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Backscatter wireless communication (BWC) is a promising research area for the low power Internet of Things (IoT) devices. A substantial number of research works have been conducted in this area to increase the range of BWC. Along with physical layer achievements in BWC, an efficient medium access control (MAC) protocol is mandatory to attain the optimal benefit. In this paper, a novel MAC protocol...
The recent widespread use of high-performance terminal equipment has resulted in a rapid increase in the mobile data traffic. Therefore, public wireless local area networks (WLANs) are being used often to supplement the cellular networks. However, the effective throughput degrades significantly when many users connect to a single access point (AP). To overcome this problem, the GBR service should...
Wireless video streaming for multi-view plus depth (MVD) frames enables free viewpoint video on wireless devices, where a viewer can freely synthesize any preferred virtual viewpoint from the received MVD frames. To transmit MVD frames over wireless links, existing schemes use digital-based compression to achieve better compression efficiency. However, the digital-based schemes have an issue called...
In recent years, as higher performance terminal equipments are spread, the amount of mobile data traffic is growing rapidly by using popularization of streaming services in wireless networks. To overcome this situation, it is considered that Access Points (APs) are deployed densely for capacity improvement. In such an environment, virtualization is a possible technique to use multiple APs efficiently...
Coexistence between ZigBee and WiFi technologies, which operate within the same frequency band, is increasing with the widespread use of the IoT (Internet of Things). ZigBee devices suffer significant decrease in the sink arrival rate of packets in the presence of WiFi interference. To overcome this problem, many channel control methods have been proposed. The existing methods switch only ZigBee channels...
Screen-camera communication, which uses a liquid crystal display (LCD) screen and camera image sensors, has been an attractive variant of visible light communications (VLC) since display and camera have been equipped with in various mobile devices. To improve transmission rates, we investigate the impact of nonlinear channel equalization and nonbinary channel coding as well as high-order modulation...
Full-duplex (FD) wireless communication is a key technology for enhancing the capacity of next- generation wireless networks. Previous studies have investigated FD wireless communication medium access control (MAC) schemes to double the existing network capacity. However, energy consumption and power saving mode (PSM) in wireless FD infrastructure networks have not been discussed extensively. Current...
Progressive download for multi-view video delivery is one of promising techniques to provide immersive and interactive experiences to users. In conventional multi-view video systems, a user downloads videos of all viewpoints of one content to realize smooth view switching. However, it causes increase of video traffic, and thus low video quality within an available download rate. To download only a...
We propose and evaluate a dynamic spectrum assignment method to reduce spectrum fragmentations and an adaptive resource sharing method to improve resource utilization efficiency for elastic optical packet and circuit integrated networks.
The security problem of screen image leakage on a cathode-ray tube (CRT) through electromagnetic radiation from several meters away, “transient electro-magnetic pulse emission surveillance technology” (TEMPEST), has attracted wide interest by security researchers since Van Eck wrote about this problem. On the industry side, the problem is considered a serious risk, especially for computers used in...
Recent works on enhancing comfortability and convenience in vehicles reveal that information collections by various wireless sensor nodes have the potential due to their easiness of install and their small size. However, the conventional wireless network standards achieve insufficient reliability for practical in-vehicle communications. In this paper, through implementing 2.4GHz devices in an actual...
Current half duplex wireless communications are reaching the Shannon limit. Previous works have studied fullduplex (FD) wireless communications medium access control (MAC) schemes to double a communication capacity. However, general analysis and guideline for FD wireless communications MAC protocols design have not been shown. In this paper, the role of MAC in FD communication enabled wireless network...
Wheelchairs are the most widely used assistive device to aid activities of daily living (ADL) for disabled people. However, manual pushing of a wheelchair frequently leads to overuse of upper extremities causing shoulder pain and carpal tunnel syndrome. The purpose of this study was to test a novel method of estimating temporal parameters of wheelchair propulsion using inertial sensors. In this paper,...
Recent advancements in antenna design and signal processing have made it feasible to transmit and receive at the same time by using same carrier frequency, which is called in-band full-duplex (IBFD) wireless communications. Along with physical layer advancements, efficient medium access control (MAC) design is required to achieve optimum benefit from this latest technology. In this paper, a full-duplex...
Microwave-assisted biomass reactions are strongly dependent on the dielectric properties of the sample materials. We employed basic solvent and powdery metal oxides as representative slurry. Therefore, the permittivity and loss factors of both the basic solvent and slurry were measured within the frequency range of 200MHz to 20 GHz. In this study, the coaxial probe method was employed and this method...
Ru(II) and Ir(III) complexes are important functional materials with their phosphorescent properties. Ir(III) complexes are used as excellent dopants for OLED and Ru(II) complexes as good oxygen sensors.
In this paper, we propose a congestion control method for low-cost M2M devices in wireless multi-hop networks. By adding the packet priority to each packet and changing it dynamically at intermediate devices, this method considers the requested quality level for each service. Finally simulation results show the excellent performance of the proposed method.
Association rule mining discovers patterns of co-occurrences of attributes as association rules in a data set. The derived association rules are expected to be recurrent, that is, the patterns recur in future in other data sets. This paper defines the recurrence of a rule, and aims to find a criteria to distinguish between high recurrent rules and low recurrent ones using a data set for software defect...
The multi-view video streaming is one of promising technologies for emerging video services. For those applications of multi-view video streaming, video frames of all viewpoints, i.e., cameras, are needed to be transmitted to viewers because the demands of all the viewers' view-switching are unpredictable. However, existing transmission schemes are highly vulnerable to frame loss. Specifically, the...
Soft video delivery, i.e., analog video transmission, has been proposed to provide graceful video quality in unstable wireless channels. However, existing analog schemes need to transmit a significant amount of metadata to a receiver for power allocation and decoding operations. It causes large overheads and quality degradation because of rate and power losses. To reduce the overheads while keeping...
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