Results 11 to 20 of about 604 (109)
IET Communications, 2021 An intelligent‐reflecting‐surface aided multigroup multicast communication system is investigated in this paper. We develop energy‐efficient designs for both the precoding matrix at the base station and passive reflecting beamforming at intelligent ...
Junzhi Wang +2 more
doaj +2 more sources
Transmit Beamforming Optimization Design for Broadband Multigroup Multicast System [PDF]
Mathematical Problems in Engineering, 2015 Spectral efficient transmission techniques are necessary and promising for future broadband wireless communications, where the quality of service (QoS) and/or max-min fair (MMF) of intended users are often considered simultaneously. In this paper, both the QoS problem and the MMF problem are investigated together for transmit beamforming in broadband ...
Zilong Zhang, Xiaodong Xu, Yanan Wu
openaire +2 more sources
Robust Multigroup Multicast Transmission for Frame-Based Multi-Beam Satellite Systems
IEEE Access, 2018 We investigate robust multigroup multicast transmission for frame-based multi-beam satellite communication systems with full frequency reuse. To mitigate the effect of outdated channel state information (CSI), we first investigate robust multigroup ...
Wenjin Wang +5 more
doaj +3 more sources
Joint User Grouping, Scheduling, and Precoding for Multicast Energy Efficiency in Multigroup Multicast Systems [PDF]
IEEE Transactions on Wireless Communications, 2020 This paper studies the joint design of user grouping, scheduling (or admission control) and precoding to optimize energy efficiency (EE) for multigroup multicast scenarios in single-cell multiuser MISO downlink channels. Noticing that the existing definition of EE fails to account for group sizes, a new metric called multicast energy efficiency (MEE ...
Ashok Bandi +3 more
openaire +5 more sources
Rate-Splitting for Max-Min Fair Multigroup Multicast Beamforming in Overloaded Systems [PDF]
IEEE Transactions on Wireless Communications, 2017 In this paper, we consider the problem of achieving max-min fairness amongst multiple co-channel multicast groups through transmit beamforming. We explicitly focus on overloaded scenarios in which the number of transmitting antennas is insufficient to ...
Clerckx, Bruno, Joudeh, Hamdi
core +4 more sources
Rate-Splitting Multiple Access in Cache-Aided Cloud-Radio Access Networks
Frontiers in Communications and Networks, 2021 Rate-splitting multiple access (RSMA) has been recognized as a promising physical layer strategy for 6G. Motivated by the ever-increasing popularity of cache-enabled content delivery in wireless communications, this paper proposes an innovative ...
Robert-Jeron Reifert +4 more
doaj +1 more source
An Architecture for AoI and Cache Hybrid Multicast/Unicast/D2D With Cell-Free Massive MIMO Systems
IEEE Access, 2023 The leitmotif of this paper aims at providing an architecture for the age of information (AoI) and cache-assisted hybrid multicast/unicast/device-to-device (D2D) transmission with the promising cell-free massive multiple-input multiple-output (MIMO ...
Meng Zhou +6 more
doaj +1 more source
IEEE Access, 2022 To fully utilize the scarce spectrum resources, the downlink device-to-device (D2D) underlaid multigroup multicast cell-free massive multi-input multi-output (MIMO) systems is proposed, where the geographically distributed access points (APs) serving ...
Jinwen Li +5 more
doaj +1 more source
Satellite-Assisted Cell-Free Massive MIMO Systems with Multi-Group Multicast
Sensors, 2021 In this paper, we use satellite-assisted and multi-group multicast mechanisms to relieve ground traffic pressure and improve data transmission efficiency of cell-free massive MIMO systems.
Jiamin Li +4 more
doaj +1 more source
IET Communications, Volume 17, Issue 2, Page 171-182, January 2023., 2023 Abstract In this article, robust beamforming (BF) and artificial noise (AN) design method is proposed for multiuser broadcast secure transmission under secrecy outage probability (SOP) constraints. A special scenario is assumed that the transmitter cannot obtain the accurate channel state information (CSI) of the users' channel, and different users ...
Li Yao +3 more
wiley +1 more source