线性广义时滞系统的无源控制

研究了线性广义时滞系统无源控制问题,利用广义lyapunov函数和线性矩阵不等式,给出了线性广义时滞系统无源且零解渐近稳定的充分条件,并且在一定条件下给线性广义时滞系统设计了一个状态反馈控制器,使得闭环系统无源且零解渐近稳定．     

A novel zero-payload downlink CSI feedback scheme for closed-loop beamforming system

A novel downlink channel state information(CSI)feedback scheme is proposed for the closed-loopbeamforming system.In the proposed scheme,mobile terminal(MT)superposes the uplink pilot on thereceived downlink pilot,forms the hybrid pilot(HP),and then transmits the HP to base station(BS)viathe uplink pilot channel.Because downlink CSI can be recovered from HP at BS side without consumingextra uplink bandwidth,the proposed scheme can achieve zero-payload CSI feedback,effectively solvingthe traditional bottl...     

Design of a 6.25 Gbps backplane SerDes with adaptive decision feedback equalization

A 6.25 Gbps SerDes core used in the high speed backplane communication receiver has been designedbased on the OIF-CEI-02.0 standard. To counteract the serious Inter-Symbol-Interference (ISI),the core employed a half-rate four-tap decision feedback equalizer (DFE). The equalizer used the Sign-signleast mean-squared (SS-LMS) algorithm to realize the coefficient adaptation. An automatic gain control(AGC) amplifier with the sign least mean-squared (S-LMS) algorithm has been used to compensatethe transmissio...     

二阶Emden-Fowler中立型时滞微分方程振动性

借助广义Riccati变换和不等式技巧,研究了二阶Emden-Fowler中立型时滞微分方程的振动性,给出了该类微分方程解区间振动的几个新准则.     

具连续变量的二阶超线性中立型差分方程的有界振动性

由于计算机科学、生物学、控制理论、医学及经济学等自然科学和边缘学科的进一步发展,提出了许多由差分方程描述的具体数学模型,因而对差分方程的研究在理论和实际应用二方面都具有重要意义。本文利用Banach压缩映射原理和一些分析技巧,研究了一类具有连续变量的不稳定型二阶超线性中立型时滞差分方程无界正解的存在性和有界解振动性问题,得出了该类方程无界正解的存在性定理及有界解振动的一个充分条件。     

不确定随机时滞系统的鲁棒H_∞滤波

针对具有凸多面体不确定性且扰动可抽象为一维布朗运动的随机时滞系统,利用李雅普诺夫稳定性理论推导出使随机不确定时滞系统渐近稳定且鲁棒L1/H∞滤波器存在的充分条件,将其表达成线性矩阵不等式(组)的形式,再利用Schur补引理对其进行转化,完成鲁棒H∞滤波器的设计,通过标准的数值软件进行求解.仿真结果验证了针对随机不确定时滞系统,所提出滤波器设计方法的有效性.     

考虑感染时延的局域世界复杂网络上疾病传播行为

将感染时延引入到经典的Susceptible-Infected-Susceptible(SIS)模型来研究局域世界复杂网络上带有时延的疾病传播行为.均匀时延和度相关时延被集成到改进的SIS模型中,通过数值仿真研究时延对传播行为的影响.结果表明感染时延会促进疾病的爆发,大大增加复杂网络上疾病感染程度.此外,局域世界大小M也会显著影响网络中的疾病传播行为.     

变分Lyapunov函数方法与脉冲时滞切换系统的稳定性

利用变分Lyapunov函数方法和Razumikhin技巧,建立了脉冲时滞切换系统的变分比较原理,得到了该系统一致渐近稳定的比较结果.     

Tracking controller for robot manipulators via composite nonlinear feedback law

A composite nonlinear feedback tracking controller for motion control of robot manipulators is de-scribed. The structure of the controller is composed of a composite nonlinear feedback law plus full robot nonlinear dynamics compensation. The stability is carried out in the presence of friction. The controller takes advantage of varying damping ratios induced by the composite nonlinear feedback control, so the transient performance of the closed-loop is remarkably improved. Simulation results demonstrate the feasibility of the proposed method.     

Adaptive broadband beamformer for nonuniform linear array based on second order cone programming

Adaptive broadband beamforming is a key issue in array applications. The adaptive broadband beamformer with tapped delay line (TDL) structure for nonuniform linear array (NLA) is designed according to the rule of minimizing the beamformer's output power while keeping the distortionless response (DR) in the direction of desired signal and keeping the constant beamwidth (CB) with the prescribed sidelobe level over the whole operating band. This kind of beamforming problem can be solved with the interior-point method after being converted to the form of standard second order cone programming (SOCP). The computer simulations are presented which illustrate the effectiveness of our bearaformer.