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This paper presents the studies for the end-to-end QoS of IP over integrated terrestrial and Next Generation Satellite Network (NGSN) using HTTP web application. We compare between Big-LEO and EuroSkyWay like satellites constellations for the QoS parameters (e.g. delay, loss ratio, throughput and connection duration) of request-response HTTP connections from a remote server in London and a remote...
Service-based systems (SBSs) are distributed systems which have many advantages, including rapid composition of services for distributed applications. In these systems, various capabilities are provided by service providers as services interconnected by networks. It is important for users of SBSs to have confidence in the trustworthiness of service providers. Existing approaches to trust estimation...
In this paper, we propose a distributed access point selection scheme by which nodes select an appropriate access point to associate with based on each individual device's channel utilization. We define channel utilization as the ratio of required bandwidth to estimated available bandwidth. By incorporating channel utilization into the access point association protocol, we can effectively reduce unnecessary...
The use of process-bus technology, designed in accordance with the IEC 61850 standard, introduces new opportunities for protection and control. However, before the technology can be deployed, adequate tests are required to prove use of the process bus does not have a detrimental impact on the operating performance of future protection, as expressed in terms of dependability, security and operating...
The formation of the transient capacitive current and its effects on the HVDC transmission line differential protection is analyzed based on the wave propagation principle in this paper. The magnitude of capacitive current in the transient process of DC line fault is directly proportional to the time difference of fault signal travelling to both terminals of the line. Based on that, a novel HVDC differential...
Vehicle ad hoc network (VANET) featured by distribution, no center and flexibility, largely expands the function of vehicle parts and greatly improves the safety and efficiency of transportation as well. VANET broadcast protocol is the main method to transmit dada. In this paper we analyzed the characteristics and disadvantages of existing broadcast protocols and proposed an improved algorithm named...
Achieving the required Quality of Service (QoS) is an important requirement in a communication network. In recent years, VSAT technology has become one of the popular means to interconnect with people around the world. However, VSAT satellite network has high latency constraint and provides low and limited bandwidth. These limitations caused network congestion when the bandwidth-intensive real-time...
After the acquisition stage of a GNSS receiver has roughly synchronized the received and the locally generated codes typically within less than a half chip period residual offset, a fine synchronization stage, named signal tracking, takes over and continuously maintains and corrects the best possible alignment between the two codes by means of closed loop operations. In this paper, we mainly consider...
In this paper, we propose a novel method to generate the cyclostationary signature for Orthogonal Frequency Division Multiplexing (OFDM) signals with a low overhead of signature (i.e. number of signature subcarriers) and a good performance of the signature detection under frequency-selective fading channel, for dynamic spectrum access (DSA) networks. Moreover, we also present how to employ the proposed...
Underwater acoustic (UWA) communication researches continue to focusing on higher spectrum-efficiency. This paper proposes a low complexity spatial parallel transmitting scheme based on layered space-time coding and spectrum spreading, named LST-SS scheme, to increase spectrum efficiency of UWA communication systems. In this scheme, layered signals are spread by the spreading code. Detection of signals...
In LEO satellite communication system, the high speed movement of satellite makes the AER (Azimuth, Elevation, Range) characters of inter-orbit adjacent satellite changing deeply. So, the topology optimization of LEO satellite becomes a big challenge to OBP (On-Board Processing) satellite system. In this paper, the Polar global coverage satellite constellation is studied. The inter-orbit and intra-orbit...
A space-time cooperative transmission scheme based on orthogonal space-time block codes (OSTBC) and single-carrier block transmission (SCBT) is proposed. The scheme can be applied to asynchronous cooperative transmission scenarios with any number of relay nodes. By simple linear combination and minimum-mean-square-error frequency-domain equalization (MMSE-FDE), the scheme can obtain full diversity...
The increasing scarcity of water resources, local drought is getting worse. Rational use and conservation of water become the subject of widespread concern. Because of detection of the amount of a single for the existing toilet facilities, which prone to malfunction. After that reason paper design a combination of weight and photoelectric detection of two kinds of signals. It is new flushing device...
The downhole directional steering system captures mechanical connections and interactions between different parts. Due to the spatial delays, parametric uncertainties and modeling inaccuracies in the system, the closed-loop stability and robust performance are challenging problems to address. Towards this goal, the current paper presents an ℒ1 adaptive controller which drives the output of the system,...
As the complexity of the influence factors of the equipment using process and the problems of the existing models, we delaminate the process and describe each of them with models, then we advance the all-purpose Task-Model and bring forward the task logical flow. We analyze the characteristics of the High Level Architecture (HLA) and advance the frame of the equipment using process simulation system.
In this paper, a generalized likelihood ratio test (GLRT) is adopted to realize optimum detection for differential UWB signal. Supposeing the channel circumstance is unknown, receiver presented in this paper is structured as follows. First of all, the maximum likelihood (ML) estimation of channel is completed. And then statistic detection of differential UWB signal is practiced. The receiver is approved...
Very Long Baseline Interferometry (VLBI) has been developed in China near 30 years for astronomical studies. Since 2003, following the development of Chinese lunar and deep space exploration, the astronomical VLBI technique was adapted for tracking and orbiting the Chinese Chang'E 1 & 2 missions, and played important role on positioning the orbit injection and hard landing. Since 2007, the concepts...
Wireless power transfer technique can be used in many applications nowadays. The main limitation of this wireless power transfer system is in their interface circuitry. In this paper, a highly efficient active rectifier is proposed. By adopting the high speed comparator and, proposed rectifier solved the turn on and off delay of power transistor problem of conventional rectifier and shows high power...
this paper addresses with the resequencing queue size on multi-path transfers in the view of queuing system. We use resequencing queue size of bottleneck packets as criteria to measure the resequencing buffer occupancy, by giving out its concrete formula, the influence of traffic intensity, paths difference and paths number on resequencing queue size of bottleneck packets is analyzed. Results show...
The correlation network of neurons emerges as an important mathematical framework for a spectrum of applications including neural modeling, brain disease prediction and brain-machine interface. However, construction of correlation network is computationally expensive, especially when the number of neurons is large and this prohibits realtime applications. This paper proposes a hardware architecture...
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