Results 21 to 30 of about 15,257,248 (287)
On the Integration of Random Access and DAMA Channels for the Return Link of Satellite Networks [PDF]
, 2013 Recent advances in Random Access (RA), improving throughput and loss rates, make the usage of such technique particularly interesting to complement Demand Assigned Multiple Access (DAMA) channels for the return link of satellite systems.
Munari, Andrea +3 more
core +1 more source
An Enhanced Multiple Random Access Scheme for Satellite Communications [PDF]
, 2012 In this paper, we introduce Multi-Slots Coded ALOHA (MuSCA) as a multiple random access method for satellite communications. This scheme can be considered as a generalization of the Contention Resolution Diversity Slotted Aloha (CRDSA) mechanism. Instead
Bui, Huyen-Chi +6 more
core +1 more source
Purely antiferromagnetic magnetoelectric random access memory
Nature Communications, 2017 Magnetoelectric coupling allows switching of magnetic states via gate voltage pulses. Here the authors propose and demonstrate a purely antiferromagnetic magnetoelectric random access memory based on Cr2O3, reporting 50-fold reduction of writing ...
Tobias Kosub +10 more
doaj +1 more source
Fixed-Symbol Aided Random Access Scheme for Machine-to-Machine Communications
IEEE Access, 2019 The massiveness of devices in crowded Machine-to-Machine (M2M) communications brings new challenges to existing random-access (RA) schemes, such as heavy signaling overhead and severe access collisions.
Zhaoji Zhang, Ying Li, Lei Liu, Wei Hou
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
Location-Based Unsourced Random Access
IEEE AccessWe propose a novel approach to Unsourced Random Access (URA) in which the encoding of each user’s message is associated with the user’s location.
Roshanak Soltani +3 more
doaj +1 more source
NOMA-Based Random Access in mMTC XL-MIMO
IEEE Access, 2023 In machine-type communication (MTC), massive access attempts are generated and the massive MIMO is the key technology to support this demand. To support massive MTC (mMTC), the recent extra-large scale massive multiple-input multiple-output (XL-MIMO ...
Thiago Augusto Bruza Alves, Taufik Abrao
doaj +1 more source
Low-latency random access in wireless networks
ICT Express, 2021 For fast access to the cell, we propose an enhanced random access scheme exploiting multiple transmissions of random access preambles and random access responses.
Eunkyung Kim, Heesoo Lee
doaj +1 more source
Low Latency Random Access for Small Cell Toward Future Cellular Networks
IEEE Access, 2019 In future cellular networks, performance target includes not only increasing data rate, but also reducing latency. The current LTE-Advanced systems require four message exchanges in the random access and uplink transmission procedure, thus inducing high ...
Sundo Kim +5 more
doaj +1 more source
Three-dimensional multi-site random access photostimulation (3D-MAP)
eLife, 2022 Optical control of neural ensemble activity is crucial for understanding brain function and disease, yet no technology can achieve optogenetic control of very large numbers of neurons at an extremely fast rate over a large volume.
Yi Xue +3 more
doaj +1 more source