Results 11 to 20 of about 1,654 (206)

Enabling Sphere Decoding for SCMA [PDF]

IEEE Communications Letters, 2017
In this paper, we propose a reduced-complexity optimal modified sphere decoding (MSD) detection scheme for SCMA. As SCMA systems are characterized by a number of resource elements (REs) that are less than the number of the supported users, the channel matrix is rank-deficient, and sphere decoding (SD) cannot be directly applied.
Monirosharieh Vameghestahbanati, Ebrahim Bedeer, Ian D. Marsland, Ramy H. Gohary, Halim Yanikomeroglu   +4 more
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Design of Power-Imbalanced SCMA Codebook [PDF]

IEEE Transactions on Vehicular Technology, 2022
Sparse code multiple access (SCMA) is a promising multiuser communication technique for the enabling of future massive machine-type networks. Unlike existing codebook design schemes assuming uniform power allocation, we present a novel class of SCMA codebooks which display power imbalance among different users for downlink transmission.
Xudong Li 0005, Zhicheng Gao, Yiming Gui, Zilong Liu 0001, Pei Xiao 0001, Lisu Yu   +5 more
openaire   +5 more sources

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   +2 more sources

Asynchronous Flipped Grant-Free SCMA for Satellite-Based Internet of Things Communication Networks

Applied Sciences, 2019
Sparse code multiple access (SCMA) is a promising code domain non-orthogonal multiple-access scheme which is able to support massive connectivity and grant-free transmission in future satellite-based Internet of Things (IoT) communication networks ...
Pengxu Li, Gaofeng Cui, Weidong Wang
doaj   +2 more sources

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   +2 more sources

Toward High-Performance Implementation of 5G SCMA Algorithms

IEEE Access, 2019
The recent evolution of mobile communication systems toward a 5G network is associated with the search for new types of non-orthogonal modulations such as sparse code multiple access (SCMA).
Alireza Ghaffari, Mathieu Leonardon, Adrien Cassagne, Camille Leroux, Yvon Savaria   +4 more
doaj   +3 more sources

Uplink SCMA with STBC in Fading Channels

2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring), 2020
Sparse code multiple access (SCMA) is an attractive non-orthogonal multiple access scheme for wireless communications. Meanwhile, space-time block coding (STBC) can achieve high diversity gains in fading channels. This paper proposes an uplink SCMA-STBC with a space-time-based message-passing algorithm (ST-MPA).
Huan-Ying Li, Zi-Jing Liu, Qiyue Yu, Wei Xiang 0001, Fumiyuki Adachi   +4 more
openaire   +2 more sources

Low-Complexity Codebook Design for SCMA-Based Visible Light Communication [PDF]

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   +2 more sources

The Max-Re-LOGMPA for SCMA Demodulation

Wireless Personal Communications, 2019
Sparse code multiple access (SCMA) is one of the algorithms in non-orthogonality multiple access. The algorithm utilizes advanced multi-dimensional codebook to acquire high shaping gain, meanwhile, SCMA takes advantage of message passing algorithm (MPA) to obtain low computation complexity in demodulation.
Hao Li 0041, Chang Wu 0002, Dan Cheng, Yang Yang 0080, Chao Wang 0003   +4 more
openaire   +2 more sources

Cuneiform Nucleus Stimulation Can Assist Gait Training to Promote Locomotor Recovery in Individuals With Incomplete Tetraplegia. [PDF]

Ann Neurol
Objective Impaired ability to induce stepping after incomplete spinal cord injury (SCI) can limit the efficacy of locomotor training, often leaving patients wheelchair‐bound. The cuneiform nucleus (CNF), a key mesencephalic locomotor control center, modulates the activity of spinal locomotor centers via the reticulospinal tract.
Hofer AS, Stieglitz LH, Bolliger M, Filli L, Cathomen A, Willi R, Lerch I, Krüsi I, Giagiozis M, Meyer C, Schubert M, Hubli M, Kessler TM, Demkó L, Baumann CR, Imbach L, Oertel MF, Prusse A, Kiseleva A, Regli L, Schwab ME, Curt A.   +21 more
europepmc   +2 more sources