Results 81 to 90 of about 604 (109)
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Linear Transmit Beamforming Techniques for the Multigroup Multicast Scenario
IEEE Transactions on Vehicular Technology, 2009In the context of next-generation wireless systems, it is expected that services targeted at mass content distribution will become widely popular. Multicast services, such as audio/video streaming and mobile television, have the characteristic that the same information has to be transmitted to a group of recipients, which may include user terminals as ...
Yu. Silva, A. Klein
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On the Performance of Multigroup Multicast Cell-Free Massive MIMO
IEEE Communications Letters, 2017We investigate the performance of a multigroup multicast cell-free massive multiple-input multiple-output system where many access points (APs) multicast signals to many groups of users. A distributed conjugate beamforming with short-term power constraint (STPC) policy is proposed to use at the APs.
Toan X. Doan +3 more
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Energy-Efficient RSMA for Multigroup Multicast and Multibeam Satellite Communications
IEEE Wireless Communications Letters, 2023Huanxi Cui +4 more
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Multigroup Multicast Transmission via Intelligent Reflecting Surface
2020 IEEE 92nd Vehicular Technology Conference (VTC2020-Fall), 2020Intelligent reflecting surface (IRS) has recently attracted increasing research interests due to its great potential in enhancing the energy and spectrum efficiency for wireless networks. In this paper, we shall investigate the downlink transmit power optimization problem for an IRS-assisted multigroup multicast system, where the beamformers at the ...
Ding Li +3 more
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Robust Transmit Beamforming for Multigroup Multicasting
2012 IEEE Vehicular Technology Conference (VTC Fall), 2012This paper addresses a robust downlink beamforming optimization problem for the multigroup multicast scenario, when only imperfect channel state information (CSI) is available at the transmitter. We consider two different optimization criteria: minimizing the total transmit power subject to quality of service (QoS) constraints at each receiver; max-min
Zhenyuan Chen, Wenyi Zhang, Guo Wei
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D3M: Distributed multi-cell multigroup multicasting
2016 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2016The paper studies the max-min fair multicast multigroup beamforming problem in a multi-cell environment, with perfect (instantaneous or statistical) Channel State Information (CSI). We propose a new general distributed algorithmic framework based on INner Convex Approximations (INCA): the nonsmooth NP-hard problem is replaced by a sequence of smooth ...
Song, P. +3 more
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Resource Efficiency Optimization for Robust Multigroup Multicast Satellite Communications
2021 IEEE International Conference on Communications Workshops (ICC Workshops), 2021The tradeoff between the energy efficiency (EE) and spectral efficiency (SE) provides a new perspective for the transmit design in satellite communications (SATCOM). Motivated by the fact that it is challenging to obtain accurate channel state information at the satellite, we study the EE and SE tradeoff for the robust beamforming in multi-beam SATCOM ...
Linna Gao +4 more
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Artificial noise-aided secure beamforming for multigroup multicast
2018 15th IEEE Annual Consumer Communications & Networking Conference (CCNC), 2018We investigate the physical layer security for multiple-input single-output (MISO) multigroup multicast system in the presence of multiple eavesdroppers (Eves). To elaborate, we aim to tackle the secrecy rate maximization (SRM) problem of the multicast system by proposing an algorithm for secure beam-forming.
Wanjik Kim +3 more
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Dynamic reconfiguration in multigroup multicast routing under uncertainty
Journal of Heuristics, 2017Motivated by high quality multimedia and remote collaborative environments, we solve the problem of multigroup multicast routing with a~number of features important for real-world deployment of the interactive media technologies. Based on the ant colony optimization metaheuristic, our algorithm is the first to work with uncertain knowledge of ...
Pavel Troubil, Hana Rudová, Petr Holub
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Full-Duplex Cooperative Rate-Splitting for Multigroup Multicast With SWIPT
IEEE Transactions on Wireless Communications, 2022We propose a full-duplex cooperative rate-splitting (FD-CRS) scheme in a downlink two-group multicast system. At the transmitter, two distinct messages requested by the two groups respectively are split and then encoded into one common stream and two private streams, based on the principles of rate splitting multiple access (RSMA).
Tiantian Li +3 more
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