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In this paper, we investigate a new power allocation scheme for a multi-user orthogonal frequency division multiplex (OFDM) system, in which two cooperative power sources (CPS) coordinately transmit their power to multiple orthogonal subchannels. In order to maximize the sum rate, a closed form solution is obtained by analytical derivation. Based on the derived solution, we present a novel joint optimal...
In this paper, we focus on the problem of constructing an information gain model for stroke prevention in Ubiquitous Healthcare (U-Health) Wireless Body Area Networks (WBANs). We have constructed an information-based probabilistic relation model among the key indicators and sequenced their data gathering priority and precedence in the WBAN. Then, we constructed a cost function over the energy expenditure...
This paper presents the design and implementation of a novel reconfigurable mobile sensor network system for rough terrain. The proposed system is composed of modular robotic nodes that can be physically connected and disconnected to transform into various configurations. Therefore, they can adapt to changing terrain conditions in real-world applications. The nodes communicate with each other through...
Most traditional mobile robots have always had problems when working in obstacle-dense environments and rough terrain. Inspired by the locomotion mode of locust, this paper presents the design of a novel jumping robot. Rationality of the design and the performance of the jumping mechanism have been verified by strength analysis and kinematic modeling.
To roam between homogeneous or heterogeneous wireless networks, such as prevalent WiFi and 3.5G or emerging WiMAX, a mobility management plays an important role to provide users ubiquitous Internet access and seamless connections. Most of techniques in mobility management focus on shortening the delay of roaming from one wireless domain to another. Pre-registration is one of cross-layer methods to...
With the development of wireless sensor networks, energy supplying problem become critical. One solution method is energy scavenging technology which harvest energy existed in environment, such as solar, vibration, air flow, temperature difference, ambient electromagnetic fields and etc. In substations, the method harvesting energy from the electric field to power sensor nodes is adopted because it's...
Localization is one of the most challenging and important issues in wireless sensor networks (WSNs), especially if cost-effective approaches are demanded. Range estimation is essential in many sensor network localization algorithms. Although wireless sensor systems usually have available received signal strength indication (RSSI) reading, but RSSI is susceptible to external influences, performances...
To support emerging pervasive computer applications, efficient data access and information sharing is essential in mobile wireless environments. The data-centric storage approach provides energy-efficient data dissemination and organization. However, wireless devices have limited storage and are energy-constrained. To address these issues, we introduce the concept of content caching networks, in which...
In this paper, we propose a dynamic association mechanism that takes load balancing, link quality and association oscillation avoidance into consideration. The metric introduced in this association mechanism measures the real-time traffic load through channel based load detection and suits both coordinated and uncoordinated wireless mesh networks. Because of the random characteristics of wireless...
In this paper, we propose a cost-effective scheme for robust wireless multi-party video conferencing based on network coding (NC). The main idea is the adoption of a NC scheme to enhance robust transmission, to simplify the erasure protection procedure, and to reduce the downlink bandwidth by leveraging the properties of opportunistic NC and wireless broadcasting. We design a pipelining schedule to...
A passive filter often becomes a key component in radio frequency (RF) receivers. Analytical component modeling of passive filter suitable for RF front-end applications is dealt with. This analytical analysis has been used to calibrate the optimal values of passive components in order to obtain the maximum image rejection. In this paper, the formula of calculating the gradient vector and the Hessian...
The information is an effective approach to raise the level of plant management in modern enterprises. Aimed at the problem that most of the enterprises face wire-monitoring, so starting with the work in plant running management and adopting the technology of WSN, and analyzes deeply the based on wireless sensor network in plant running management. By collecting plants states signal in WSN, get monitoring...
In this paper, oil and gas wells intelligent wireless monitoring system can real-time on-line and remotely monitor the information of flux, pressure and temperature in the oil pipelines fluid, can achieve the efficient management of data and sharing of resources, and can realize the enterprise managementpsilas automation and information. The users have shown that the system is running in good condition...
With the success of wireless technologies, standard wireless technologies are envisioned for the development in industrial environments as well. The paper discusses and analyzes the feasibility and method of applying the wireless communication technology in the industrial network system. In wired environments, anti-jamming and security are well catered for industrial systems. But when wireless links...
Frequency-domain equalization (FDE) is an effective technique that exhibits the property of relatively low complexity growth with increasing the number of symbols of dispersion in multipath propagation environments for broadband wireless communications compared with the conventional time-domain equalization (TDE). However in practical broadband wireless communications, there exists not only multipath...
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