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Ships stability and safety are always threatened by the unavoidable sway in the complicated situation of the sea, e.g. strong wind and roaring waves. Ensuring the stability of the ship as a difficult task has received its popularities in the community in the past few decades. However, conventional control methods such as sliding mode control (SMC) and Proportional integral derivative (PID) fail to...
Threshold-based caching has been widely researched in the literature of content-centric network. Most of the existing approaches only consider the user experience performance, i.e. the average request delay, in the cache networks. In this paper, we propose to consider the system cost metric of cache utilization ratio, and develop a kind of threshold-based caching algorithm that aims to reduce the...
The influence of the dielectric-background on UHF RFID tag is first investigated in this paper. Influence made by εr, length, width and thickness of tag antenna is respectively studied. Simulation results given in this paper are benefit to the future dielectric RFID tag design.
This paper analyzes a spectrum reuse scheme based on region division for secondary users in cognitive radio networks with outage constraint of the primary user. The secondary users can reuse the spectrum by sharing the primary user's uplink (UL) frequency resources in the system. With the help of the stochastic geometry, the secondary user reusing the frequency spectrum can be modeled as the probability...
This paper analyzes the transmission capacity of D2D (Device-to-Device) network in cellular and D2D heterogeneous networks(HetNets) with cellular users (CeUEs) assisted. The D2D network capacity can be enhanced by allocating a part of CeUE transmission power to assist D2D communication. By utilizing stochastic geometry, we first model the HetNets by homogeneous Poisson point process (HPPP). Secondly,...
This paper aims to design efficient and effective approaches to virtual network embedding (VNE) problem, which deals with the embedding of a requested virtual network (VN) in an underlying physical (substrate network) infrastructure. When the node and link constraints (including CPU, memory, network bandwidth, and network delay) are both taken into account, the VN embedding problem is NP-hard, even...
In order to solve recognition of modulation signals, which is an important issue in cognitive radio, the paper proposes a new algorithm of recognition of modulation signals. The paper firstly analyzes a new algorithm of cooperative sensing and simulates it in low SNR. Secondly, it proposes new expressions of transient characteristic parameters and shows the procedure of how to define the thresholds...
To drive hydraulic cylinder directly by hydraulic pump closed-loop represents a hot research area in the field of electro-hydraulic control technology today, and is the most direct means to improve the energy efficiency of electro-hydraulic control system. So far, this technology has been well applied to the pump-controlled symmetric hydraulic cylinder. But for the differential cylinder that widely...
Uncooled infrared detectors are applied widely in both civilian and military. Recently, novel microbolometers composing of two planes located at different levels were proposed to improve the performance of the detectors. In this paper, such two-layer microbolometers were simulated by finite element analysis. Results reveal that when SiO2 film is utilized as the isolating and supporting material located...
In this paper, we develop a simulation tool to study the performance of hybrid femtocell access in a High-Speed Downlink Packet Access (HSDPA) network. A hybrid resource allocation scheduler is developed in order to balance the tradeoff between open and closed femto access strategies. Performance in terms of macrocell traffic offloading is investigated under the dynamic configuration of a network...
Coordinated Multi-Point transmission and reception (CoMP) technique is a new promising scheme which has been adopted in LTE-Advanced. For the next generation of wireless communication networks, CoMP is mostly required to reduce the inter-cell interference (ICI). It also increases the cell edge user throughput and improves the coverage. Recently, most research work based on precoding with feedback...
The ever growing demand for wireless services has placed enormous burden on valuable resources such as spectral bandwidth. Cognitive Radio (CR) with dynamic access is becoming the main trend of the next generation wireless communication system as it can greatly increase the efficiency of spectrum utilization. OFDM, which can allocate spectrum resource conveniently, is the main modulation scheme of...
With the combination of T-S fuzzy model and conventional PID controller, as well as by means of the self-learning and self-organizing ability of neural network, an intelligent control algorithm based on T-S fuzzy neural network PID control is presented in this paper. With this control algorithm, an pressure controller for solenoid valve test was designed and the corresponding simulation was carried...
Coordinated Multi-Point transmission and reception (CoMP) technique has been adopted in LTE-Advanced as one of the promising techniques because it can significantly increase the throughput of the cell edge user and the total sector throughput for both downlink and uplink transmission. Compared with conventional cellular system, CoMP can reduce inter-cell interference (ICI) significantly. On the other...
Energy injection effect and mechanism of silicon bipolar low noise amplifier (LNA) through the injection of a special signal are experimentally studied in this paper. The experimental results show that the passive resistor is also one of the weaknesses of silicon LNAs in addition to the active device. Based on the low noise design rule of LNA, a wider passive resistor design is particularly useful...
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