Science in China Series F: Information Sciences

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The effects of redundant control inputs in optimal control
Science in China Series F: Information Sciences - Tập 52 - Trang 1973-1981 - 2009
ZhiSheng Duan, Lin Huang, Ying Yang
For a stabilizable system, the extension of the control inputs has no use for stabilizability, but it is important for optimal control. In this paper, a necessary and sufficient condition is presented to strictly decrease the quadratic optimal performance index after control input extensions. A similar result is also provided for H 2 optimal control problem. These results s...... hiện toàn bộ
Joint frequency, 2-D AOA and polarization estimation in broad-band
Science in China Series F: Information Sciences - Tập 44 - Trang 161-167 - 2001
Jianying Wang, Jiyang Wang, Tiangi Chen
Based on nonuniformly spaced L-shape array, a novel algorithm using ESPRIT and integer search is proposed to estimate the frequency, two-dimensional angles of arrival (2-D AOA) and polarizations of incoming multiple independent spatial narrow-band signals. The L-shape array is composed of crossed dipoles that are paralleled to the coordinate axis. Computer simulation confirms its availability.
A low-complexity multiple signal representation scheme in downlink OFDM-CDMA
Science in China Series F: Information Sciences - Tập 52 - Trang 2433-2444 - 2009
LiLin Dan, Yue Xiao, Peng Cheng, Gang Wu, ShaoQian Li
OFDM-CDMA is an attractive technique for broadband wireless communication. However, the high peak-to-average power ratio (PAPR) of the downlink signals, generated from multiple spread codes, remains a serious problem. In this paper, a low-complexity multiple signal representation (MSR) scheme is proposed to control the PAPR problem in downlink OFDM-CDMA systems. The proposed scheme generates multi...... hiện toàn bộ
Efficiency-aware and fairness-aware joint-layer optimization for downlink data scheduling in OFDM
Science in China Series F: Information Sciences - Tập 51 Số 2 - Trang 171-182 - 2008
Kun Guo, Laixi Sun, Ping Wang, Jia Shilou
Doppler distributed clutter model of airborne radar and its parameters estimation
Science in China Series F: Information Sciences - Tập 47 - Trang 577-586 - 2004
Jia Xu, Yingning Peng, Qun Wan, Xiutan Wang, Xianggen Xia
To characterize the clutter spectrum center-shift and spread of airborne radar caused by the platform motion, a novel Doppler Distributed Clutter (DDC) model is proposed to describe the clutter covariance matrix in temporal domain. Based on this parametric model, maximum likelihood, subspace based method and other super-resolution methods are introduced into the Doppler parameters estimation, and ...... hiện toàn bộ
An improved description method of the bumpy texture
Science in China Series F: Information Sciences - Tập 52 - Trang 523-528 - 2009
RongHua Gao, DeHui Kong, BaoCai Yin
Bump mapping is a texture-based rendering approach for simulating surface details to make its illumination results have three-dimensional effects. The bumpy properties of an object are determined by height maps. But in the process of generating height maps, a problem arises, i.e. to get a correct value of the pixel height, empirical data should be calculated repeatedly, which proves very complicat...... hiện toàn bộ
Response compaction for system-on-a-chip based on advanced convolutional codes
Science in China Series F: Information Sciences - Tập 49 Số 2 - Trang 262-272 - 2006
Yu Han, Huawei Li, Xiaowei Li, Anshuman Chandra
Structure-independent disaster recovery: Concept, architecture and implementations
Science in China Series F: Information Sciences - Tập 52 - Trang 813-823 - 2009
WeiMin Zheng, BinXing Fang
Disaster recovery (DR) techniques ensure the data safety and service continuity under different natural and human-made disasters by constructing a high reliable storage system. Traditional disaster recovery methods are structure-dependent. It is hard to share the DR resources between different DR systems, which made it expensive. We present a structure-independent disaster recovery theory and its ...... hiện toàn bộ
Dynamic scheduling model of computing resource based on MAS cooperation mechanism
Science in China Series F: Information Sciences - Tập 52 - Trang 1302-1320 - 2009
WeiJin Jiang, LianMei Zhang, Pu Wang
Allocation of grid resources aims at improving resource utility and grid application performance. Currently, the algorithms proposed for this purpose do not fit well the autonomic, dynamic, distributive and heterogeneous features of the grid environment. According to MAS (multi-agent system) cooperation mechanism and market bidding game rules, a model of allocating allocation of grid resources bas...... hiện toàn bộ
Ternary optical computer principle
Science in China Series F: Information Sciences - Tập 46 - Trang 145-150 - 2003
Yi Jin, Huacan He, Yangtian Lü
The fundamental principle and the characteristics of ternary optical computer, using horizontal polarized light, vertical polarized light and no-intensity to express information, are propounded in this paper. The practicability to make key parts of the ternary optical computer from modern micro or integrated optical devices, opto-electronic and electro-photonic elements is discussed. The principle...... hiện toàn bộ
Tổng số: 523   
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