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In a mobile campus, the information and services related to location are really needed. Because satellite positioning systems can't afford locational requirement in bad outdoor scenario and indoor situation, the method of cooperative positioning provided another way to solve this problem. Aimed at the problem in which the unknown nodes in outdoor get a poor localizability for linking less sufficient...
Quick response to fault occurrence of rotating machinery relies mainly on an accurate detection for the change of frequency constitution in vibration signals. As modern rotating machinery becomes more complex with an increasingly extreme working condition, the feature characterization of nonlinear and nonstationary data can be easily smeared by traditional time-frequency (TF) analysis tools. The Hilbert-Huang...
Packet loss degrades the performance of multicast in various cloud services and reliability still plays a critical role in group communication within data center network (DCN). However, existing reliable multicast algorithms either cannot satisfy the stringent requirement of minimizing repair delay or do not utilize network bandwidth effectively. In this paper, we present MTM, a novel reliable multicast...
In this paper, a numerical model of halloysite nano-tubes (HNTs) modified surface plasmon resonance sensor is established and optimized. The simulations investigate the effect of HNTs size parameters on the SPR sensor performance. From this study we can find that the optimal design for halloysite modified SPR sensor.
Baseline estimation is a necessary step in processing of InSAR. The theory of block adjustment is introduced in baseline estimation to reduce the needed number of ground control points (GCPs). The main disadvantage of the method is that it has to extract substantial tie points (TPs) in the overlapping areas. If all TP heights are seen as unknown parameters, the coefficient matrix in normal equation...
Fresnel mirror can greatly improve the compactness of imaging system, which has many advantages such as light, thin, and easy to integrate. Due to the limitations of the shape precision and the surface roughness by available fabrication technology, most Fresnel mirrors can only be used for illuminating and focusing areas. This paper presents a Fresnel mirrors ultra precision forming method, which...
We present a method to fabricate diffractive optical elements (DOEs) with four phase levels by the Laser Direct Writing technology. One computation method is provided to optimize the step depth, which could improve efficiency of DOEs. The step depth and imaging results demonstrate the fabricated DOEs devices with good optical properties. The effective areas of the DOEs pattern are as large as 49 cm...
BOF (Basic Oxygen Furnace, BOF) steelmaking endpoint prediction is one of the most important steps in the blowing process. The flame recognition has proven as a useful method for endpoint prediction. But the previous methods are not suitable to extract the flame characteristic because of flame randomness and multi-scales problems. A multi-scale color difference histogram features weighted fusion method...
Combining the research situation of travelling crane anti-collision system, this paper presents a way of phase-shift laser ranging using sine amplitude modulation to solve the measurement precision deficiency of travelling crane anti-collision system. In order to enhance the precision of measuring result, system uses independent inner and external optical receiving circuit, eliminating the additional...
This paper presents a new modular design of a yokeless Linear Switch Reluctance Machine (LSRM), the stator of which is consisted of soft ferro-magnetic segments, and the mover includes separated cores wound by a simple annular winding. The mover cores have different width while the larger one are wound by the coils, leaving the smaller one unwound. A standard design procedure is developed. The results...
In this paper, the performance of universal-filtered multi-carrier (UFMC) system is analyzed. Specifically, the UFMC signals are generated with Dolph-Chebyshev, Hamming and Hanning filtering. The characteristics of UFMC signals are also compared with OFDM signal, in both software and hardware-in-the-loop simulations. Experimental results show that UFMC signals have better performance than OFDM signal,...
Femtocells are envisioned as a key solution to embrace the ever-increasing high data rate and thus are extensively deployed. Given that numerous femtocell access points (FAPs) deployed in ultra- dense networks (UDNs) lead to significant energy consumption, boosting their energy efficiency (EE) becomes an important issue to be addressed. However, most existing works either focus on homogeneous networks...
This paper presents the development of a technique which attempts to characterizes the ground plane characteristics via measurement. The mean effective gain, which assesses the general property of antenna reception capability in the environment, has been used for handset antennas such as GPS reception antennas. However, current models are established on a rough assumption about the ground properties...
Antenna diversity performance assessment measures are essential to multi-antenna systems. Among different evaluation metrics, the effective diversity gain is the ultimate ones since not only antenna characteristics but also environment factors are accounted. However, the conventional effective diversity gain measurement process is time consuming and labor intensive process. A semi-automatic measurement...
In this work, a capacitive coupling elements antenna is proposed for handset devices. A dual-band matching network is employed to provide matching in the two LTE bands, Primary advantages of this antenna configuration include small sizes, simple structure, low cost, good radiation efficiencies and easy antenna tuning. The mechanisms for achieving low and high band matching at the same time are explained...
The proliferation of data-hungry smart electronic devices, such as smartphones and intelligent vehicles, has driven the capacities of current mobile communication systems towards their limits. To tackle this formidable challenge, 3GPP Long Term Evolution has recognized network densification with low-power small cells (SCs) as a key paradigm in the upcoming 5G communication system. In this article,...
This paper addresses the adaptive coding problem for mobile satellite communication systems with the dual-polarized multi-input multi-output (MIMO) deployment. In general, the satellite communication systems have a long channel delay, and then traditional adaptation schemes suffer from performance degradation. To overcome this drawback, we propose to add statistical channel state information (CSI)...
Network densification with small cells has been recognized as the key mechanism in addressing the unremitting traffic growth over the next decade. This hierarchical network paradigm is characterized by highly fluctuating traffic demand, vast amount of signaling exchange, as well as progressively intensified resource under-utilization owing to service asymmetry. A flexible backhaul framework is imperative...
The large-scale multiple-input multiple-output (MIMO) system achieves high spectral efficiency, and its performance is ultimately limited by pilot contamination. Since the channel energy usually concentrates in a significant angle region, some mean-square-error (MSE)-based schedule methods have been proposed to mitigate the contamination, but these methods cannot guarantee the quality of service (QoS)...
This paper introduces a novel backhaul architecture for LTE small cells, where the macro eNB transports backhaul traffic wirelessly to a small cell through a new type of backhauling component, referred to as Type-A Relay. Equipped solely with UE modules, a Type-A relay is capable of communicating simultaneously with two eNBs by leveraging the downlink resource of one as well as the uplink resource...
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