Δημοσιεύσεις
Conferences
Christos Bouras; Ioannis Prokopiou; Apostolos Gkamas; Vasileios Kokkinos
Performance Analysis of MIMO using Machine Learning in 5G Networks Best Paper Conference
The Eighteenth International Conference on Wireless and Mobile Communications (ICWMC 2022), May 22 – 26, 2022, Venice, Italy, pp. 1-6 , 2022.
Abstract | Links | BibTeX | Ετικέτες: Best Paper
@conference{4585,
title = {Performance Analysis of MIMO using Machine Learning in 5G Networks},
author = {Christos Bouras and Ioannis Prokopiou and Apostolos Gkamas and Vasileios Kokkinos},
url = {https://bouras.upatras.gr/performance-analysis-of-mimo-using-machine-learning-in-5g-networks/
https://bouras.upatras.gr/iwcmc_2022_contribution_20007_cr_bouras_updated/},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
booktitle = {The Eighteenth International Conference on Wireless and Mobile Communications (ICWMC 2022), May 22 – 26, 2022, Venice, Italy, pp. 1-6 },
pages = {1 - 6 },
abstract = {Massive Multiple-Input Multiple-output (MIMO) is an important radio antenna technology for mobile wireless networks, such as 5th Generation (5G) with high potential. The use of hybrid analog and digital precoding to minimize the energy consumption as well as the hardware complexity of mixed signal components is an essential strategy. Machine Learning (ML) could be able to boost 5G technologies due to the rising difficulty of configuring cellular networks. More than ever, a ML computational framework focused on successfully processing the expected huge data generated normally by 5G networks with high subscriber cell density, is required. In the Ultra-Dense Networks (UDNs) of 5G and beyond high demanding networks paired with beamforming and massive MIMO technologies, ML struggles to define network traffic aspects distinctively, especially when they are projected to be much more dynamic and complicated. This paper presents a state-of-the-art analysis of the combined and multiple uses of ML along with MIMO technology in 5G Networks.},
keywords = {Best Paper},
pubstate = {published},
tppubtype = {conference}
}
Massive Multiple-Input Multiple-output (MIMO) is an important radio antenna technology for mobile wireless networks, such as 5th Generation (5G) with high potential. The use of hybrid analog and digital precoding to minimize the energy consumption as well as the hardware complexity of mixed signal components is an essential strategy. Machine Learning (ML) could be able to boost 5G technologies due to the rising difficulty of configuring cellular networks. More than ever, a ML computational framework focused on successfully processing the expected huge data generated normally by 5G networks with high subscriber cell density, is required. In the Ultra-Dense Networks (UDNs) of 5G and beyond high demanding networks paired with beamforming and massive MIMO technologies, ML struggles to define network traffic aspects distinctively, especially when they are projected to be much more dynamic and complicated. This paper presents a state-of-the-art analysis of the combined and multiple uses of ML along with MIMO technology in 5G Networks.
Eirini Barri; Christos Bouras; Apostolos Gkamas; Vasileios Kokkinos; Aspasia Koukouvela
Resource Allocation In 5G and Beyond Networks for Mu-MIMO Systems Best Paper Conference
The Twenty - First International Conference on Networks (ICN 2022), April 24 - 28, 2022, Barcelona, Spain, pp. 1-5 , 2022.
