Multiple change-points estimation of moving-average processes under dependence assumptions

In this paper, some results of convergence for a least-square estimator in the problem of multiple change-points estimation are presented and the moving-average processes of ρ-mixing sequence in the mean shifts are discussed. When the number of change points is known, the consistency of change-points estimator is derived. When the number of changes is unknown, the consistency of the change-points number and the change-points estimator by penalized least-squares method are obtained. The results are also true for φ-mixing, α-mixing, associated and negative associated sequences under suitable conditions.     

RF channel performance assessment for a multiple carrier millimeter-wave communication system

Channel capacity, system versatility and ease of maintenance are factors of prime concern in future generations of wireless communication systems. As a result, millimeter-wave can offer considerable advantages in providing broadband interface. Nonlinearity and noise effects, including parametric fluctuations, are two significant causes for signal degradation in broadband communication systems. Two methods to assess the performance of an RF channel in a multi-carrier system are described. By measuring the forward transfer function from transmitter IF to receiver IF as the frequency is swept across the channel bandwidth, characteristics such as gain flatness, channel dispersion, and saturation effects are revealed. To evaluate the ability of the communication link in preserving the synchronization between two carriers, their heterodyned spectrum at the receiver IF output is studied. Both measurement methods employ standard equipment and have been found to be effective when applied to a multi-carrier millimeter-wave system with over 1 GHz instantaneous bandwidth.     

多天线OFDM系统的线性优化

从Jakes信道模型出发,用KKT优化方法,从信道部分特性已知的情况推导了多天线OFDM系统中发射机与接收机的线性最优化设计问题。仿真比较了多天线OFDM系统的各个子载波之间采用合作的线性优化与非合作的线性优化两种方法在不同最大多普勒频移和反馈时延下发送符号的均方误差。仿真结果表明,当信道特性部分已知时,子载波之间合作的线性优化较之非合作的线性优化有更小的均方误差。可为存在反馈时延的多天线OFDM系统设计提供指导     

基于DPCA、ATI和MUSIC的动目标检测方法

针对SAR(合成孔径雷达)动目标检测,提出一种DPCA(中心相位偏置天线)、ATI(沿迹干涉)和MUSIC(多信号分类)相结合的三孔径动目标检测方法。该方法首先采用DPCA技术消除杂波干扰、检测运动目标,然后用ATI和MUSIC方法确定目标的位置和速度。理论分析和计算机仿真表明,该方法是有效的,不仅能够检测运动目标,而且能够精确估计其运动参数。     

基于多普勒谱的多目标鉴别技术

多目标鉴别是雷达信号处理中迫切需要解决的技术难题。针对Chirp脉冲雷达体制及其相参积累处理的原理和特点,利用多个目标的多普勒谱分布特性,提出了应用CLEAN算法的多普勒谱旁瓣抑制技术实现多目标鉴别。仿真结果表明了这种技术的有效性,且在信噪比较低的情况下仍然非常稳健。     

Design of TakagiSugeno fuzzy model based nonlinear sliding model controller

1.INTRODUCTION Sincethefirstpaperonfuzzysetswaspublished,fuzzy logiccontrol(FLC)hasattractedgreatattentionfrom boththeacademicandindustrialcommunities.Much progresshasbeenmadeinsuccessfullyapplyingFLCto industrialcontrolsystems.Manytheoreticalresultsabout stabilityanalysisanddesignoffuzzylogiccontrollersys temshavealsobeenobtained.Amongvariouskindsoffuzzycontrolmethods,manycontroldesignmethodshavebeenproposedon theTakagi Sugeno(T S)fuzzymodel[1].Thebasic ideaofthesemethodsincludestwos…     

卡诺图法化简异或逻辑函数

探讨了卡诺图化简异或逻辑函数的原理，提出了化简异或逻辑函数的新方法。     

基于组合策略的Lyapunov指数谱的计算

分析了基于BP神经网络模型的Lyapunov指数谱计算法存在的不足,提出了一种新的基于组合策略的混沌时间序列Lyapunov指数谱计算方法.由于该方法能够同时逼近给定目标函数的非线性部分与线性部分,因而具有更高的计算精度.最后将新方法应用于Henon映射Lyapunov指数谱的计算中.通过分析与比较,表明该方法具有更高的计算精度及更强的实用性.     

高维小波框架包子空间对空间L2(Rn)的分解

研究小波框架包子空间对空间L²(Rⁿ)的分解。运用时频分析方法与逼近论思想,刻画了数量矩阵伸缩的高维小波框架包的特征,构造了若干高维小波框架包子空间,进而,由小波框架包子空间得到了L²(Rⁿ)的直交分解式。给出高维小波框架包函数的频域表达式,类似于正交基,提出高维紧小波框架包构成空间L²(Rⁿ)的巴塞尔框架的充分条件,扩展了小波框架应用范围。