基于最小二乘滤波器的空域视频掩盖算法

针对无线信道传输过程中可能出现的单个或连续宏块丢失现象,提出了一种有效的空-域差错掩盖算法.算法根据丢失像素点中是否含有边界,把丢失的像素点分为平稳点和非平稳点.对于不含有边缘的平稳点,采用线性插值的算法;对于含有边界的非平稳点,建立最小二乘滤波器(LS)模型,通过多方向的扫描方式得出预测值.实验结果表明,算法能够获得优秀的图像质量,在降低了复杂度的同时,适用于视频图像的实时传输.     

Robust Channel Estimation and Multiuser Detection for MC–CDMA Systems Under Narrowband Interference

In this paper, we present a robust adaptive channel estimator and a robust multiuser detector for wireless multicarrier code-division multiple access (MC–CDMA) systems under narrowband interference (NBI). The conventional least-squares (LS) channel estimator performs poorly when narrowband interfering signals contaminate the multicarrier systems. A new weighted recursive least M-estimate (WRLM) channel estimator is hence developed to estimate multipath fading channels in the presence of NBI. The new robust channel estimator resorts to M-estimate and weighted least-squares (WLS) techniques. Simulations show that the WRLM channel estimator offers substantial performance gain over conventional recursive least-squares (RLS), recursive least M-estimate (RLM) and weighted RLS (WRLS) channel estimators under NBI. With the estimated channel coefficients, a robust multiuser detector is proposed to jointly suppress multiple access interference (MAI) and NBI. The performance of the linear decorrelator will degrade substantially in the presence of NBI. A weighted least M-estimate (WLM) algorithm is therefore developed to combat the NBI. The WLM multiuser detector is also based on the weighted M-estimate concept. Numerical results show that the proposed WLM multiuser detector significantly outperforms over the conventional linear decorrelator, the robust decorrelator with M-estimate and the WLS detector under NBI.

激光三角位移计线性标定的研究

介绍了激光三角位移计的工作原理，并对激光三角位移计的响应特性进行线性标定所涉及到的理论与实验技术进行了分析，给出了实验结果。     

Minimal cost one-dimensional linear hybrid cellular automata of degree through 500

This letter is a supplement of the table of the minimal cost one-dimensional linear hybrid cellular automata with the maximum length cycle by Zhang, Miller, and Muzio [IEE Electronics Letters, 27(18):1625–1627, August 1991].This work was supported in part by Research Grants and Postgraduate Scholarships from the Natural Sciences and Engineering Research Council of Canada and by an equipment loan from the Canadian Microelectronics Corporation.     

坦克底盘与火炮匹配性评价平台研究

建立了坦克底盘与火炮匹配性评价的理论模型,应用虚拟样机技术和动力学软件ADAMS分析了坦克底盘与火炮参数化动力学模型,得出匹配性评价动态参数。以获得的评价参数为基础,使用SOLSERVER作为数据库开发平台,通过建立完整的火炮和坦克底盘的数据库结构,以VC^＋＋．NET作为编程工具,在平台内实现了匹配性评价的数学模型。     

Performances comparison of pulse-pair and 2-step prediction algorithms for the doppler spectrum estimation

In this work we use real data provided by terminal pulse Doppler radar (WSR-88D) echoes to estimate the windshear hazards disastrous for the aircraft takeoffs and landings. Briefly two different methods are used to estimate the received Doppler moments. The second central moment which is the variance of the wind speed is called width or shear. A first method is in the time domain and also called pulse-pair, while the second is in the frequency domain. The main aim of this study is a performances comparison of results provided by the two mentioned methods and assumes that the power spectrums of the received signals are approached with the Gaussian shape.     

一种WCDMA系统下行信道频偏估计算法及其性能分析

文章在深入研究WCDMA下行链路的信道结构及接收信号处理流程基础上,提出了一种在Rake接收机中,通过对P-CPICH（主公共导频信道）序列两次相关检测实现频偏估计的算法;同时,对该算法主要性能指标进行了分析及仿真,验证了算法的可行性。     

Computing the k-error joint linear complexity of binary periodic multisequences

Complexity measures for multisequences over finite fields, such as the joint linear complexity and the k-error joint linear complexity, play an important role in cryptology. In this paper we study a fast algorithm, presented by Venkateswarlu A, to computer the k-error joint linear complexity of a binary periodic multisequence. In this paper, the aim is mainly to complement the theoretical derivation and proof of the existing algorithm. Moreover, our algorithm reduces computation.     

基WMSA信道估计技术的WCDMA上行链路性能分析

本文对用控制信道中的导频符号,有杉多时隙加权平均信道估计技术的ＷＣＤＭＡ上行链路进行了性能仿真研究。仿真结果表明,参与信道估计的时隙数目、加权系数的选取应针对不同的信道衰落环境。结合仿真结果,讨论分析了前向纠划、ＲＡＫＥ接收机的指峰数及信道中可分解路径的平均功率之差对ＷＣＤＭＡ上行链路性能的影响。     

Direction finding using data-supported optimization

A novel data-supported optimization technique for maximum likelihood (ML) direction-of-arrival estimation is proposed. The essence of our approach is to optimize the likelihood function at certaindata-supported points obtained by a resampled root-MUSIC procedure. These points are shown to comprise a small but representative subset of all possible searching points and contain enough information for solving the ML problem.This work was supported in part by grants from the National Sciences and Engineering Research Council of Canada (NSERC), Ministry of Energy, Science and Technology (MEST) of Ontario, Communications and Information Technology Ontario (CITO), and by the Senior Individual Grant Program of the Swedish Foundation for Strategic Research.