Abstract | Links | BibTeX | Ετικέτες: Best Paper
@conference{4584,
title = {Resource Allocation In 5G and Beyond Networks for Mu-MIMO Systems},
author = {Eirini Barri and Christos Bouras and Apostolos Gkamas and Vasileios Kokkinos and Aspasia Koukouvela},
url = {https://bouras.upatras.gr/resource-allocation-in-5g-and-beyond-networks-for-mu-mimo-systems/
https://bouras.upatras.gr/icn_22_final/},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
booktitle = {The Twenty - First International Conference on Networks (ICN 2022), April 24 - 28, 2022, Barcelona, Spain, pp. 1-5 },
pages = {1 - 5 },
abstract = {The resource allocation problem focuses on finding an optimal allocation of a specific number of resources to maintain Quality of Service (QoS). That is where Multiple-Input Multiple-Output (MIMO) come in as a radio antenna technology. In order to, optimize data speed, minimize errors and improve the radio transmission capacity MIMO utilizes multiple antennas at both the transmitter and the receiver. This technology uses a variety of antennas and paths that carry the data. Each antenna uses different paths. Multi-user MIMO (mu-MIMO) stands for a technology that allows routers to communicate simultaneously with multiple endpoint devices and it is the next evolutionary step of single user MIMO. Over the past decade, significant advances have been made to improve the performance of mu-MIMO. Although non-negligible progress has been achieved so far, optimal algorithms for Resource Allocation (RA) will help better the performance of mu-MIMO by increasing the system’s performance in terms of throughput, fairness, and QoS. The purpose of this paper is to provide a comparison of different beamforming techniques used for resource allocation and list them in ascending order depending on their efficiency.},
keywords = {Best Paper},
pubstate = {published},
tppubtype = {conference}
}
The resource allocation problem focuses on finding an optimal allocation of a specific number of resources to maintain Quality of Service (QoS). That is where Multiple-Input Multiple-Output (MIMO) come in as a radio antenna technology. In order to, optimize data speed, minimize errors and improve the radio transmission capacity MIMO utilizes multiple antennas at both the transmitter and the receiver. This technology uses a variety of antennas and paths that carry the data. Each antenna uses different paths. Multi-user MIMO (mu-MIMO) stands for a technology that allows routers to communicate simultaneously with multiple endpoint devices and it is the next evolutionary step of single user MIMO. Over the past decade, significant advances have been made to improve the performance of mu-MIMO. Although non-negligible progress has been achieved so far, optimal algorithms for Resource Allocation (RA) will help better the performance of mu-MIMO by increasing the system’s performance in terms of throughput, fairness, and QoS. The purpose of this paper is to provide a comparison of different beamforming techniques used for resource allocation and list them in ascending order depending on their efficiency.
Eirini Barri; Christos Bouras; Apostolos Gkamas; Spyridon Katsampiris
GuideMe: A system for Indoor Orientation and Guidance Conference
The Seventh International Conference on Smart Portable, Wearable, Implantable and Disability - oriented Devices and Systems (SPWID 2021), May 30 - June 3, 2021, Valencia, Spain, 2021.
Abstract | Links | BibTeX | Ετικέτες: Best Paper
@conference{4536,
title = {GuideMe: A system for Indoor Orientation and Guidance},
author = {Eirini Barri and Christos Bouras and Apostolos Gkamas and Spyridon Katsampiris},
url = {https://bouras.upatras.gr/d6-2/},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
booktitle = {The Seventh International Conference on Smart Portable, Wearable, Implantable and Disability - oriented Devices and Systems (SPWID 2021), May 30 - June 3, 2021, Valencia, Spain},
abstract = {The interest for indoor navigational systems is expanding daily, and concerns among others visually impaired people that cannot navigate safely indoors. The main goal of such systems is to localize and direct the individual that has a wearable device and provide voice commands to navigate indoor buildings. This paper’s aims to present the design and the implementation of the GuideMe project. GuideMe project’s goal is the design, implementation and evaluation of a navigation system focused on people that face troubles in indoor moving, utilizing a wearable device. Specifically, the focus group is people suffering from visual impairment. The person carrying the wearable device takes guidelines about the location from indoor UltraWide Band (UWB) anchors. The commands provided are about indoor direction through voice commands, assisting him to avoid obstacles in his route. We present the architecture and the details of the various modules which consist of the proposed indoor navigation system, and finally, some initial evaluations of the proposed system yield promising results.},
keywords = {Best Paper},
pubstate = {published},
tppubtype = {conference}
}
The interest for indoor navigational systems is expanding daily, and concerns among others visually impaired people that cannot navigate safely indoors. The main goal of such systems is to localize and direct the individual that has a wearable device and provide voice commands to navigate indoor buildings. This paper’s aims to present the design and the implementation of the GuideMe project. GuideMe project’s goal is the design, implementation and evaluation of a navigation system focused on people that face troubles in indoor moving, utilizing a wearable device. Specifically, the focus group is people suffering from visual impairment. The person carrying the wearable device takes guidelines about the location from indoor UltraWide Band (UWB) anchors. The commands provided are about indoor direction through voice commands, assisting him to avoid obstacles in his route. We present the architecture and the details of the various modules which consist of the proposed indoor navigation system, and finally, some initial evaluations of the proposed system yield promising results.
Christos Bouras; Vasileios Kokkinos; Christina Koulouri
Resource Allocation Mechanism for Massive MIMO Best Paper Conference
The Sixteenth International Conference on Networking and Services (ICNS 2020), September 27, 2020 - October 01, 2020 , Lisbon, Portugal, pp. 1-6, 2020.
