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Many wireless networks operate in the presence of distance-dependent path–loss in a fading environment with a Poisson interference field. In these networks, the aggregate interference can be modeled as an α-stable process with a known characteristic function. In this study, the authors revisit performance analysis of wireless systems operating in a Nakagamim fading channel. In particular, our emphasis...
This paper describes the state of the art of indoor positioning. It describes the Wi-Fi auto-calibration phase of a fast and adaptive algorithm to calculate the position of access-points in a heterogeneous environment such as a building, house or flat. Our proposal can track a mobile terminal in a building with a minimum of preparation. This deployment simplicity relies on the auto-calibration phase...
Recent development of wireless communication systems and standards is characterized by constant increase of allocated spectrum resources. Since lower frequency ranges cannot provide sufficient amount of bandwidth, new bands are allocated at higher frequencies, for which operators might resort for deploying more base stations to ensure the same coverage. Connecting increased number of base stations...
Digital dividend refers to the additional vacant spectrum that will be available as a result of transition from analogue to digital terrestrial television broadcasting. Wireless broadband networks such as Long-Term Evolution (LTE) can operate opportunistically in this vacant spectrum by controlling the harmful interference and overheads incurred on licensed users. With the objective of analyzing the...
The recent advances in wireless energy transfer technology provide a promising way to solve the problem of limited battery capacity of sensor nodes in wireless sensor networks. Adoption of mobile charger in the wireless rechargeable sensor networks (WRSNs) makes it easier to charge sensor nodes rather than charging with energy harvesting schemes. However, many existing energy replenishment schemes...
Regarding the 300 GHz band radio communication technology aiming at 100 Gbit/s, we report on the background, standardization activities, current status of Research & Development programs conducted in Japan.
With the success of 4th generation of mobile communication, known as LTE, there is an increasing demand for additional spectrum to be made available to mobile network operator worldwide. However, spectrum is a finite resource and local regulators have only a limited – if at all – amount of frequencies available that could be auctioned off to service providers. Therefore, the industry is exploring...
With the rapid development of mobile Internet, the ways in which users access the network become diverse, which provides much convenience for us to collect huge amount of users' behavior information. In this paper, we combine data acquisition based on wireless access and brand analysis innovatively. This paper analyzes proportions of mobile terminal brands on campus using the data collected from WiCloud...
This paper reviews different wireless enterprise architecture standards to enable public safety voice communication interoperability using two-way radio. Different consoles and other means of third party between receiver and transmitter were used. The paper makes individual brief study to those solutions to compare between then, their optimal working areas and tabulates the results.
Hyper-dense network is a promising solution to the high mobile video traffic. However, it has some fundamental problems. To address these issues, we propose a novel information-centric cooperative video transmission strategy in hyper-dense networks via caching. In the proposed scheme, each video file is encoded into segments using maximum distance separable rateless code. Then, a portion of each segment...
The past decade has seen incredible growth in wireless consumption with newly emergent technologies such as the Internet of Things (IoT) slated to radically increase wireless network demands. A significant body of research has operated from the perspective of viewing the Quality of Experience (QoE) of the user as paramount with the network and protocols viewed as a service to accomplish those goals...
In this paper, we call for a paradigm shift away from the wireless-access focused research efforts on 5G networked systems. We believe that the architectural limitations should share equal blame on issues of performance, reliability, and security. We thus identify architectural weakness on both sides of the mobile clients and the 4G network infrastructure. Our recent findings show that, contrary to...
In recent years, the wireless sensor network (WSN) has become more and more popular, and the problem of WSN localization has attracted great attention. In non-line of sight (NLOS) propagation conditions, the localization is less accurate than in line of sight (LOS) propagation conditions because of the buildings between the mobile station and the base station obstruct the spread of waves. In order...
Existing power and rate control methods for wireless communication networks aim to maximize the system capacity and the network throughput, and attempt to increase the quality-of-service (QoS), but cannot guarantee the QoS. This paper presents a new power and rate control method for wireless communication networks, which is based on the priority of QoS, so the QoS can be guaranteed. A dual closed-loop...
This paper proposes a novel approach for visual query compression with a bank of transforms selected on Grassmann manifold. Instead of using single transform and quantization pipeline for all the features extracted from an image, we group the key point features according to their local embedding subspace geometry and organize them into different leaf nodes of a KD-Tree which was built from a large...
Wireless Sensor Networks (WSNs) use mobile actuators for data gathering, which can effectively reduce the energy loss caused by data forwarding and prolong the network lifetime. However, mobile data gathering can't fundamentally change the fact that the energy of sensor nodes is limited. In this paper, to reduce the energy consumption due to data forwarding in wireless sensor networks, an emergency...
Wireless communications is one of the fastest growing technology fields, driving numerous other innovations in electronics. One challenging research area within the wireless field is to achieve a higher transmission speed. Today it is an open question how we can realize a wireless system at a speed of 100 Gb/s or even beyond. If we intend to use such systems in a mobile environment, we can only afford...
Real-time video performance is difficult to guarantee under mobile communication environments characterized by loss-probability-varying transmission channel, heterogeneous networks, and various mobile devices of different access capabilities. In this paper, a novel attention-based network-aware robust video coding scheme mixing adaptive intra refresh with reference picture selection is proposed to...
The paper will develop a wireless sensor network suitable for the medical scene of smart community for the elderly in the community to provide quality health care services for the elderly. The project will improve positioning accuracy of the elderly in the smart community through the study of positioning algorithm. Meanwhile, the project will design a routing protocol most appropriate for medical...
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