不确定多时滞奇异系统鲁棒H∞降维滤波器的设计

讨论了一类同时具有不确定性和多时滞的奇异系统鲁棒H∞降维滤波器的设计问题.目的是对于所容许的不确定性和多时滞,设计一个比原系统维数低的确定维数的稳定线性滤波器,使得滤波误差动态系统是渐进稳定并满足给定的H∞性能要求.该问题有解的充分条件是0≤ETY,rankX≤,Π1<0,Π2<0;并且当这些条件满足时,以参数显式化的形式给出了所求的鲁棒H∞降维滤波器.所有这些结果都只利用了原始系统的矩阵而没有分解,这就使得设计过程简便、直接.最后用数值算例验证了结论的可行性和有效性.     

Robust Continuous-time Generalized Predictive Control for Large Time-delay System

A simple delay-predictive continuous-time generalized predictive controller with filter （F - SDCGPC） is proposed. By using modified predictive output signal and cost function, the delay compensator is incorporated in the control law with observer structure, and a filter is added for enhancing robustness. The design of filter does not affect the nominal set-point response, and it is more flexible than the design of observer polynomial. The analysis and simulation results show that the F - SDCGPC has better robustness than the observer structure without filter when large time-delay error is considered.     

A Novel Analysis Approach for Ring-resonator Performance as Optical Filter

A novel attempt has been made in this paper for a different approach for determination of ring resonator transmittance with the help of delay line signal processing techniques and Totally Coded Method （ TCM ）. A generalized approach for determination of transfer function in Z-domain of optical waveguide based ring resonator is introduced. Delay line signal processing technique is used to develop the signal flow graph of different ring resonator architectures, and a rule is implemented to determine its overall transmittance. The parameters describing the performance of optical filter can be directly estimated from the frequency response plot. A waveguide based double ring resonator（DRR） architecture is proposed, and its frequency response analysis is carried out.     

基于综合滤波算法的心音信号去噪

针对小波分解重构滤波算法及形态滤波算法的缺点,提出将这两种数字滤波方法结合起来,利用形态滤波器滤除低频干扰信号,然后再由小波分解重构滤波器滤除高频干扰的算法,采用均方根误差比较三种算法,结果显示综合滤波去噪效果较好。     

基于开关函数的大功率混合型有源滤波器的建模研究

针对大功率混合型有源滤波器中应用了电压型逆变器结构,采用拓扑建模法过于繁琐,而输出建模又不易分析HHAPF内部的参数对装置特性的影响,本文通过引入开关函数,建立HHAPF的暂态数学模型的统一表达式,仿真结果表明该方法的可行性和有效性.     

一种组合导航的自适应信息融合算法

以GPS/INS组合导航系统为应用背景,针对组合导航系统信息融合的精度与稳定性要求,将简化的Sage-Husa自适应滤波算法与指数加权衰减记忆滤波算法相结合,提出了一种改进的自适应信息融合算法.仿真表明,改进的自适应算法解决了噪声统计特性和模型参数不易确定的问题,能够有效的保证信息融合的精度和稳定性.在算法仿真的基础上,对在VC 6.0环境下算法进行了改进,给出了GPS/INS组合导航系统的结构及软件框架,通过实验验证了改进的自适应算法的实际应用价值.     

基于形态学滤波和Hough变换的掌纹主线提取方法

提出一种结合形态学滤波和Hough变换提取掌纹主线的方法,在对方向性掌纹线特征子图像做形态学滤波后,将滤波图像转换至Hough变换参数空间,利用Hough变换具有的点线对偶性,检测参数空间内累加数组的峰值来确定主线的空间位置和走向,并展开邻域检测得到主线.本文算法更符合主线的自然生长规律,在成功提取主线的同时消除了粗大掌纹皱纹在主线提取中易产生的干扰.     

LDPC码在MIMO-OFDM迭代接收系统中的性能研究

MIMO-OFDM技术是未来宽带无线通信的关键技术之一,针对未来宽带无线通信高传输速率的要求,设计了一种基于二进制和多进制LDPC码的MIMO-OFDM迭代接收系统.并且为了降低系统复杂度,只在第1次迭代时使用MMSE滤波器,在第2次及以后迭代中均使用匹配滤波器.仿真结果表明:基于二进制LDPC码的MIMO-OFDM迭代接收系统相比基于四进制LDPC码的系统收敛更快,且两者的性能均远优于基于卷积码的系统性能.     

一种求解带不等式约束优化问题的新滤子SQP算法

介绍了一种线搜索滤子SQP算法,在适当的条件下证明了它的全局收敛性。该算法无需使用罚函数作为价值函数,也不需要可行性恢复阶段,对滤子接受条件有所改进,使其更容易接受好的迭代步,数值结果表明它是非常的。     

Small-Space Microphone Array Fractional Delay Algorithm Based on FIR Filter for Cochlear Implant

Directional speech enhancement of signals from microphone arrays is an effective way to improve speech recognition for cochlear implant users.The strict implant size limitation results in a short distance between microphones.The fractional delay problem due to the short distance between microphones is solved by a maximal flat (Maxflat) finite impulse response (FIR) filter,using the Maxflat error criteria at a low frequency containing most of the speech information and energy.The fractional Maxflat FIR filter approximates the ideal digital fractional filter at the magnitude response,phase response,and phase delay characteristics,and is also very low order.The results demonstrate that the Maxflat FIR filter accurately and effectively solves the fractional digital delay and is very suitable for real-time speech processing in practical cochlear implant products.