Abstract | Links | BibTeX | Ετικέτες: Best Paper
@conference{4465,
title = {Resource Allocation Mechanism for Massive MIMO},
author = {Christos Bouras and Vasileios Kokkinos and Christina Koulouri},
url = {https://bouras.upatras.gr/icns2020_2_bouras/
https://bouras.upatras.gr/resource-allocation-mechanism-for-massive-mimo/},
year = {2020},
date = {2020-01-01},
urldate = {2020-01-01},
booktitle = {The Sixteenth International Conference on Networking and Services (ICNS 2020), September 27, 2020 - October 01, 2020 , Lisbon, Portugal, pp. 1-6},
pages = {1 - 6 },
abstract = {Nowadays, mobile users need faster data speeds and more reliable service. The next generation of wireless networks 5G pledges to commit that, and much more. Multiple-Input, Multiple-Output (ΜΙΜΟ) technology in 5G networks is studied in this paper, with emphasis on the achieved performance in terms of achieved Bandwidth. Multi-antenna technologies, such as MIMO, are anticipated to play a key role in 5G systems, as they will have to handle much higher speeds than today’s cellular networks and greater network traffic. Specifically, we will refer to Massive MIMO (Ma-MIMO) technology. In this paper, a resource allocation mechanism is proposed from the Base Station (BS) to the available antennas, using the Knapsack Problem (KP) algorithm. Our goal is to evaluate user access throughput to the antennas and to study the case where the BS allocates resources, according to the channel rate it receives from each User Equipment (UE). The scenario executed is about serving the maximum number of UE connected to the BS, in high quality services. Finally, we simulate the results in MATLAB, in order to be able to evaluate the Quality of Service (QoS) that is provided to the UE by the BS, with the resource allocation technique that is proposed.},
keywords = {Best Paper},
pubstate = {published},
tppubtype = {conference}
}
Nowadays, mobile users need faster data speeds and more reliable service. The next generation of wireless networks 5G pledges to commit that, and much more. Multiple-Input, Multiple-Output (ΜΙΜΟ) technology in 5G networks is studied in this paper, with emphasis on the achieved performance in terms of achieved Bandwidth. Multi-antenna technologies, such as MIMO, are anticipated to play a key role in 5G systems, as they will have to handle much higher speeds than today’s cellular networks and greater network traffic. Specifically, we will refer to Massive MIMO (Ma-MIMO) technology. In this paper, a resource allocation mechanism is proposed from the Base Station (BS) to the available antennas, using the Knapsack Problem (KP) algorithm. Our goal is to evaluate user access throughput to the antennas and to study the case where the BS allocates resources, according to the channel rate it receives from each User Equipment (UE). The scenario executed is about serving the maximum number of UE connected to the BS, in high quality services. Finally, we simulate the results in MATLAB, in order to be able to evaluate the Quality of Service (QoS) that is provided to the UE by the BS, with the resource allocation technique that is proposed.
Christos Bouras; Vaggelis Kapoulas; Apostolos Gkamas; G Kioumourtzis; George Adam
A cross - layer design for video transmission with TFRC in MANETS Best Paper Conference
International Conference on Data Communication Networking - DCNET 2012, Rome, Italy, pp. 5-12, 2012.
Abstract | Links | BibTeX | Ετικέτες: Best Paper
@conference{3005,
title = {A cross - layer design for video transmission with TFRC in MANETS},
author = {Christos Bouras and Vaggelis Kapoulas and Apostolos Gkamas and G Kioumourtzis and George Adam},
url = {https://bouras.upatras.gr/best-paper-award_dcnet-1/
https://bouras.upatras.gr/9394dcnet_2012_5_cr/},
year = {2012},
date = {2012-07-01},
urldate = {2012-07-01},
booktitle = {International Conference on Data Communication Networking - DCNET 2012, Rome, Italy, pp. 5-12},
pages = {5-12},
abstract = {Mobile Ad hoc NETworks (MANETs) are becoming more essential to wireless communications due to growing popularity of mobile devices. However, MANETs do not seem to effectively support multimedia applications and especially video transmission. In this work, we propose a cross-layer design that aims to improve the performance of video transmission using TCP Friendly Rate Control (TFRC). Our design provides priority to video packets and exploits information from the MAC layer in order to improve TFRC?s performance. The proposed cross-layer mechanism utilizes Signal to Noise Ratio (SNR) measurements along the routing path, in order to make the route reconstruction procedure more efficient. Simulation results show that both the use of traffic categorization and the SNR utilization lead to important improvements of video transmission over the mobile Ad hoc network. More specifically, simulations indicate increased average Peak Signal to Noise Ratio (PSNR) for the received video, increased throughput and packet delivery ration, as well as reduced average end-to-end delay.},
keywords = {Best Paper},
pubstate = {published},
tppubtype = {conference}
}
Mobile Ad hoc NETworks (MANETs) are becoming more essential to wireless communications due to growing popularity of mobile devices. However, MANETs do not seem to effectively support multimedia applications and especially video transmission. In this work, we propose a cross-layer design that aims to improve the performance of video transmission using TCP Friendly Rate Control (TFRC). Our design provides priority to video packets and exploits information from the MAC layer in order to improve TFRC?s performance. The proposed cross-layer mechanism utilizes Signal to Noise Ratio (SNR) measurements along the routing path, in order to make the route reconstruction procedure more efficient. Simulation results show that both the use of traffic categorization and the SNR utilization lead to important improvements of video transmission over the mobile Ad hoc network. More specifically, simulations indicate increased average Peak Signal to Noise Ratio (PSNR) for the received video, increased throughput and packet delivery ration, as well as reduced average end-to-end delay.
