SIMO系统辅助变量最小二乘盲辨识方法

辅助变量辨识方法是一类重要的辨识方法,然而对于盲辨识,系统输入未知,辅助矩阵的选择就成了难题。针对盲辨识领域研究最多的单输入多输出(SIMO)系统,利用辅助变量方法研究相应的盲辨识方法,其基本思想是联立其中两个子系统进行辨识,利用其他子系统的输出来构造辅助矩阵,从而提出了辅助变量最小二乘盲辨识方法,来获得系统参数估计。还给出所提算法的递推形式,并进行了收敛性分析。仿真例子验证了所提方法的有效性。     

Improved chirp scaling algorithm for parallel-track bistatic SAR

The curvature factor of the parallel-track bistatic SAR is range dependent, even without variation of the effective velocity. Accounting for this new characteristic, a parallel-track chirp scaling algorithm (CSA) is derived, by introducing the method of removal of range walk (RRW) in the time domain. Using the RRW before the CSA, this method can reduce the varying range of the curvature factor, without increasing the computation load obviously. The azimuth dependence of the azimuth-FM rate, resulting from the RRW, is compensated by the nonlinear chirp scaling factor. Therefore, the algorithm is extended into stripmap imaging. The realization of the method is presented and is verified by the simulation results.     

一类基于投入约束的资源配置DEA博弈模型

结合数据包络分析(DEA)与Nash讨价还价博弈模型研究有限资源的合理配置问题。首先证明,在投入约束条件下,基于传统DEA模型的资源配置方法将陷入困境。为此,需要考虑各决策单元(DMU)对于有限资源的竞合关系,引入Nash讨价还价博弈模型,并证明最优资源配置方案具有唯一性。最终通过算例说明了本方法的合理性与可行性,与其它DEA分摊方法相比还具有一定优势。     

适应性存储和快速提取的记忆结构模式分析

考察联想记忆具有的可快速稳健处理信息的复杂适应性网络结构模式.以英国爱丁堡和美国佛罗里达词汇联想辞典为基础,分别构建词汇联想网络进行复杂网络分析.两大词汇联想网络既有短连接路径性、高云集性以及中心度幂律分布的共同特征,又存在联想关系的差异.虽然联想记忆的内容受到社会文化背景等因素的影响,但其基本结构组织模式符合利于快速信息提取的小世界结构和利于适应性信息存储的无标度特征.     

Testing serial correlation in semiparametric varying coefficient partially linear errors-in-variables model

The authors propose a V _{N, p} test statistic for testing finite-order serial correlation in a semiparametric varying coefficient partially linear errors-in-variables model. The test statistic is shown to have asymptotic normal distribution under the null hypothesis of no serial correlation. Some Monte Carlo experiments are conducted to examine the finite sample performance of the proposed V _{N, p} test statistic. Simulation results confirm that the proposed test performs satisfactorily in estimated size and power. This research is supported by the National Natural Science Foundation of China under Grant Nos. 10871217 and 40574003; the Science and Technology Project of Chongqing Education Committee under Grant No. KJ080609; the Doctor's Start-up Research Fund under Grant No. 08-52204; and the Youth Science Research Fund of Chongqing Technology and Business University under Grant No. 0852008.     

On the complexity of the normal bases via prime Gauss period over finite fields

A formula on the complexity of the normal bases generated by prime Gauss period over finite fields is presented in terms of cyclotomic numbers. Then, the authors determine explicitly the complexity of such normal bases and their dual bases in several cases where the related cyclotomic numbers have been calculated. Particularly, the authors ˉnd several series of such normal bases with low complexity. This research is supported by the National Fundamental Science Research Program 973 of China under Grant No. 2004 CB3180000 and the State Key Lab. (Information Security) of China.     

一种弱相关非高斯信道下的伪码捕获方法

针对弱相关非高斯噪声环境提出了一种伪码捕获方法,将伪码捕获等价为假设检验问题,将弱相关非高斯噪声建模为一阶滑动平均SαS噪声模型,利用局部最佳检测算法推导出弱相关非高斯噪声环境下的伪码捕获检测统计量,得到弱相关噪声模型下伪码二维捕获结构及其简化形式,进行了性能仿真并与传统的伪码捕获方法对比。仿真结果表明该捕获方法在相关非高斯噪声环境下检测性能有较大幅度的提高。     

Capacity analysis of high-rank line-of-sight MIMO channels

Matrix perturbation theory is utilized to investigate high-rank line of sight multiple input multiple output channels in a microwave relay system. The upper and lower bounds of channel capacity are derived based on space time block codes technique and singular values decomposition. A useful constraint for designing LOS MIMO channels is developed by the use of the condition number of the MIMO channel matrix. The theoretical analysis of channel capacity is confirmed by the simulation. The results show that the proposed method is able to give a physical explanation of the high-rank LOS MIMO channel matrix characteristics.     

Analysis of electrical performances of planar active phased array antennas with distorted array plane

The influence of the distorted plane of the active phased array antenna on the electromagnetic performance is of great significance to the research on and development of the high-performance antennas. On the bent and bowl-shape distortion, the model is established of the relationship between the electromagnetic performance and the position error of the radiated elements. The method is presented of analyzing the far-field pattern of the distorted rectangular active phased array antenna. The analysis results of a planar phased array antenna with different distortions grades prove the validity of the model. Therefore, by the method, the antenna designers may set the reasonable requirement on the structural tolerance in manufacturing antenna.     

考虑随机需求和库存决策的多商品物流网络设计的优化模型与算法

提出一种将库存控制决策和设施选址模型相结合的优化方法,用来解决一类多商品物流网络优化设计问题, 网络内的用户需求是随机的且服从正态分布,优化设计的目的是在满足一定服务水平的前提下,最小化物流网络内包括建设费用、储存费用 和运输费用在内的总成本费用,建立了一个能同时描述设施选址决策和库存决策的多商品物流网络设计问题的非线性混合整数优化模型,并使用组合模拟退火算法对其进行求解分析,最后的算例计算结果验证了模型和算法的有效性.