Random beamforming OFDMA for future generation cellular communication systems [PDF]
, 2007 This paper presents a downlink performance analysis of a Layered Random Beamforming (LRB) - MIMO-OFDMA Physical Layer (PHY) as applicable to future generation wireless communication systems.
Joe McGeehan +9 more
core +1 more source
Modern Random Access: An Age of Information Perspective on Irregular Repetition Slotted ALOHA [PDF]
IEEE Transactions on Communications, 2020 Age of information (AoI) is gaining attention as a valuable performance metric for many IoT systems, in which a large number of devices report time-stamped updates to a central gateway.
A. Munari
semanticscholar +1 more source
Physical Channel Access (PCA): Time and Frequency Access Methods Simulation in NS-2 [PDF]
, 2013 We present an NS-2 module, Physical Channel Access (PCA), to simulate different access methods on a link shared with Multi-Frequency Time Division Multiple Access (MF-TDMA). This technique is widely used in various network technologies, such as satellite
Mehani, Olivier +12 more
core +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
Spatial spectrum and energy efficiency of random cellular networks [PDF]
, 2015 It is a great challenge to evaluate the network performance of cellular mobile communication systems. In this paper, we propose new spatial spectrum and energy efficiency models for Poisson-Voronoi tessellation (PVT) random cellular networks. To evaluate
Ge, X +11 more
core +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 Learning-Based Cellular Random Access Framework
IEEE Transactions on Wireless Communications, 2021 Random access (RA) or preamble collision is one of the crucial problems in massive internet-of-things (IoT) at the network entry stage. Since a massive number of IoT nodes simultaneously attempt RAs on the same physical random access channel (PRACH ...
H. Jang +3 more
semanticscholar +1 more source
Grant-Free Random Access in Machine-Type Communication: Approaches and Challenges [PDF]
IEEE wireless communications, 2020 Massive machine-type communication (MTC) is expected to play a key role in supporting Internet of Things (IoT) applications such as smart cities, smart factories, and connected vehicles through cellular networks. MTC is characterized by a large number of
Jinho Choi, Jie Ding, N. Le, Z. Ding
semanticscholar +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
Tensor-Based Modulation for Unsourced Massive Random Access [PDF]
IEEE Wireless Communications Letters, 2020 We introduce a modulation for unsourced massive random access whereby the transmitted symbols are rank-1 tensors constructed from Grassmannian sub-constellations.
Alexis Decurninge +2 more
semanticscholar +1 more source