Christos Bouras; Andreas Papazois; George Tsichritzis; S Ahmad; R Hamzaoui; E Perelman; A Sahni; G Simon
The Community Network Game Project: Enriching Online Gamers Experience with User Generated Content Best Paper Conference
CONTENT 2010: The Second International Conference on Creative Content Technologies, Lisbon, Portugal, pp. 1-6 , 2010.
Abstract | Links | BibTeX | Ετικέτες: Best Paper
@conference{2980,
title = {The Community Network Game Project: Enriching Online Gamers Experience with User Generated Content},
author = {Christos Bouras and Andreas Papazois and George Tsichritzis and S Ahmad and R Hamzaoui and E Perelman and A Sahni and G Simon},
url = {https://telematics.upatras.gr/best_paper_award/
https://telematics.upatras.gr/8935content2010_bouras/},
year = {2010},
date = {2010-11-01},
urldate = {2010-11-01},
booktitle = {CONTENT 2010: The Second International Conference on Creative Content Technologies, Lisbon, Portugal, pp. 1-6 },
pages = {1 - 6 },
abstract = {One of the most attractive features of Massively Multiplayer Online Games (MMOGs) is the possibility for users to interact with a large number of other users in a variety of collaborative and competitive situations. Gamers within an MMOG typically become members of active communities with mutual interests, shared adventures, and common objectives. We present the EU funded Community Network Game (CNG) project. The CNG project will provide tools to enhance col- laborative activities between online gamers and will develop new tools for the generation, distribution and insertion of user generated content (UGC) into existing MMOGs. CNG will allow the addition of new engaging community services without changing the game code and without adding new processing or network loads to the MMOG central servers. The UGC considered by the CNG project includes 3D objects and graphics as well as video to be shared using peer-to-peer (P2P) technology. We describe the concept, innovations, and objectives of the project.},
keywords = {Best Paper},
pubstate = {published},
tppubtype = {conference}
}
One of the most attractive features of Massively Multiplayer Online Games (MMOGs) is the possibility for users to interact with a large number of other users in a variety of collaborative and competitive situations. Gamers within an MMOG typically become members of active communities with mutual interests, shared adventures, and common objectives. We present the EU funded Community Network Game (CNG) project. The CNG project will provide tools to enhance col- laborative activities between online gamers and will develop new tools for the generation, distribution and insertion of user generated content (UGC) into existing MMOGs. CNG will allow the addition of new engaging community services without changing the game code and without adding new processing or network loads to the MMOG central servers. The UGC considered by the CNG project includes 3D objects and graphics as well as video to be shared using peer-to-peer (P2P) technology. We describe the concept, innovations, and objectives of the project.
Christos Bouras; Vassilis Poulopoulos
Dynamic User Context Web Personalization in Meta - Portals Best Paper Conference
The Fifteenth IEEE Symposium on Computers and Communications (ISCC’10), Riccione, Italy, pp. 925-930, 2010.
