Results 21 to 30 of about 1,654 (206)

Mapping reticulospinal drive across various muscles of the upper and lower extremities. [PDF]

Exp Physiol
Abstract The reticulospinal (RS) system is a fundamental descending pathway involved in human movement control. However, the relative strength of RS projections across different muscles and its specific contributions to distinct movements are poorly understood. We systematically mapped the RS drive across a broad range of muscles in the upper and lower
Eilfort AM, Neumann LC, Filli L.
europepmc   +2 more sources

SCMA Codebook Design [PDF]

2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall), 2014
Multicarrier CDMA is a multiple access scheme in which modulated QAM symbols are spread over OFDMA tones by using a generally complex spreading sequence. Effectively, a QAM symbol is repeated over multiple tones. Low density signature (LDS) is a version of CDMA with low density spreading sequences allowing us to take advantage of a near optimal message
Mahmoud Taherzadeh, Hosein Nikopour, Alireza Bayesteh, Hadi Baligh   +3 more
openaire   +2 more sources

Enhancing Signal Space Diversity for SCMA Over Rayleigh Fading Channels [PDF]

, 2023
Sparse code multiple access (SCMA) is a promising technique for the enabling of massive connectivity in future machine-type communication networks, but it suffers from a limited diversity order which is a bottleneck for significant improvement of error ...
Xiao, Pei, Liu, Zilong, Qu Luo, Chen, Gaojie, Zilong Liu, Pei Xiao, Gaojie Chen, Luo, Qu   +7 more
core   +1 more source

A Novel Non-Coherent SCMA With Massive MIMO [PDF]

, 2022
The synergistic amalgamation of sparse code multiple access (SCMA) and multiple-input multiple-output (MIMO) technologies can be exploited for improving spectral efficiency and providing enhanced wireless services to massive users. In this case, however,
Xiao, Pei, Liu, Zilong, Chen, Gaojie, Zilong Liu, Pei Xiao, Ma, Yi, Gaojie Chen, Luo, Qu, Yi Ma, Qu Luo, Amine Maaref, Maaref, Amine, Wen, Haifeng, Haifeng Wen   +13 more
core   +1 more source

SCMA Spectral and Energy Efficiency With QoS [PDF]

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 to achieve optimal performance, e.g., the multiuser interference and high power consumption.
S. Jaber, W. Chen, K. Wang
openaire   +2 more sources

OTFS-NOMA based on SCMA

CoRR, 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.
Kuntal Deka, Anna Thomas, Sanjeev Sharma 0001   +2 more
openaire   +2 more sources

A Simplified Sphere Decoding-Based Detector for Generalized SCMA Codebooks

, 2021
International audienceSparse code multiple access (SCMA) is one of the promising schemes to meet high connectivityand spectral efficiency in the future wireless networks.
Fu, Xiaotian, Uchoa-Filho, Bartolomeu, Le Ruyet, Didier, Fontana da Silva, Bruno   +3 more
core   +1 more source

Sparse Code Multiple Access: Potentials and Challenges

IEEE Open Journal of the Communications Society, 2021
The massive connectivity is among other unprecedented requirements which are expected to be satisfied in order to follow the perpetual increase of connected devices in the era of Internet of Things.
Manel Rebhi, Kais Hassan, Kosai Raoof, Pascal Charge   +3 more
doaj   +1 more source

A Novel Scheme for the Construction of the SCMA Codebook

IEEE Access, 2022
As a code-domain non-orthogonal multiple access technique, sparse code multiple access (SCMA) is considered as a promising technique for future wireless Internet of Things (IoT) networks. The minimum Euclidean distance (MED) and minimum product distance (MPD) have been highlighted as the key performance indicators of the codebooks in additive gaussian ...
TuoFeng Lei, Shuyan Ni, Naiping Cheng, Shimiao Chen, Xin Song   +4 more
openaire   +2 more sources

Grant-Free Sparse Code Multiple Access for Uplink Massive Machine-Type Communications and Its Real-Time Receiver Design

IEEE Open Journal of Circuits and Systems, 2023
Massive Machine-type Communications (mMTCs) is a major use case for the 5G standard. The grant-free (GF) sparse-coded multiple access (SCMA) transmission is particularly spectrum efficient in the sporadic uplink traffic, which is characteristic of the ...
Ti-Yu Chen, Zhi-Jing Lin, Tzi-Dar Chiueh
doaj   +1 more source