Results 11 to 20 of about 4,905,659 (296)
Semi-Grant-Free NOMA: A Stochastic Geometry Model [PDF]
IEEE Transactions on Wireless Communications, 2022 Grant-free (GF) transmission holds promise in terms of low latency communication by directly transmitting messages without waiting for any permissions. However, collision situations may frequently happen when limited spectrum is occupied by numerous GF users.
Chao Zhang 0048 +2 more
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Drones, 2022 In the massive machine type of communication (mMTC), grant-free non-orthogonal multiple access (NOMA) is receiving more and more attention because it can skip the complex grant process to allocate non-orthogonal resources to serve more users.
Shuo Chen +4 more
doaj +1 more source
ICC 2023 - IEEE International Conference on Communications, 2023 This paper introduces a reconfigurable intelligent surface (RIS)-assisted grant-free non-orthogonal multiple-access (GF-NOMA) scheme. To ensure the power reception disparity required by the power domain NOMA (PD-NOMA), we propose a joint user clustering and RIS assignment/alignment approach that maximizes the network sum rate by judiciously pairing ...
Recep A. Tasci +5 more
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Deep Learning-Based Blind Multiple User Detection for Grant-Free SCMA and MUSA Systems
IEEE Transactions on Machine Learning in Communications and Networking, 2023 Massive machine-type communications (mMTC) in 6G requires supporting a massive number of devices with limited resources, posing challenges in efficient random access.
Sivalingam Thushan +4 more
doaj +1 more source
Smart Beamforming for Direct LEO Satellite Access of Future IoT
Sensors, 2021 Non-terrestrial networks (NTN) are expected to play a key role in extending and complementing terrestrial 5G networks in order to provide services to air, sea, and un-served or under-served areas.
Marius Caus +2 more
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Multi-User IR-HARQ Latency and Resource Optimization for URLLC
IEEE Access, 2023 The ultra-reliable low-latency communications (URLLC) tight latency requirements paired with transmission of small payload packets motivates the development of techniques that reduce or eliminate the need for dynamic scheduling.
Rafael Santos +3 more
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Enumeration and Identification of Active Users for Grant-Free NOMA Using Deep Neural Networks
IEEE Access, 2022 In next-generation mobile radio systems, multiple access schemes will support a massive number of uncoordinated devices exhibiting sporadic traffic, transmitting short packets to a base station.
Muhammad Usman Khan +2 more
doaj +1 more source
Joint User and Data Detection in Grant-Free NOMA With Attention-Based BiLSTM Network
IEEE Open Journal of the Communications Society, 2023 We consider the multi-user detection (MUD) problem in uplink grant-free non-orthogonal multiple access (NOMA), where the access point has to identify the total number and correct identity of the active Internet of Things (IoT) devices and decode their ...
Saud Khan +4 more
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Compressive Sensing-Based Secure Uplink Grant-Free Systems
Frontiers in Signal Processing, 2022 Compressive sensing (CS) has been extensively employed in uplink grant-free communications, where data generated from different active users are transmitted to a base station (BS) without following the strict access grant process. Nevertheless, the state-
Yuanchen Wang +8 more
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Optimization of Grant-Free NOMA With Multiple Configured-Grants for mURLLC [PDF]
IEEE Journal on Selected Areas in Communications, 2022 15 pages, 15 figures, submitted to IEEE JSAC SI on Next Generation Multiple Access.
Yan Liu 0072 +4 more
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