Results 31 to 40 of about 30,188 (287)

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

A New Multiple Access Technique for 5G: Power Domain Sparse Code Multiple Access (PSMA)

IEEE Access, 2018
In this paper, a new approach for multiple access in the fifth generation (5G) of cellular networks called power domain sparse code multiple access (PSMA) is proposed. In PSMA, we adopt both the power domain and the code domain to transmit multiple users'
Mohammad Moltafet, Nader Mokari, Mohammad Reza Javan, Hamid Saeedi, Hossein Pishro-Nik   +4 more
doaj   +1 more source

SCMA Spectral and Energy Efficiency With QoS

IEEE Access, 2021
Sparse code multiple access (SCMA) is one of the promising candidates for new radio access interface. The new generation communication system is expected to support massive user access with high capacity. However, there are numerous problems and barriers
S. Jaber, W. Chen, K. Wang
doaj   +1 more source

Grant-Free Uplink Transmission With Multi-Codebook-Based Sparse Code Multiple Access (MC-SCMA)

IEEE Access, 2019
In sparse code multiple access (SCMA)-based grant-free (GF) access, both user's channel and the selected SCMA codebook (CB) are considered as a transmission signature for multi-user detection (MUD). In conventional SCMA-based grant-free (GF) access where
Ameha Tsegaye Abebe, Chung G. Kang
doaj   +1 more source

Deep-Unfolded Sparse CDMA: Multiuser Detector and Sparse Signature Design

IEEE Access, 2021
Sparse code division multiple access (SCDMA) is a promising non-orthogonal multiple access technique for future wireless communications. In SCDMA, transmitted symbols from multiple users are coded by their own sparse signature sequences, and a base ...
Satoshi Takabe, Yuki Yamauchi, Tadashi Wadayama   +2 more
doaj   +1 more source

Low-Complexity Codebook Design for SCMA-Based Visible Light Communication

IEEE Open Journal of the Communications Society, 2022
Sparse code multiple access (SCMA), as a code-domain non-orthogonal multiple access (NOMA) scheme, has received considerable research attention for enabling massive connectivity in future wireless communication systems.
Saumya Chaturvedi, Dil Nashin Anwar, Vivek Ashok Bohara, Anand Srivastava, Zilong Liu   +4 more
doaj   +1 more source

Interleaving based SCMA Codebook Design Using Arnold’s Cat Chaotic Map

Iraqi Journal of Information & Communication Technology, 2023
Non-orthogonal multiple access (NOMA) technology is a significant topic of the present 5G investigation. A possible NOMA approach is Sparse Code Multiple Access (SCMA), increasing next-generation communication's ability to handle multiple users. In SCMA,
Sura S. Mohamed, Hikmat N. Abdullah
doaj   +1 more source

Improved MAX-Log MPA multiuser detection algorithm in SCMA system

Dianzi Jishu Yingyong, 2018
Sparse code multiple access(SCMA) is a novel non-orthogonal multiple access scheme to face the future 5G communication. In allusion to the problem that sparse code multiple access(SCMA) system based on a logarithm-domain MAX-Log message passing algorithm(
Wu Xiong, Ge Wenping, Zhang Xuewan, Dai Wenli   +3 more
doaj   +1 more source

SNUPN‐Related Muscular Dystrophy: Novel Phenotypic, Pathological and Functional Protein Insights

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective SNUPN‐related muscular dystrophy or LGMDR29 is a new entity that covers from a congenital or childhood onset pure muscular dystrophy to more complex phenotypes combining neurodevelopmental features, cataracts, or spinocerebellar ataxia. So far, 12 different variants have been described.
Nuria Muelas, Pablo Iruzubieta, Alberto Damborenea, Laura Pérez‐Fernández, Inmaculada Azorín, Juan Carlos Jiménez García, Ana Töpf, Pilar Martí, Lorena Fores‐Toribio, María Manterola, Rosana Blanco‐Mañez, Oihane Pikatza‐Menoio, Sonia Alonso‐Martín, Volker Straub, Aitziber L. Cortajarena, Adolfo López de Munain, David De Sancho, Lorea Blázquez, Juan J. Vilchez   +18 more
wiley   +1 more source

CSF Levels of NPTX2 Are Associated With Less Brain Atrophy Over Time in Cognitively Unimpaired Individuals

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Introduction Neuronal pentraxin 2 (NPTX2) is a synaptic protein involved in synaptic plasticity and regulation of neuronal excitability. Lower baseline cerebrospinal fluid (CSF) NPTX2 levels have been shown to be associated with an earlier onset of mild cognitive impairment (MCI), a pre‐dementia syndrome, even after CSF Alzheimer's Disease (AD)
Juan P. Vazquez, Corinne Pettigrew, Yuxin Zhu, Claire Anderson, Guray Erus, Christos Davatzikos, Michael Miller, Abhay Moghekar, Sungtaek Oh, Chan‐Hyun Na, Marilyn Albert, Paul Worley, Anja Soldan   +12 more
wiley   +1 more source