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Femtocell and WiFi play crucial roles in sustaining the continued growth in mobile traffic. Deploying Femtocells in WiFi hotspots would allow the access providers to provide more capacity for users and improve their quality of experience during mobility. Hence, the co-existence of Femtocell and WiFi carries critical importance for improving the total performance of the users and meeting the promised...
Current lifestyles promote the development and advancement in wireless technologies, especially in Wireless Sensor Networks (WSN) due to its several benefits. WSN offers a low cost, low data rate, flexible routing, longer lifetime, and low-energy consumption suitable for unmanned and long term monitoring. Among huge WSN applications, some key applications are smart houses, environmental monitoring,...
This paper assesses the interference caused by uncontrolled traffic sources upon real-time traffic in IEEE 802.11s mesh networks. It was considered a mesh network transmitting real-time traffic and an external interference was injected in order to evaluate its impact over the real-time communication. A set of experiments were performed in ns-3 and different scenarios were evaluated, where the end-to-end...
The adoption of dense industrial wireless network technologies in industrial plants is mandatorily paired with the development of methods and tools for connectivity prediction. These can be used to certify the quality (or reliability) of network information flow in industrial scenarios characterized by harsh propagation environments. Connectivity prediction must account for possibly coexisting heterogeneous...
Nowadays, a huge number of WiFi devices are distributed in anywhere place. Because tremendous WLAN devices are transmitting in ISM bands, the interference problem has emerged as an important issue. The simple method to solve the interference problem is to avoid to the other vacant operating channel. However, current ISM band might be already shortage because of operating many WiFi devices. So, the...
Nowadays, the request for wireless services is greatly exploded to receive a good services from internet. So, many APs for WLAN are thoughtlessly deployed in various places. At this environments, inter-basic service set (BSS) interference might be happened. If the APs locating in same overlapped region are operated in the same channel, the CSMA/CA is well worked, that is multiple APs are operated...
The use of wireless networks in industrial environment is growing due to the advantages of these networks compared to wired systems. The WirelessHART protocol was created in 2007, and it's the first open wireless communication standard specifically designed for industrial environments. This protocol has been gaining increasing applicability in industry due to its high reliability and robustness. Because...
The purpose of this paper is to propose an advanced fingerprint-based indoor localization scheme for wireless sensor networks (WSN) to improve the accuracy. Many localization methods have been introduced for WSN systems using wireless signals mainly divided into two categories, which are range-based and range-free. As wireless ranging is not reliable in indoor environment due to multipath fading and...
The spectrum used by wireless sensor networks and smart metering networks is becoming increasingly crowded due to the increasing deployment of IEEE 802.11b/g and Bluetooth devices as well as other co-located wireless sensor networks. Using an energy detection application, this paper presents the statistics of the interfering power levels from typical IEEE 802.11b/g devices, Bluetooth devices and wireless...
In this work we show how to detect ZigBee interference on commodity WiFi cards by monitoring the reception errors, such as synchronization errors, invalid header formats, too long frames, etc., caused by ZigBee transmissions. Indeed, in presence of non-WiFi modulated signals, the occurrence of these types of errors follows statistics that can be easily recognized. Moreover, the duration of the error...
To evade Wi-Fi interference for ZigBee networks, it is required to reliably deliver critical channel-changing instructions under heavy interference. This paper firstly investigates ZigBee transmission performance under real-world Wi-Fi and under controlled high-rate data streams, respectively. Based on the experimental results, a theoretical model and a rough guideline for reliable message delivering...
As the wireless medium is becoming more and more congested, a better use of the scarce frequency spectrum is needed to deliver the required Quality of Service (QoS) to clients. Especially in unlicensed bands, wireless systems suffer from intra-network interference [1], e.g., in professional wireless conferencing environments [2]. Therefore, cognitive solutions are being developed, both on radio and...
Parallel redundant point-to-point transmission utilizing a dual-radio wireless infrastructure has been identified as a powerful approach to improve the performance of wireless communication. This method can be applied for every existing wireless standard, but has not been deeply researched so far. To fill this gap, an OMNet++ simulation model for IEEE 802.11g (Wi-Fi) and IEEE 802.15.4 (ZigBee) is...
To allow users to access networks and services ubiquitously, more and more user equipments (UEs) are equipped with multiple radio transceivers. However, due to the proximity of transmit and receive frequencies of in-device wireless technologies, the transmitter (TX) of one in-device wireless technology can interfere with the reception of another wireless technology within the same device, and the...
Over the past ten years, many solutions have been proposed to address the problem of access point selection in IEEE 802.11 Wi-Fi networks. The standard, which recommends that user devices select an access point based on received signal strength (RSS) has many shortcomings and leads to poor performance. Many of the solutions proposed lead to better performance under some circumstances and with a particular...
Wireless body area network (WBAN) witness an upward interest in several domain. Mainly, the medical domain takes advantages from the health service facility, the high flexibility and the mobility. However, interferences from coexisting wireless networks may lose critical informations and greatly affect on network reliability. In this paper, we are conducting to improve coexistence between WBAN based...
Interference management is an important subject in Device to Device (D2D) communication when underlying a LTE-A cellular band. By default, in LTE-A there is negligible intra-cell interference due to the orthogonality of the subcarriers but this orthogonality will be lost when D2D communication takes place under cellular users (CU). Therefore, one of the key aspects of D2D communication is the set...
Directional Medium Access Control protocols (DMACs) have been studied for decades. Since most existing DMACs assume an ideal antenna model which does not consider the minor-lobe interference, their performance cannot be guaranteed in practice. Other approaches assuming non-ideal antenna require either extra equipment or clock synchronization, making the system more complicated. It is also observed...
We propose a novel regression, which is called Twin Support Vector Regression (TSVR) to improve the precision of indoor positioning. Similar as Support Vector Regression (SVR), there are 6 parameters to be identified. However, compared with SVR, less computation time and approximate performance can be achieved with TSVR. Genetic Algorithm (GA) is used to avoid local optimum in indoor positioning to...
While many metropolitan areas sought to deploy city-wide WiFi networks, the densest urban areas were not able to broadly leverage the technology for large-scale Internet access. Ultimately, the small spatial separation required for effective 802.11 links in these areas resulted in prohibitively large up-front costs. The FCC has reapportioned spectrum from TV white spaces for the purposes of large-scale...
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