Results 61 to 70 of about 6,700 (214)
International Journal of Satellite Communications and Networking, Volume 44, Issue 1, Page 47-59, January/February 2026.The performance limitation in multiple‐input multiple‐output (MIMO) feeder links due to time and phase misalignment of the ground stations is investigated. Time and phase distribution over optical fiber is considered as an approach to achieve the synchronization requirements.
Eriserdi Mollaymeri +2 more
wiley +1 more source
Adaptive Beam Pattern Selection and Resource Allocation for NOMA-Based LEO Satellite Systems [PDF]
, 2022 The low earth orbit (LEO) satellite system is one of the promising solutions to provide broadband services to a wide-coverage area for future integrated LEO-6G networks, where users' demands vary with time and geographical locations.
WANG, Anyue +7 more
core +1 more source
Acta Crystallographica Section B, Volume 82, Issue 1, Page 68-77, February 2026.In lacunary apatite structure‐type Pb4Na(PO4)3, residual density attributable to the deformed 6s2 electron cloud is found in the vicinity of A2‐site Pb2+ on regular A2 triangle normal to c. Systematic comparison on the size of the A2 triangle with other apatite‐type compounds indicates limited stereochemical activity of the orbital.Single crystals of ...
Kotomi Hirano, Hiroki Okudera
wiley +1 more source
SensorsSixth-generation (6G) wireless networks demand a more efficient implementation of non-orthogonal multiple access (NOMA) schemes for severe multipath fading environments to serve multiple users.
Shivani Dixit +4 more
doaj +1 more source
Impact of clipping noise on the sum rate of NOMA with PD-DCO-OFDM and conventional DCO-OFDM
Heliyon, 2020 sIn visible light communication (VLC) systems, a non-orthogonal multiple access (NOMA) scheme is deemed promising technology to offer better spectral efficiency than the Orthogonal multiple access (OMA) scheme.
Zelalem Hailu Gebeyehu
doaj +1 more source
Robust Spectral and Energy Efficiency Tradeoff for RIS‐Aided Multi‐User Communication
IET Communications, Volume 20, Issue 1, January/December 2026.In this work, an RIS‐aided multi‐user network with imperfect CSI is investigated. Correspondingly, we focus on balancing SE and EE through the collaborative design of the base station (BS)'s precoding matrix and the RIS's phase shifts, which consider the transmit power budget and the channel uncertainties constraints.
Xiandeng He, Yilin Wang, Shun Zhang
wiley +1 more source
IEEE Open Journal of the Communications Society, 2021 In the past few years, a large body of literature has been created on downlink Non-Orthogonal Multiple Access (NOMA), employing superposition coding and Successive Interference Cancellation (SIC), in multi-antenna wireless networks.
Bruno Clerckx +9 more
doaj +1 more source
A Massive Grant‐Free Random Access Scheme Based on Spectrum Sensing and Preamble Delay
IET Communications, Volume 20, Issue 1, January/December 2026.This paper introduces cognitive radio (CR) and preamble delay (PD) to reduce access collisions, together with non‐orthogonal multiple access (NOMA) to improve spectrum efficiency, and thus proposes an efficient CR‐NOMA‐PD‐based massive grant‐free random multiple access scheme.
Jing Zhang +5 more
wiley +1 more source
D2D user and cellular user communication scheme based on NOMA
Dianzi Jishu Yingyong, 2023 LTE network adopts non orthogonal multiple access to enhance network capacity and D2D to improve spectral efficiency. Allowing D2D users to share the spectrum resources of cellular users using non orthogonal multiple access technology can alleviate the ...
Zhu Liyuan, Wang Bin, Wang Wennai
doaj +1 more source
Non orthogonal multiple access with wind energy harvesting
, 2023 In this paper, we derive the performance of wireless communications using wind energy harvesting. We study the single-user and multi-user scenarios using Non Orthogonal and Orthogonal Multiple Access (NOMA and OMA).
Hatem Boujemaa, Raed Alhamad
core +1 more source