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In this paper, we propose a positioning system using a time-synchronized wireless network that can achieve high positioning accuracy without being dependent on any global positioning system (GPS) devices with cm-level accuracy as the main goal and objective. The proposed system utilizes time of arrival (ToA) method to estimate the target's position. Based on the results, we can achieve time synchronization...
Integrating different radio access technologies (RATs) is one effective method to meet the demand to provide ever increasing data rates to the users. For integrating LTE and WLAN in particular, the purpose is to enhance the operators control of when the UE uses WLAN. Another aim, in addition to better network control on which RAT is used, is the possible data aggregation which enables simultaneous...
The availability and reasonable cost of broadband Internet made it an attractive and favourable option to billions of users worldwide. Being a fast service also encourages its users to use real-time applications which is streaming and live data transfer includes VoIP and video streaming. The performance of such applications in Wireless Local Area Network (WLAN) may be highly affected by security protocols...
We propose an optimal Physical Layer Convergence Procedure Protocol Data Unit (PPDU) duration algorithm that divides a long data stream into two portions among consecutive groups based on the average PPDU duration of the Very High Throughput (VHT) group. The proposed solution considers all Wireless Local Area Network (WLAN) parameters and satisfies requirements of the VHT Multi-User Multiple Input...
The possibility of extending real-time Ethernet networks employed in industrial applications with wireless links can lead to several benefits in terms of cost reduction and easier deployment. However, delays and jitter introduced by both the wireless medium and the interconnection systems may degrade the network performance significantly. This paper describes the advantages introduced by the IEEE...
Nowadays, millimeter-wave communication centered at the 60 GHz radio frequency band is increasingly the preferred technology for near-field communication since it provides transmission bandwidth that is several GHz wide. The IEEE 802.11ad standard has been developed for commercial wireless local area networks in the 60 GHz transmission environment. Receivers designed to process IEEE 802.11ad waveforms...
IEEE 802.11n/ac wireless local area network (WLAN) supports frame aggregation, called aggregate medium access control (MAC) protocol data unit (A-MPDU), to enhance MAC efficiency by reducing protocol overhead. However, the current channel estimation process conducted only once during the preamble reception is known to be insufficient to ensure robust delivery of long A-MPDU frames in mobile environments...
In this paper, an analytical model is developed to study the performance of distributed and opportunistic multichannel bonding in IEEE 802.11ac WLANs, with co-existing legacy IEEE 802.11a/b/g users. By modeling the transmissions of legacy users and ac users with and without channel bonding in each channel as a two-level renewal process, the channel bonding probability of ac users in each secondary...
In this work we aim at providing an initial analysis of the IEEE802.11s amendment that introduced support for mesh networking to Wireless LAN specifications. Indeed, there has been an increasing interest in the adoption of IEEE 802.11-based wireless systems also in the field of Distributed Measurement Systems (DMSs). Nonetheless, in such a scenario it is necessary to investigate the obtainable performance,...
We have conducted an empirical study of the latest 5GHz IEEE 802.11wireless LAN (WLAN) variants of 802.11n (5GHz) and 802.11ac (Wave 1), underdifferent cell load conditions. We have considered typicalconfigurations of both protocols on a Linux testbed. Under light load, there is no clear difference between 802.11n and 802.11ac in terms ofperformance and energy consumption. However, in some cases of...
We provide an empirical evaluation of an IEEE 802.11ac Wireless Local Area Network (WLAN) cell with Multiple User Multiple Input Multiple Output (MU-MIMO) technology. We conducted our experiments on a testbed comprising consumer equipment under different office scenarios using 40MHz and 80MHz channels. This is the first performance study of MU-MIMO with 802.11ac in an operational scenario using a...
This paper proposes a fast and low-complexity retransmission scheme for Industrial WLAN system. The proposed scheme exploits the frequency diversity and employs channel selectivity in order to achieve high-reliability and low-latency communication. The channel selectivity is carried out instantly by re-scheduling sub-carrier allocation during OFDM transmission in order to obtain diversity gain. Evaluation...
Wireless local area network (WLAN) uses carrier sens multiple access with collision avoidance (CSMA/CA) to share wireless medium. However, in dense WLAN environment, it occurs interference between WLAN nodes such as access points (APs) and stations (STAs). For resolving this problem, we propose management of WLAN APs by using open network operating system (ONOS) controller which is one of software...
A Wireless Local Area Network otherwise as WLAN gives a flexible data communication system rather than using a wired LAN within a building. It uses radio frequency to transmit and receive data which minimizes the need for wired connections. The intention of this paper is to evaluate the performance of WLAN protocol network IEEE802.11n with the data rate of 2.4GHz which is achieved by using optimized...
The latest IEEE WLAN 802.11ad standard guarantees the multi giga bit throughput which is highest in the Wireless LAN (WLAN) technology. The system designed for such high performance will pose enough design challenges to make them consume low power. This can however be achieved by adopting low power management and control block in the digital part of the System on Chip (SoC) like Medium Access Control...
One of the main challenges on the next generation local wireless networks lies in providing scalable media access control protocols in order to support the predicted high density. Research results have indicated that the current backoff mechanism is ineffective for dense networks, even more under the foreseen growing charge for the next five years. This paper investigates the proposal of the contention...
In the recent years, wireless technology has arised as a promising alternative to ethernet technology as a transmission medium for industrial automation system. This paper presents our wireless solution for industrial application, which is based on wireless LAN (WLAN) system. In this paper, our proposed system on chip (SoC) design and FPGA implementation for industrial wireless local area network...
The most severe challenge faced by the wireless networks in supporting real time communications is sharing of wireless channel. A Wireless Token Passing Network (WTPN) is the one that utilizes token passing approaches for sharing the wireless medium. The token passing approaches are characterised by passing the tokens in the wireless local area network and the station that holds the token gets the...
One of the greatest challenges facing 802.11 wireless local area network (WLAN) is to provide equivalent security to wired local area network (LAN). Wi-Fi Protected Access II (WPA-II), also referred to as IEEE 802.11i standard, is the current security mechanism for enterprise wireless networks. IEEE 802.11i standard depends upon IEEE 802.1X standard to authenticate and generate the main cryptographic...
The explosion of diverse Machine to Machine (M2M) services and applications may lead to undesired service interaction. While the service interaction problem is thoroughly studied for telecommunication services, there is a lack of knowledge about the manifest of service interaction in M2M communications. The paper presents a model of connectivity management of M2M devices and formal definition of value...
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