Results 51 to 60 of about 7,220 (258)

A Superimposed Codebook Design for Downlink Sparse Code Multiple Access Visible Light Communication System

Photonics
The capacity performance of visible light communication (VLC) systems can be improved by using sparse code multiple access (SCMA). Since SCMA is a codebook-based multiple access scheme, the design of the codebook is crucial.
Jingxuan Dong, Zixiong Wang, Jinlong Yu, Yang Jiang   +3 more
doaj   +1 more source

Evolving Features of RASopathies Among Pregnancies With Abnormal Fetal Fluid Collections

Prenatal Diagnosis, EarlyView.
ABSTRACT Objective We aimed to characterize the fetal features across gestation and describe genotype‐phenotype correlations for pregnancies with fetal RASopathies that were more severely affected as they presented with at least one abnormal fluid collection.
Natalie B. Gulrajani, John Boscardin, Billie R. Lianoglou, Katie Tick, Carmen M. A. Santoli, Kristen A. Miller, Angie C. Jelin, Lorraine Dugoff, Rose Giardine, Cori Feist, Rachel Pilliod, Stephanie Dukhovny, Kelly Gilmore, Neeta L. Vora, Aisling Murphy, Peter N. Robinson, Mary E. Norton, Teresa N. Sparks   +17 more
wiley   +1 more source

Communication‐Security Co‐Design for Federated Learning in Grant‐Free NOMA IoT Networks

IET Communications, Volume 20, Issue 1, January/December 2026.
This article presents SA‐PPO, a Security‐Aware Proximal Policy Optimisation framework for federated learning over grant‐free NOMA (non‐orthogonal multiple access) in IoT networks. By jointly optimising access control, resource allocation, and trust‐weighted aggregation using cross‐layer indicators, SA‐PPO enhances both communication reliability and ...
Emmanuel Atebawone, Kwame Opuni‐Boachie Obour Agyekum, James Dzisi Gadze, Kwasi Adu‐Boahen Opare, Owusu Agyeman Antwi, Robert Akromond   +5 more
wiley   +1 more source

CG-SCMA Codebook Design Based on Maximized Euclidian Distance

Journal of Telecommunications and Information Technology, 2023
Sparse code multiple access (SCMA) is a multi-dimensional codebook based on a class of non-orthogonal multiple access (NOMA) technologies enabling the delivery of non-orthogonal resource elements to numerous users in 5G wireless communications without ...
Sura S. Mohamed, Hikmat N. Abdullah
doaj   +1 more source

On the design of multiuser codebooks for uplink SCMA systems [PDF]

, 2016
Sparse code multiple access (SCMA) is a promising uplink multiple access technique that can achieve superior spectral efficiency, provided that multidimensional codebooks are carefully designed.
Bao, J., Ding, Z., Karagiannidis, G. K., Ma, Z., Zhu, Z.   +4 more
core   +1 more source

Head and Neck Muscle Activity in Post‐Stroke Dysphagia Patients: Muscle Dynamics and Implications for Rehabilitation

Journal of Oral Rehabilitation, Volume 52, Issue 12, Page 2379-2391, December 2025.
Surface electromyography (sEMG) was used to collect the electromyographic signals of the head and neck muscles during swallowing and phonatory tasks, revealing the differences in muscle activation levels of patients with dysphagia under different phonatory tasks.
Yingying Zhang, Mingyuan Wu, Weixia Yu, Yinuo Dai, Zhina Gong, Chunyan Niu, Jianzheng Cai   +6 more
wiley   +1 more source

Design Low Complexity SCMA Codebook Using Arnold’s Cat Map

Journal of Telecommunications and Information Technology, 2022
In 5G wireless communications, sparse code multiple access (SCMA) – a multi-dimensional codebook based on a specific category of the non-orthogonal multiple access (NOMA) technique - enables many users to share non-orthogonal resource components with a ...
Sura S. Mohamed, Hikmat N. Abdullah
doaj   +1 more source

V2X Meets NOMA: Non-Orthogonal Multiple Access for 5G Enabled Vehicular Networks

, 2017
Benefited from the widely deployed infrastructure, the LTE network has recently been considered as a promising candidate to support the vehicle-to-everything (V2X) services.
Di, Boya, Han, Zhu, Li, Yonghui, Song, Lingyang   +3 more
core   +1 more source

Dual‐mode codeword position index based SCMA with transmit diversity

IET Communications
Codeword position index based sparse code multiple access (CPI‐SCMA) is an effective scheme that expands codeword positions in the time domain and carries extra information by their index.
Yanbing Yang, Jing Lei, Ke Lai
doaj   +1 more source

Secure Transmission With Randomized Constellation Rotation for Downlink Sparse Code Multiple Access System

IEEE Access, 2018
Sparse code multiple access (SCMA) is a promising candidate air interface of next-generation mobile networks. In this paper, we focus on a downlink SCMA system where a transmitter sends confidential messages to multiple users in the presence of external ...
Ke Lai, Jing Lei, Lei Wen, Gaojie Chen, Wei Li, Pei Xiao   +5 more
doaj   +1 more source