private keys using linear algebra.

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cs.DMTheoreticalRecentJun 11, 2026

Fibonacci and Catalan Numbers Meet in Staircase Polyominoes

Jean-Luc Baril, José Luis Ramírez, Samuel Ramírez, Diego Villamizar

This paper derives multivariate generating functions to refine the enumeration of Fibonacci polyominoes.

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math.COcs.DMmath.NTTheoreticalRecentJul 8, 2026

Small Matrices with Large Inverses: Unimodular $4 \times 4$ Cases

Steven Finch

This paper investigates the closeness of singularity for $n imes n$ unimodular matrices, specifically for $(2k+1)$-ary and $(k+1)$-ary cases of $4 imes 4$ nonnegative unimodular matrices.

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cs.PFcs.ARRecentMay 27, 2026

Range, Not Precision: Block-Floating-Point Half-Precision FFT and SAR Imaging on Apple Silicon

Mohamed Amine Bergach

The paper demonstrates that for FFT-based radar imaging on Apple Silicon, the limiting factor for half-precision (FP16) is dynamic range, not mantissa precision, and proposes a block-floating-point (B…

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cs.DMTheoreticalRecentJul 3, 2026

Scheduling Tasks towards Energy Autarky: Benefits and Computational Costs of Flexibility

Robert Bredereck, Till Fluschnik, Klaus Heeger

This paper studies the autarky problem of scheduling energy-consuming jobs with time windows using a battery and an energy forecast, and shows NP-hardness, polynomial-time solvability, and fixed-param…

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