Results 61 to 70 of about 887 (159)

High Inter‐Specific Diversity and Seasonality of Trunk Radial Growth in Trees Along an Afrotropical Elevational Gradient

Plant, Cell &Environment, Volume 48, Issue 3, Page 2285-2297, March 2025.
ABSTRACT Understanding mechanisms driving tropical tree growth is essential for comprehending carbon sequestration and predicting the future of tropical forests amid rapid deforestation. We conducted a natural experiment in Mount Cameroon to identify climatic factors limiting diurnal and seasonal growth in dominant tree species across a 2200‐m ...
Lenka Plavcová, Jan Tumajer, Jan Altman, Miroslav Svoboda, Annemiek Irene Stegehuis, Vít Pejcha, Jiří Doležal   +6 more
wiley   +1 more source

Design of Enhanced Protograph Codes and Codebooks for IDD-SCMA Systems

IEEE Access
This paper investigates the design of protograph low-density parity-check (PLDPC) codes and Gray-labeling codebooks (CBs) for the sparse code multiple access systems with iterative detection and decoding receiver (IDD-SCMA).
Jiaqin Chen, Huan Ma, Liang Lv, Wuyang Xue   +3 more
doaj   +1 more source

K$K$‐user cyclic shift‐aided serial concatenated code for Gaussian multiple access channel

IET Communications, Volume 19, Issue 1, January/December 2025.
A K‐user cyclic shift‐aided serial concatenated code (SCC) is proposed over a Gaussian multiple access channel. In this code, a cyclic shift‐aided SCC, which integrates a regular repeat‐accumulate code with rate‐1/q$1/q$ and cyclic shift spreading (CSS), is employed for each user. This change avoids complex interleaving operation and the main objective
Meilin He, Mingjue Zhu, Zhaoyang Zhang, Rui Guo, Haiquan Wang   +4 more
wiley   +1 more source

Performance characterization and combination design optimization of fast-melting SBS/CR modified asphalt

Case Studies in Construction Materials
To broaden the application prospects of fast-melting styrene-butadiene-styrene modifiers (F-SBS) and meet diverse requirements, this study utilizes crumb rubber (CR) as a partial substitute for F-SBS to prepare fast-melting SBS/CR modified asphalt (F ...
Jinyao Li, Wenwu Zhang, Weiwei Lu, Songtao Lv, Haihui Duan, Jinping Wang   +5 more
doaj   +1 more source

Scheme Design of SR‐DCSK‐WPC System With Energy Buffer in RIS‐Assisted Design

IET Communications, Volume 19, Issue 1, January/December 2025.
This research examines the performance improvement of chaotic communication assisted by reconfigurable intelligent surface. Currently, our paper explores the time switching scheme of SWIPT system and the time allocation characteristics of short reference technology, and reconstructs the implementation scheme of the time allocation coefficient.
Gongquan Zhang, Yu Ren, Xiaoting Chen, Xulai Zhu   +3 more
wiley   +1 more source

A Physically Realisable Adversarial Attack Method Based on Attributed Scattering Centre Model

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
In order to make the generated adversarial examples more easily implementable in the physical domain in remote sensing, this article proposes a novel adversarial attack method based on radar imaging principles and the Attribute Scattering Centre Model (ASCM). Experiments on the MSTAR dataset targeting four typical deep learning networks—ResNet50, VGG11,
Bo Wei, Huagang Xiong, Teng Huang, Huanchun Wei, Yan Pang   +4 more
wiley   +1 more source

Iterative Clipping Noise Elimination of Clipped and Filtered SCMA-OFDM System

IEEE Access, 2018
Similar to conventional orthogonal frequency division multiplexing (OFDM) signal, the signals of sparse code multiple access combine with orthogonal frequency division multiplexing (SCMA-OFDM) existing the problem that its peak-to-average power ratio ...
Lin Yang, Xubin Lin, Xinying Ma, Shaoqian Li   +3 more
doaj   +1 more source

HARQ scheme for sparse code multiple access based on network coding

Tongxin xuebao, 2022
To fulfill the stringent reliability and throughput demand of the beyond-5G and the forthcoming 6G, a novel network coding (NC) based hybrid automatic retransmission request (HARQ) for low-density parity check (LDPC) coded SCMA was proposed.Two ...
Ke LAI, Jing LEI, Wei LIU, Lei WEN
doaj   +2 more sources

Colonizers on the road: European bee‐eaters shift nest‐site selection to roadside habitats

Ecology, Volume 106, Issue 6, June 2025.
Jacinto Román, Julio Blas, Giulia Bastianelli, Miguel A. Suárez‐Couselo, Eloy Revilla, Marcello D'Amico   +5 more
wiley   +1 more source

Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED

IEEE Access, 2018
An optimized design of a sparse code multiple access (SCMA) codebook for uplink wireless communications is presented by dividing an optimized 16-point round quadrature amplitude modulation (QAM) into several subsets.
Shunlan Liu, Jing Wang, Jianrong Bao, Chao Liu   +3 more
doaj   +1 more source