Results 21 to 30 of about 252,451 (254)
Grant-Free Massive Random Access With a Massive MIMO Receiver [PDF]
2019 53rd Asilomar Conference on Signals, Systems, and Computers, 2019 We consider the problem of unsourced random access (U-RA), a grant-free uncoordinated form of random access, in a wireless channel with a massive MIMO base station equipped with a large number $M$ of antennas and a large number of wireless single-antenna devices (users).
Alexander Fengler +3 more
openaire +2 more sources
Phase Transition Analysis for Covariance-Based Massive Random Access With Massive MIMO [PDF]
IEEE Transactions on Information Theory, 2022 This paper considers a massive random access problem in which a large number of sporadically active devices wish to communicate with a base station (BS) equipped with massive multiple-input multiple-output (MIMO) antennas. Each device is preassigned a unique signature sequence, and the BS identifies the active devices by detecting which sequences are ...
Zhilin Chen +3 more
openaire +2 more sources
Adaptive channel status based access class barring scheme for traffic emergency communication
Dianxin kexue, 2022 In high-density cellular vehicle-to-everything (C-V2X), effective massive access method of cluster communications is the basis to assure the performance index for different services and enhance the spectrum efficiency under limited resource.An improved ...
Jiao WANG, Gongan QIU, Shibing ZHANG
doaj
Massive Uncoordinated Multiple Access for Beyond 5G [PDF]
IEEE Transactions on Wireless Communications, 2022 Existing wireless communication systems have been mainly designed to provide substantial gain in terms of data rates. However, 5G and Beyond will depart from this scheme, with the objective not only to provide services with higher data rates. One of the main goals is to support massive machine-type communications (mMTC) in the IoT applications ...
Mostafa Mohammadkarimi +2 more
openaire +4 more sources
Detection Techniques for Massive Machine-Type Communications: Challenges and Solutions
IEEE Access, 2020 Massive machine-type communications (mMTC) is one of the key application scenarios of fifth generation (5G) and beyond cellular networks. Bringing the unique technical challenge of supporting a huge number of MTC devices (MTCD) in cellular networks, how ...
Roberto B. Di Renna +3 more
doaj +1 more source
Hybrid Space-Frequency Access for Underwater Acoustic Networks
IEEE Access, 2022 Underwater acoustic networks have recently risen as an effective support to several marine and oceanic applications. However, the potential presence of a large number of nodes simultaneously connected has pushed the scientific community to address the ...
Andrea Petroni +6 more
doaj +1 more source
Massive MIMO Unsourced Random Access
CoRR, 2019 We consider an extension of the massive unsourced random access originally proposed by Polyanskiy to the case where the receiver has a very large number of antennas (a massive MIMO base station) and no channel state information is given to the receiver (fully non-coherent detection).
Alexander Fengler +3 more
openaire +2 more sources
Spatio-temporal Modeling for Massive and Sporadic Access [PDF]
IEEE Journal on Selected Areas in Communications, 2021 IEEE Journal on Selected Areas in Communications, accepted to ...
Yi Zhong 0001 +3 more
openaire +2 more sources
High-Speed Railway, 2023 The current High-Speed Railway (HSR) communications increasingly fail to satisfy the massive access services of numerous user equipment brought by the increasing number of people traveling by HSRs.
Anwen Liao +7 more
doaj +1 more source
Rateless Multiple Access: Asymptotic Throughput Analysis and Improvement With Spatial Coupling
IEEE Access, 2018 A novel random code-domain non-orthogonal multiple access (NOMA) framework, rateless multiple access (RMA), is studied in this paper. In RMA, instead of granting each user specific radio resources in a fixed and centralized manner, the access point ...
Zhaoyang Zhang +3 more
doaj +1 more source