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An all-digital quadrature RF transmitter implemented in TSMC 65-nm CMOS technology is presented. The transmitter incorporates an 8-bit low-pass ΣΔ modulator to reduce the digital baseband data width and the complexity of multi-bit power amplifier cells while not significantly deteriorate the in-band signal quality. For an 802.11g 20MHz OFDM signal, the transmitter achieves 13.93dBm average output...
High Q-factor photonic crystal cavities are designed on transparent PVK polymers with relatively low refractive index. The inplane and total Q-factor of the devices are analyzed. Experimental implementation is discussed.
Wi-Fi and smartphone based positioning technologies are playing a more and more important role for tracking and positioning due to the rapid development of the smartphone market. However, the low positioning accuracy of these technologies is still an issue for indoor positioning. This research is part of an Australian Research Council (ARC) project required by a large global shopping mall company...
In this paper, an alternative jointly optimized transceiver scheme is proposed to reduce the multi-user interference in the distributed antenna system (DAS). First a joint design for the pre-coders and combiners is proposed based on the signal-to-leakage-plus-noise ratio (SLNR) maximization and the receive signal-to-interference-plus-noise ratio (SINR) maximization, respectively. Then a modified weighted...
Noncontact laser ultrasonic methods are provided for nondestructive characterization of surface residual stress and thermally growth oxide (TGO) in thermal barrier coating (TBC). Stress-acoustic coefficients of Rayleigh wave were used to characterize the surface residual stresses of TBC specimens which were prepared by electronic beam physical vapor deposition (EB-PVD) method. The ultrasonic testing...
The design of a modified unidirectional radiation miniaturized compound spiral antenna fed by an exponentially tapered balun is shown in this paper. The compound spiral antenna is designed by combining a typical equiangular spiral antenna with Archimedean spiral line. By taking advantage of a modified reflector to make the antenna into a microstrip form, the structure realizes a typical unidirectional...
In this paper, solid phase epitaxy (SPE) process is proposed to improve phosphorous activation and hence reduce the contact resistivity of n+/p junction for Ge n-MOS technology. Over 1×1020 cm−3 electrical concentration and about 1.75×10−6 ohm·cm2 contact resistivity have been achieved at P+ implantation of 10keV and 5×1014cm−2 and annealing condition of 600oC, 10seconds. The fabricated N+/P diode...
With the accumulation of maintenance data from the operation of vehicle on-board equipment (VOBE), it plays an important role in fault diagnosis and prognosis. However, natural language in maintenance data is a big challenge for fault diagnosis due to its irregular feature and uncertainty semantics. Some researchers have introduced text mining methods to deal with this problem, but they lose sight...
Wind turbine converters may be damaged by lightning-induced surges. This paper provided an experimental study on the surge protection of converters in direct-driven permanent-magnetic wind turbines. Firstly, this paper describes the design of the experimental study and presents the obtained experimental results. Then, a discussion is presented about different earthing methods of the converter in the...
Part-based approaches, such as Deformable Part Model (DPM), have been actively studied for pedestrian detection in recent years. However, the overall pedestrian detection performance heavily depends on the detection accuracy of a single part detector, which is not so discriminative that usually easily affected by occlusions and deformations. To address this problem, in this paper, we propose a novel...
Carrier Interferometry Orthogonal Frequency Division Multiplexing (CI/OFDM) can mitigate the problem of high peak-to-average power ratio (PAPR) of OFDM signal. In practice, some subcarriers have to be deactivated in order to avoid harmful interference to licensed system in cognitive radio (CR) context. For these cases, Non-Continuous CI/OFDM (NC-CI/OFDM) has recently been proposed, for which some...
In software reliability testing based on Markov chain usage model, how to assign the migrating probability between states of the Markov chain usage model is still a problem yet to be solved. In order to deal with the problems such as the sample data for estimating the migrating probability being small and uncertain, a migrating probability assignment method based on a three-parameter interval number...
Circulating cooling water occupies a high proportion in industrial production. The corrosion and scaling are common quality faults in the circulating cooling water system, which affect the operation of industrial equipment seriously. Through the analysis of the high concentrated multiple water quality data, choose the water quality parameters which have a greater impact on the corrosion rate and adhesion...
The separation process of missile hood is influenced by many kinds of uncertain factors, along with limited trial number of target range and interplay between influencing factors, thus it is difficult to precisely determine separation process and hood landing locations. The aim of this study is to establish dynamic simulation model of hood separation and landing track based on Monte-Carlo method....
With the rapid growth of global mobile data transmission, the conventional multiple-input multiple-output (MIMO) systems are not able to accommodate the increasing data demand. The massive MIMO has been proposed as one of the key technologies for the next generation wireless communication systems. Compared to the conventional MIMO systems, massive MIMO systems are advantaged in energy and spectral...
In this paper, coordinated beamforming scheme in distributed antenna systems (DASs) used for energy efficient transmission is developed. The major problem is non-convex of the optimization problem and is difficult to solve directly due to the fractional form. It is transformed into an equivalent subtractive-form optimization problem, by which we tackle this problem through a two-layer optimization...
Social Network Service (SNS) has been explosively growing and generating huge amounts of data every day, it is a meaningful job to mine useful information from the big data which generated from the social networks. In this paper, we study the relationship and behavior of social network users, and then put forward a model which combines Clustering Algorithm with Factorization Machine (FM) for SNS Friend...
Feature learning plays a crucial role in the successful human action recognition. There has been a number of approaches extracting action features from depth information and 3D skeletal data. However, either the skeleton information or the depth map is not accurate for feature learning unless complex descriptors are carefully designed and embedded. In this paper, we first propose a data sparsification...
In the massive Multiple-Input Multiple-Output (MIMO) system, a large number of transmit antennas are deployed at base stations. The massive MIMO has been proposed as one of the key technologies for the next generation of wireless communication systems. A major problem in practice to realize the capacity improvement promised by the massive MIMO technology is the availability of the channel state information...
In the changing electricity power supply chain, demand response from buildings is a crucial control resource. Whereas numerous studies exist on peak load reduction activities using buildings, few represent building side perspectives. The result is oversimplification of analyses and a near silence on building side considerations. This study uses the building centred productiveness concept to analyse...
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