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This paper presents a 6-bit active phase shifter in 0.13-μm SiGe BiCMOS technology for Ku-band phased arrays based on a phase interpolation technique. An input Marchand balun and a RC poly phase filter are used for high I/Q accuracy wideband quadrature generation with high linearity and an integrated current-mode DAC is used for controlling the amplitude of I/Q path signal to achieve 6-bit phase resolution...
With the development of long life and high reliability satellite, the radiation resistance ability of aerospace components has been put forward higher requirements. If the radiation resistance ability of components doesn't satisfy the requirement, it will need to be hardened by radiation shielding. However, there is a great deal of redundancy in the radiation shield hardening method used in satellite...
The Single Event Upsets on deep submicron and nano devices are analyzed. The Single Event Upsets on 0.18μm Static Random Access Memory in space orbits are measured. The measurement results show that the Single Event Upset (SEU) rates of 0.18μm Static Random Access Memory (SRAM) in Low earth orbit (LEO) are about one order of magnitude higher than geosynchronous orbit (GEO). The proton and heavy ion...
Because of properties of high speed, high breakdown voltage, low leakage current and high temperature resistance, silicon carbide (SiC) power devices can be used as processing units in advanced space high-power power system and high temperature propulsion power. However, the single event gate-rupture and burn-out on silicon carbide (SiC) power devices is main problem in space application for its high...
Graph algorithms currently play increasingly important roles, especially in social networks and language modeling scenarios. Recently, accelerating graph algorithms by heterogeneous high performance computers with the integrated cores and expanded SIMD lanes has been becoming the mainstream. However, the existing methods, restricted by the low-efficiency grouping strategy and the non-optimized selection...
A 10-bit 2GS/s time-interleaved SAR ADC with low-complexity background timing skew calibration is presented. 10% of the area is utilized for the interleaving mismatch estimation and correction. The ADC achieves −64dB mismatch spur and 50.1dB SNDR at Nyquist rate, with 10.4mW power consumption and 0.014mm2 area in 16nm.
Omnidirectional stereovision has wide applications in object detection, three-dimensional reconstruction and robot navigation thanks to its large field-of-view. In this paper, a novel configuration that consists of one single camera and multiple mirrors is proposed. The significant improvement is to design a principal mirror above the four sub mirrors placed in a plane to achieve four pairs of stereovision...
Sound source location based on General Cross-correlation can be divided into two parts—time delay estimation and location estimation. Considering the cost and calculation speed, the location system based on GCC receives more and more concern from researchers. This paper provides a new approach to improve the accuracy of location estimation using signals from two microphones. For that reverberation...
The feedback Active Noise Control (ANC) is mainly used to reduce tonal noise, but for broadband noise like chaotic noise, it is less involved other than using filtered-s least mean square (FSLMS) algorithm. Though the feedback ANC based on FSLMS algorithm is successfully used to reduce chaotic noise, there are still some drawbacks such as slower convergence speed, larger steady-state error and heavier...
Face recognition with partial occlusion is one of the urgent and challenging problems in the pattern recognition research. Using the Alternating Direction Method of Multipliers (ADMM), the recently proposed nuclear norm based matrix regression model (NMR) has been shown a great potential in dealing with the structural noise. And yet, ADMM needs to bring into an auxiliary variable and only exploits...
By analyzing the theory of functional link artificial neural network (FLANN) structure based on filtered-s least mean square (FSLMS) algorithm which is usually used in the nonlinear active noise control (NANC) system, it can be found that the controller coefficients of nonlinear parts are multiple related, this problem causes much unbalance to calculate these coefficients and restraints the performance...
To ensure the quality of products and efficiency of machining and to protect the machine tools from damage in high speed working conditions, one of the key solutions is to smooth the feedrate profile at the corner of two adjoining moves. In the paper, a vector based look-ahead algorithm is presented for feedrate smoothing at trajectory corner by interpolating adjoining moves simultaneously. By analyzing...
A wideband 2–3 GHz three-stage low noise amplifier (LNA) featuring current reuse, cascaded L-match input network, and multiple gated transistors method (MGTR) is designed in 0.18-μm CMOS technology. The current-reused topology is adopted to fulfill low power consumption, meanwhile, high gain and low noise are obtained. The cascaded L-match input network is used to enhance the input matching bandwidth...
This paper presents a novel tuning method for complementary filter exploited for attitude estimation. The complementary filter is the choice of the day in fields where computational simplicity, low power consumption and low cost involved are of prime significance with little interest in the highest degree of accuracy. It is well-known that attitude estimation based on gyroscope measurement alone quickly...
Photovoltaic (PV) array modeling is the prerequisite of related researches. It becomes difficult when partial shading conditions and different PV array configurations are taken into consideration. In this paper, PV array characteristics under partially shaded condition are expressed as a set of nonlinear equations applying Kirchhoff's law. Then we solve the nonlinear equations with the help of a modified...
Deploying cache has been generally adopted by Internet service providers (ISPs) to mitigate P2P traffic in recent years. Most traditional caching algorithms are designed for locality-unaware P2P networks, which mainly consider the requested frequency of contents as the principle of caching policies. However, in more prevalent locality-aware conditions with biased neighbor-selection policies, the existing...
For mobile terminals, the resources availability always changes continuously because of the mobility and services providing. Based on a resource-aware architecture, the paper proposes an adaptive algorithm using PID and fuzzy control model to adjust the QoS of terminals according to the resources availability. In such architecture, resources can be allocated in stable and agile way. Applications can...
The rapid rising of Linux users requires P2P, an efficient content transport method, to distribute packages. Different from traditional streaming P2P systems, a P2P package distribution system is hazarded by the special characteristics of small package size and hot packages. Due to the small package size, DHT search performance, which is rarely considered in traditional P2P system, comes to be an...
Recently, nuclear norm based matrix regression (NMR) for classification has been proposed to characterize the whole structure of the error image. However, NMR ignores both the label information and the group structure of training samples. This paper presents a novel yet effective coding scheme called locality-constrained group sparse coding regularized NMR (LGNMR) which not only overcomes these limitations...
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