Abstract | Links | BibTeX | Ετικέτες: Best Paper
@conference{2969,
title = {Dynamic User Context Web Personalization in Meta - Portals},
author = {Christos Bouras and Vassilis Poulopoulos},
url = {https://bouras.upatras.gr/bpa_2-2/
https://bouras.upatras.gr/2689iscc_2/},
year = {2010},
date = {2010-06-01},
urldate = {2010-06-01},
booktitle = {The Fifteenth IEEE Symposium on Computers and Communications (ISCC’10), Riccione, Italy, pp. 925-930},
pages = {925 - 930},
abstract = {We present the dynamic web personalization and document grouping infrastructure for meta-portals and the evaluation of the mechanism on peRSSonal, a system that collects articles from news portals and blogs worldwide. A meta-portal is an informational node where articles from different sources are collected and presented in a categorized and personalized manner. The web personalization mechanism is based on dynamic creation and update of user profile according to the user’s preferences when browsing and on user grouping details. Assuming that required information, such as article tagging, keywords to categories matching and articles to categories relation is already part of the meta-portal we present a novel mechanism that can build and maintain a user profile which is formed without disturbing the user. Furthermore, we describe the real-time user centered document grouping mechanism that is implemented to support the web personalization system and present the experimental evaluation of the whole system.},
keywords = {Best Paper},
pubstate = {published},
tppubtype = {conference}
}
We present the dynamic web personalization and document grouping infrastructure for meta-portals and the evaluation of the mechanism on peRSSonal, a system that collects articles from news portals and blogs worldwide. A meta-portal is an informational node where articles from different sources are collected and presented in a categorized and personalized manner. The web personalization mechanism is based on dynamic creation and update of user profile according to the user’s preferences when browsing and on user grouping details. Assuming that required information, such as article tagging, keywords to categories matching and articles to categories relation is already part of the meta-portal we present a novel mechanism that can build and maintain a user profile which is formed without disturbing the user. Furthermore, we describe the real-time user centered document grouping mechanism that is implemented to support the web personalization system and present the experimental evaluation of the whole system.
Christos Bouras; Vassilis Poulopoulos; Vassilis Tsogkas; Ioannis Sengounis
Networking Aspects for Gaming Systems Best Paper Conference
Third International Conference on Internet and Web Applications (ICIW 2008), Athens, Greece, pp. 650-655, 2008.
Abstract | Links | BibTeX | Ετικέτες: Best Paper
@conference{2920,
title = {Networking Aspects for Gaming Systems},
author = {Christos Bouras and Vassilis Poulopoulos and Vassilis Tsogkas and Ioannis Sengounis},
url = {https://telematics.upatras.gr/networking-aspects-for-gaming-systems/
https://telematics.upatras.gr/3892iciw2008_bouras/},
year = {2008},
date = {2008-06-01},
urldate = {2008-06-01},
booktitle = {Third International Conference on Internet and Web Applications (ICIW 2008), Athens, Greece, pp. 650-655},
pages = {650 - 655},
abstract = {As the evolution of computer technology introduces new advances in networks among others, online gaming becomes a new trend. Following the trends of our era, Games At Large IST Project introduces an innovative platform for running interactive, rich content multimedia applications over a Wireless Local Area Network. Games at Large project?s vision is to provide a new system architecture for Interactive Multimedia which will enhance existing CE devices such as, Set Top Boxes (STB), Small Screen and other devices, which are lacking both the CPU power and the graphical performance to provide a rich user experience. This paper presents the controllers? subsystem of the innovative mechanism that will be implemented in the context of Games at Large project. More specifically, it presents the general architecture of the complete system and focuses on the “capturing” and “execution of commands” modules at the different clients and the remote execution of the commands on server side. The client software captures the input from the different input devices, sends the commands over a Wireless Local Area Network and the server is responsible for receiving and executing the commands to the corresponding application.},
keywords = {Best Paper},
pubstate = {published},
tppubtype = {conference}
}
As the evolution of computer technology introduces new advances in networks among others, online gaming becomes a new trend. Following the trends of our era, Games At Large IST Project introduces an innovative platform for running interactive, rich content multimedia applications over a Wireless Local Area Network. Games at Large project?s vision is to provide a new system architecture for Interactive Multimedia which will enhance existing CE devices such as, Set Top Boxes (STB), Small Screen and other devices, which are lacking both the CPU power and the graphical performance to provide a rich user experience. This paper presents the controllers? subsystem of the innovative mechanism that will be implemented in the context of Games at Large project. More specifically, it presents the general architecture of the complete system and focuses on the “capturing” and “execution of commands” modules at the different clients and the remote execution of the commands on server side. The client software captures the input from the different input devices, sends the commands over a Wireless Local Area Network and the server is responsible for receiving and executing the commands to the corresponding application.