نتایج جستجو برای: successive convex approximation sca

تعداد نتایج: 282150  

Journal: :IEEE Internet of Things Journal 2023

In this article, we propose a state-of-the-art downlink communication transceiver design for transmissive reconfigurable metasurface (RMS)-enabled simultaneous wireless information and power transfer (SWIPT) networks. Specifically, feed antenna is deployed in the RMS-based transceiver, which can be used to implement beamforming. According relationship between wavelength propagation distance, sp...

Journal: :Drones 2023

Because of their low expense and ease rapid deployment, unmanned aerial vehicles (UAVs) are frequently applied in wireless networks. Although the channel is able to broadcast, legitimate communications between UAVs ground nodes incredibly susceptible severe security threats, such as malicious jamming eavesdropping. Compared with traditional line-of-sight (LC) model, probabilistic LC (PrLC) mode...

Journal: :IEEE Journal of Selected Topics in Signal Processing 2022

Intelligent reflecting surface (IRS) is a promising solution to build programmable wireless environment for future communication systems, in which the reflector elements steer incident signal fully customizable ways by passive beamforming. In this paper, an IRS-aided secure spatial modulation (SM) proposed, where IRS perform beamforming and information transfer simultaneously adjusting on-off s...

Journal: :IEEE Transactions on Cloud Computing 2021

This paper studies a resource allocation problem where set of users within specific region is served by cloud radio access network (C-RAN) structure consisting base-band units (BBUs) connected to remote heads (RRHs) equipped with large number antennas via limited capacity front-haul links. User association each RRH, BBU and link essential achieve high rates for cell-edge under limitations. We i...

2017
Markku Juntti

This paper focuses on energy-efficient coordinated multi-point (CoMP) downlink in multi-antenna multi-cell wireless communications systems. We provide an overview of transmit beamforming designs for various energy efficiency (EE) metrics including maximizing the overall network EE, sum weighted EE and fairness EE. Generally, an EE optimization problem is a nonconvex program for which finding th...

Journal: :CoRR 2017
Kien-Giang Nguyen Oskari Tervo Quang-Doanh Vu Le-Nam Tran Markku J. Juntti

This paper focuses on energy-efficient coordinated multi-point (CoMP) downlink in multi-antenna multi-cell wireless communications systems. We provide an overview of transmit beamforming designs for various energy efficiency (EE) metrics including maximizing the overall network EE, sum weighted EE and fairness EE. Generally, an EE optimization problem is a nonconvex program for which finding th...

Journal: :IEEE open journal of the Communications Society 2022

This paper investigates multiple parallel federated learning in cellular networks, where a base station schedules several FL tasks and each task has group of devices involved. To reduce the communication overhead, over-the-air computation is introduced by utilizing superposition property access channels (MAC) to accomplish aggregation step. Since all use same radio resource transfer their local...

Journal: :Applied sciences 2023

In the unmanned aerial vehicle (UAV) assisted non-orthogonal multiple access (NOMA) networks, practical hardware impairments (HIs) and resource allocation is still a challenging problem. Most existing research on algorithms for UAV communication considered with ideal condition. However, impact of HIs system performance cannot be ignored, especially in case high bit rates. Considering HIs, most ...

Journal: :IEEE Transactions on Vehicular Technology 2021

By providing spatial diversity gain, the incorporation of multiple antennas into mobile edge computing (MEC) systems can improve transmission performance. Meanwhile, employing energy harvesting (EH) helps enhance system sustainability. In this paper, we focus on multi-input multi-output (MIMO) MEC with EH and studies computation offloading. The design objective is to minimize time average a wei...

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