Results 21 to 30 of about 604 (109)
QoE‐Aware Video Delivery in Multimedia IoT Network with Multiple Eavesdroppers
Security and Communication Networks, Volume 2022, Issue 1, 2022., 2022 How to deal with the increasing video traffic and diverse service demands while ensuring the security of transmission is an open issue in the multimedia Internet of Things (IoT). This paper addresses this issue and studies a secure delivery scheme under a multicast scenario in the presence of multiple eavesdroppers where small base stations (SBSs) can ...
Dapeng Wu +7 more
wiley +1 more source
Total and Minimum Energy Efficiency Tradeoff in Robust Multigroup Multicast Satellite Communications
Space: Science & Technology, 2023 Satellite communication is an indispensable part of future wireless communications given its global coverage and long-distance propagation. In satellite communication systems, channel acquisition and energy consumption are two critical issues.
Bin Jiang +9 more
doaj +1 more source
Joint Beamforming Design for Intelligent Reflecting Surface Aided Terahertz Wireless Network
Mathematical Problems in Engineering, Volume 2022, Issue 1, 2022., 2022 This paper investigates the transmission design in a multiple‐input single‐output (MISO) Terahertz network assisted by an intelligent reflecting surface (IRS). Specifically, we consider the sum‐rate maximization design by jointly optimizing the active beamforming (BF) and the phase shifters.
Jinhong Bian +3 more
wiley +1 more source
Wireless Communications and Mobile Computing, Volume 2022, Issue 1, 2022., 2022 The secure communication in reconfigurable intelligent surface‐aided cell‐free massive MIMO system is investigated with low‐resolution ADCs and with the existence of an active eavesdropper. Specifically, an aggregated channel estimation approach is applied to decrease the overhead required to estimate the channels. Using the available imperfect channel
Xianyu Zhang +6 more
wiley +1 more source
Joint User Scheduling, and Precoding for Multicast Spectral Efficiency in Multigroup Multicast Systems [PDF]
2020 International Conference on Signal Processing and Communications (SPCOM), 2020 This paper studies the joint design of user scheduling and precoding for the maximization of spectral efficiency (SE) for a multigroup multicast scenario in multiuser MISO downlink channels. Noticing that the existing definition of SE fails to account for group sizes, a new metric called multicast spectral efficiency (MC-SE) is proposed.
Bandi, Ashok +3 more
openaire +2 more sources
Performance Modeling Analysis of D‐MSMR‐CARQ with Relay Selection in Wireless Sensor Networks
Security and Communication Networks, Volume 2021, Issue 1, 2021., 2021 Reliable and efficient real‐time transmission is an important and challenging issue for wireless sensor networks (WSNs). Truncated retransmission times and relay selection can effectively reduce transmission delay and improve system throughput. A new direct multisource multirelay cooperative automatic repeat request (D‐MSMR‐CARQ) protocol based on ...
Yongqiang Zhou +4 more
wiley +1 more source
Distributed coordinated beamforming for multi-cell multigroup multicast systems [PDF]
2016 IEEE International Conference on Communications (ICC), 2016 This paper considers coordinated multicast beamforming in a multi-cell wireless network. Each multiantenna base station (BS) serves multiple groups of single antenna users by generating a single beam with common data per group. The aim is to minimize the sum power of BSs while satisfying user-specific SINR targets.
Pennanen, Harri +3 more
openaire +3 more sources
Practical KGC‐Free Polynomial‐Based Multiple Group Keys Agreement for IoT Health Care Systems
Mathematical Problems in Engineering, Volume 2021, Issue 1, 2021., 2021 Although nowadays lots of group key agreement schemes have been presented, most of these protocols generate a secret key for a single group. However, in the IoT HCS, more and more communications are involved in multiple groups and users can join multiple groups to communicate at the same time.
Qi Cheng +6 more
wiley +1 more source
Power Control for Multigroup Multicast Cell-Free Massive MIMO Downlink: Invited Paper [PDF]
2021 29th European Signal Processing Conference (EUSIPCO), 2021 Abstract We consider a multigroup multicast cell-free multiple-input multiple-output (MIMO) downlink system with short-term power constraints. In particular, the normalized conjugate beamforming scheme is adopted at each access point (AP) to keep the downlink power strictly under the power budget regardless of small scale fading.
Farooq, M. (Muhammad) +2 more
openaire +4 more sources
On the Achievable Rate of IRS-Assisted Multigroup Multicast Systems
GLOBECOM 2022 - 2022 IEEE Global Communications Conference, 2022 Intelligent reflecting surfaces (IRSs) have shown huge advantages in many potential use cases and thus have been considered a promising candidate for next-generation wireless systems. In this paper, we consider an IRS-assisted multigroup multicast (IRS-MGMC) system in a multiple-input single-output (MISO) scenario, for which the related existing ...
Farooq, M. (Muhammad) +3 more
openaire +3 more sources