Results 71 to 80 of about 3,462 (189)

Two-Dimensional Direction-of-Arrival Fast Estimation of Multiple Signals with Matrix Completion Theory in Coprime Planar Array

Sensors, 2018
In estimating the two-dimensional (2D) direction-of-arrival (DOA) using a coprime planar array, the main issues are the high complexity of spectral peak search and the limited degree of freedom imposed by the number of sensors.
Haiyun Xu, Yankui Zhang, Bin Ba, Daming Wang, Xiangzhi Li   +4 more
doaj   +1 more source

Tailoring surface codes for highly biased noise

, 2019
The surface code, with a simple modification, exhibits ultra-high error correction thresholds when the noise is biased towards dephasing. Here, we identify features of the surface code responsible for these ultra-high thresholds.
Bartlett, Stephen D., Bravyi, Sergey, Chubb, Christopher T., Darmawan, Andrew S., Flammia, Steven T., Tuckett, David K.   +5 more
core   +1 more source

Mixability of Finite Groups

Random Structures &Algorithms, Volume 67, Issue 4, December 2025.
ABSTRACT A finite group G$$ G $$ is mixable if a product of random elements, each chosen independently from two options, can distribute uniformly on G$$ G $$. We present conditions and obstructions to mixability. We show that 2‐groups, the symmetric groups, the simple alternating groups, several matrix and sporadic simple groups, and most finite ...
Gideon Amir, Guy Blachar, Subhajit Ghosh, Uzi Vishne   +3 more
wiley   +1 more source

Coefficients of Sylvester's Denumerant [PDF]

, 2013
For a given sequence $\mathbf{\alpha} = [\alpha_1,\alpha_2,\dots,\alpha_{N+1}]$ of $N+1$ positive integers, we consider the combinatorial function $E(\mathbf{\alpha})(t)$ that counts the nonnegative integer solutions of the equation $\alpha_1x_1+\alpha_2
Baldoni, Velleda, Berline, Nicole, De Loera, Jesús, Dutra, Brandon, Köppe, Matthias, Vergne, Michèle   +5 more
core   +3 more sources

Virtual array interpolation for coprime arrays: a signal reconstruction perspective

Electronics Letters, 2020
Coprime arrays can highly increase degree‐of‐freedom by operating the second‐order virtual signal. However, the corresponding virtual array is discontiguous, and thus most existing direction‐of‐arrival estimation approaches fail to utilise all received information.
Zhen Chen, Chongyi Fan, Xiaotao Huang
openaire   +1 more source

Iitaka fibrations and integral points: A family of arbitrarily polarized spherical threefolds

Journal of the London Mathematical Society, Volume 112, Issue 6, December 2025.
Abstract Studying Manin's program for a family of spherical log Fano threefolds, we determine the asymptotic number of integral points whose height associated with an arbitrary ample line bundle is bounded. This confirms a recent conjecture by Santens and sheds new light on the logarithmic analog of Iitaka fibrations, which have not yet been adequately 
Ulrich Derenthal, Florian Wilsch
wiley   +1 more source

Near-Field Localization With Coprime Array

Proceedings of the 30th Annual International Conference on Mobile Computing and Networking
Large-aperture coprime arrays (CAs) are expected to achieve higher sensing resolution than conventional dense arrays (DAs), yet with lower hardware and energy cost. However, existing CA far-field localization methods cannot be directly applied to near-field scenarios due to channel model mismatch.
Hongqiang Cheng, Changsheng You, Cong Zhou   +2 more
openaire   +2 more sources

Units in group rings and blocks of Klein four or dihedral defect

Bulletin of the London Mathematical Society, Volume 57, Issue 11, Page 3470-3489, November 2025.
Abstract We obtain restrictions on units of even order in the integral group ring ZG$\mathbb {Z}G$ of a finite group G$G$ by studying their actions on the reductions modulo 4 of lattices over the 2‐adic group ring Z2G$\mathbb {Z}_2G$. This improves the “lattice method” which considers reductions modulo primes p$p$, but is of limited use for p=2$p=2 ...
Florian Eisele, Leo Margolis
wiley   +1 more source

Taking limits in topological recursion

Journal of the London Mathematical Society, Volume 112, Issue 3, September 2025.
Abstract When does topological recursion applied to a family of spectral curves commute with taking limits? This problem is subtle, especially when the ramification structure of the spectral curve changes at the limit point. We provide sufficient (straightforward‐to‐use) conditions for checking when the commutation with limits holds, thereby closing a ...
Gaëtan Borot, Vincent Bouchard, Nitin Kumar Chidambaram, Reinier Kramer, Sergey Shadrin   +4 more
wiley   +1 more source

A Novel Noncircular MUSIC Algorithm Based on the Concept of the Difference and Sum Coarray

Sensors, 2018
In this paper, we propose a vectorized noncircular MUSIC (VNCM) algorithm based on the concept of the coarray, which can construct the difference and sum (diff–sum) coarray, for direction finding of the noncircular (NC) quasi-stationary sources ...
Zhenhong Chen, Yingtao Ding, Shiwei Ren, Zhiming Chen   +3 more
doaj   +1 more source