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Sensors are pervasively deployed on mobile devices with the development of Internet of Things technology. Value-added services are innovated and developed by analyzing data streams from massive number of mobile sensors in online mode. Due to dynamic working condition of mobile sensors and the high data rate, back end analytic services confront incoming streams with large rate fluctuation and out-of-order...
Crowdsourced testing is an emerging trend in software testing, especially for mobile testing due to Android fragment issues. Gaining the productive outputs of high quality always comes with the assumption that the workers are experienced. However, the crowd of testers are not usually professionals. Thus, it becomes an interesting topic to guide the crowd to obtain domain knowledge and fulfill tasks...
This paper provides a substation live working robot system, which consists of mobile insulation lift platform, six degree of freedom hydraulic manipulator, master control system and live working tools. It can assist or replace the manual to complete some special live-working, such as insulator cleaning, RTV spraying, Insulator detection, Nitrogen flushing. The successful application of the robot provides...
new device for hot-line sweeping of post insulators in substations is introduced. The installation is composed of a sweeping actuator, an insulated transmission mechanism, a steering mechanism, a hydraulic driving device, anti dropping device, hydraulic mechanical arm, telescopic arm and a moving chassis insulation‥ And can complete the sweeping work of insulator under the condition of hot-line.
Smart video surveillance systems are essentials in modern environments to ensure safety and security for lives and property. In order to capture critical clues of reconnaissance, it is important to automatically and dynamically control the surveillance sensitivity and quality for detecting abnormal/suspicious events to perform high quality monitoring. In this work, we design a smart video surveillance...
Small cell enhancement has been considered as a promising way to cope with the rapid growth of need in mobile data traffic. However, it also leads to severe inter-cell interference, which means that some interference mitigation scheme is indispensable. Among lots of interference mitigation scheme, small cell on/off adaptation is thought to be an effective one. In this paper, small cells are modeled...
With the rise of sensor technology, ubiquitous mobile devices generate high-rate spatio-temporal data streams and send to backend servers in real time. While the mobile data streams are critical sources of mobility analytics supporting advanced mobile services, they also raise new challenges of scalable data processing for trajectory-featured data streams. In this paper, we develop a scalable framework...
Cooperative diversity is an effective transmission technique allowing multiple users to create a virtual antenna array although each of them is equipped with single antenna. In this paper, an iterative channel estimation and equalization (ICEE) scheme for single-carrier transmissions is proposed, realizing space-time block code (STBC) with amplify-and-forward (AF) relaying in a distributed fashion...
An intelligent home appliance control system, composed of intelligent socket and concentrator is proposed and investigated in this paper. The real time control of the appliance is realized through the intelligent socket by electrical power metering, alarm signal detection and control of the state of electrical switches. A concentrator is employed to achieve the control of appliances and real-time...
This paper presents an SD-based mobile gateway to wireless sensor network (WSN), named uSD, which aims at helping users with mobile terminals to access WSN conveniently and efficiently. The prefix "u" of uSD illustrates its most significant characteristic: universality, which means uSD is platform independent and compatible with heterogeneous platforms, truly plug-and-play. In this paper,...
Channel coding theories are widely used in computer science and communication systems. This paper proposes a novel channel coding scheme called accumulate repeat tree (ART) codes for improving the channel coding performance in mobile communication systems. This class of codes can be viewed as turbo-like codes combining many advantages of turbo codes and low-density parity-check (LDPC) codes. ART codes...
CDMA2000, WCDMA and WiMAX are three widely used 3G technologies. Since they share the same goal, which is to provide broader coverage and higher throughput in 3G networks, an impartial comparison of their performance is indispensable. However, they are based on different design principles and methodologies, which make the comparison challenging. This paper presents a comparative study of these technologies,...
OFDM has become one of the most important Beyond-3G transmission technologies. Mobile WiMAX is a typical representative of OFDM systems. The cross-layer optimization problem of inter-cell coordinated resource allocation for OFDM systems is addressed in this paper. We first analyze the problem by utility-based method, and formulate this optimization problem. Then the globally optimal and a sub-optimal...
Mobile WiMAX based on IEEE 802.16e standard can realize enhanced network capacity requirements and various services as well as provide more novel experiences for users. Since WiMAX joining in 3G camp as the new member, the coexisting research of WiMAX and other 3G system (WCDMA, cdma2000 1x and TD-SCDMA) deployed in the same service area has gained increasing importance. In this paper, the detailed...
Mobile WiMAX as an OFDMA (Orthogonal Frequency Division Multiple Access) mobile broadband air interface is a solution to the requirements for mobile internet services. It has been accepted by ITU as 3G standard last year. The work presented in this paper focuses on evaluation of the Mobile WiMAX system performance in which Full-Queue and VoIP traffic are considered both in downlink and uplink We have...
Mobile WiMAX has become one of the 3 Generation communication systems and its performance has been widely evaluated. The physical overhead is a critical factor that may affect the overall performance significantly. But almost no attention has been paid to the impact of overhead on system performance yet. In this paper, we first analyze main signaling resources needed in physical layer, which consist...
As an instrument to realize mobile communication in the blind zone, leaky coaxial cable (LCX) is recently widely used in communication systems of tunnels, mines, subways and so on. In this paper, beginning with the radiation theory of LCX and antenna, by the use of ray-tracing method, we take a tunnel for example to analyze its radiated field produced by both LCX and spiral antenna. By comparison,...
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