Results 21 to 30 of about 311,948 (264)
On the module of differentials of order n of hypersurfaces [PDF]
Journal of Pure and Applied Algebra, 2020 We give an explicit presentation of the module of differentials of order $n$ of a finitely generated algebra via a higher-order Jacobian matrix. We use the presentation to study some aspects of this module in the case of hypersurfaces. More precisely, we prove higher-order versions of known results relating freness and torsion-freness of the module of ...
Barajas, Paul, Duarte, Daniel
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Differential Faster-Than-Nyquist Signaling
IEEE Access, 2018 In this paper, we propose a novel differential faster-than-Nyquist (DFTN) signaling concept that allows us to dispense with any channel estimation at the receiver, while benefiting from a rate boost specific to faster-than-Nyquist (FTN) signaling.
Takumi Ishihara, Shinya Sugiura
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Differential Downlink Transmission in Massive MU-MIMO Systems
IEEE Access, 2019 In this paper, a differential downlink transmission scheme is proposed for a massive multiple-input multiple-output (MIMO) system without explicit channel estimation. In particular, we use a downlink precoding technique combined with a different encoding
Fahad Alsifiany +3 more
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Frontiers in Physics, 2022 Underwater wireless optical communication is facing absorption, scattering problems, which, in principle, can be greatly resolved by underwater photon-counting communication (UPCC) technology that exhibits high-sensitivity communication characteristics ...
Xiaotian Han +9 more
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On Fitting Ideals of Kahler Differential Module [PDF]
Symmetry, 2018 Let k be an algebraically closed field of characteristic zero, and R / I and S / J be algebras over k . Ω 1 ( R / I ) and Ω 1 ( S / J ) denote universal module of first order derivation over k . The main result of this paper asserts that the first nonzero Fitting ideal Ω 1 ( R / I ⊗
Nurbige Turan, Necati Olgun
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Space–Time Coded Differential Modulation for Reconfigurable Intelligent Surfaces
IEEE Open Journal of the Communications SocietyReconfigurable Intelligent Surfaces (RIS) hold the promise of significantly improving coverage, as well as spectral and energy efficiency in wireless communication systems.
Jiawei Qiu, Harry Leib
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Differential spatial modulation for high-rate transmission systems
EURASIP Journal on Wireless Communications and Networking, 2018 This paper introduces a new differential spatial modulation (DSM) scheme which subsumes both the previously introduced DSM and high-rate spatial modulation (HR-SM) for wireless multiple input multiple output (MIMO) transmission. By combining the codeword
Thu Phuong Nguyen +3 more
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Low-Complexity Differential Spatial Modulation Schemes for a Lot of Antennas
IEEE Access, 2020 Spatial modulation (SM) uses a single antenna for transmission each time to avoid synchronization and interferences among transmitter antennas, and differential SM (DSM) is a kind of SM technique that does not need pilot symbols and channel estimation ...
Ruey-Yi Wei
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Differential space time media‐based modulation system
IET Communications, 2022 Differential spatial modulation (DSM) is a multi‐antenna differential technology with low power consumption and no demand of channel estimation. It is suitable for communication systems that have fast migration velocity and high requirements for both ...
Hongliang Zou +3 more
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Applied Sciences, 2023 To obtain highly sensitive, accurate, fast, and repeatable measurements of waveplate parameters over an entire clear aperture, a novel measurement method using dual differential frequency photoelastic modulations is proposed.
Kewu Li, Shuang Wang, Zhibin Wang
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