Results 31 to 40 of about 887 (159)
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 +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
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 +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
, 2020 Orthogonal Time Frequency Space (OTFS) is a $\text{2-D}$ modulation technique that has the potential to overcome the challenges faced by orthogonal frequency division multiplexing (OFDM) in high Doppler environments. The performance of OTFS in a multi-user scenario with orthogonal multiple access (OMA) techniques has been impressive.
Deka, Kuntal +2 more
openaire +2 more sources
Sparse Code Multiple Access (SCMA) Technique
, 2023 Next-generation wireless networks require higher spectral efficiency and lower latency to meet the demands of various upcoming applications. Recently, non-orthogonal multiple access (NOMA) schemes are introduced in the literature for 5G and beyond. Various forms of NOMA are considered like power domain, code domain, pattern division multiple access ...
Sharma, Sanjeev, Deka, Kuntal
openaire +2 more sources
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 +5 more
doaj +1 more source
Dual‐mode codeword position index based SCMA with transmit diversity
IET CommunicationsCodeword 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
Message Passing Algorithm Receiver Design for RIS-Assisted Downlink MIMO-SCMA System
Applied SciencesSparse code multiple access (SCMA) and reconfigurable intelligent surfaces (RISs) are two promising techniques in the forthcoming 6G communication networks to provide massive connectivity and enhance the spectral efficiency.
Dun Feng +5 more
doaj +1 more source
Enabling High Order SCMA Systems in Downlink Scenarios With a Serial Coding Scheme
IEEE Access, 2018 In the future fifth generation communication systems, sparse code multiple access (SCMA) shows strong competitiveness as a novel non-orthogonal multiple access (NOMA) technique. Attributing to multi-dimensional codebooks, the SCMA can obtain shaping gain
Yuxi Han +3 more
doaj +1 more source