基于分组纠错码指导的多分辨率SIC算法

采用维纳均衡器和能量均匀分布扩频矩阵的SOFDM系统在频率选择性衰落信道中的误比特率小于OFDM系统,但是维纳均衡器的使用引入了子信道间干扰,且SOFDM系统的各子信道信干比相等,现有的相继干扰消除(SIC)算法无法有效地消除该干扰.为解决这一问题,文中提出了基于分组纠错码指导的多分辨率SIC算法,描述了该算法的子信道间干扰消除原理和实现过程,并通过计算机仿真验证了该算法的有效性.     

A Soft Parallel Interference Cancellation Algorithm in WCDMA

A two-stage soft parallel interference cancellation (SPIC) algorithm in WCDMA system is proposed. The performance of the algorithm is analysed in perfect power control and near-far case, and the influence of the timing error on the system BER is discussed. Analysis and simulation show that the SPIC technique can enhance system capacity, and have a good ability to resist near-far impact. With its simple structure, it has good potential for practical applications.     

基于Gram-Schmidt正交化法的串行干扰消除算法

基于Gram-Schmidt正交化法,提出了一种改进的串行干扰消除算法.不同于传统的串行干扰消除算法,该算法运用Gram-Schmidt正交化法,通过扩频序列获取正交序列作为最优解扩码,使得检测器每一级最强用户的解扩码与其他用户的扩频码所张的子空间正交,从而实现对多址干扰的完全抑制.给出了具有幅度失配的系统误码率近似公式,讨论了幅度失配对检测性能的影响.仿真结果表明,改进算法能有效抑制CDMA系统中的多址干扰,改善系统性能.     

An Iterative Power Allocation Algorithm for Group-wise Space-Time Block Coding Systems

An iterative transmit power allocation (PA) algorithm was proposed for group-wise space-time block coding (G-STBC) systems with group-wise successive interference cancellation (GSIC) receivers. Group-wise interference suppression (GIS) filters are employed to separate each group's transmit signals from other interferences and noise. While the total power on all transmit symbols is constrained, all transmit PA coefficients are updated jointly according to the channel information at each iteration. Through PA, each detection symbol has the same post-detection signal to interference-and-noise ratio (SINR). The simulation results verify that the proposed PA algorithm converges at the equilibrium quickly after few iterations, and it achieves much lower bit error rates than the previous single symbol SIC PA and the fixed ratio PA algorithms for G-STBC systems with GSIC receivers .     

一种新的硬判决并行干扰消除算法

多址干扰的存在是影响CDMA系统性能和限定系统容量的重要因素。针对多址干扰信号的特点，研究了一种改进的硬判断决并行干扰多用户检测器。分析和仿真结果表明，该多用户检测器具有更好的性能和抗远近效应的能力，具有广泛的应用前景。     

智能天线系统中干扰抵消的算法研究

首先分析了智能天线在CDMA系统中应用,理论分析了通过空间特征向量来对其实现“零陷“,提出采用压低基站的上行干扰提升系统的性能的新算法,实验仿真显示:该算法通过空域滤波,能够显著提高系统性能.     

LAPPED TRANSFORM DOMAIN INTERFERENCE EXCISION USING MODIFIED MEDIAN FILTER

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Magnetic Tile Surface Defect Detection Based on Texture Feature Clustering

In the field of magnetic tile surface detection, artificial detection efficiency is low, and the traditional image segmentation algorithm cannot show good performance when the gray scale of the magnetic tile itself is small, or the image is affected by uneven illumination. In view of these questions, this paper puts forward a new clustering segmentation algorithm based on texture feature. This algorithm uses Gabor function spectra to represent magnetic tile surface texture and then uses a user-defined local product coefficient to modify Gabor energy spectra to get the center number of fuzzy C-means(FCM) clustering. Moreover, the user-defined Gabor energy spectra image is segmented by clustering algorithm. Finally, it extracts the magnetic tile surface defects according to the changes of regional gray characteristics. Experiments show that the algorithm effectively overcomes the noise interference and makes a good performance on accuracy and robustness, which can effectively detect crack,damage, pit and other defects on the magnetic tile surface.     

Improved Space-Time Selective Interference Cancellation Scheme for CDMA Systems

IntroductionAdaptiveantennaarrayscanreduceco channelinterference (CCI)fromotherusersaswellasmitigatetheeffectofmultipathfadinginwirelessenvironments .SinceCDMAsystemsareinterferencelimitedinnature ,smartantennahasbeenregardedasoneofthecoresystemcomponents…     

Signal Detection Algorithm Design Based on Stochastic Resonance Technology Under Low Signal-to-Noise Ratio

In the current 4 th generation(4 G)communication network,the base station with the same frequency transmission makes a serious interference among adjacent cells,and information transmission is susceptible to interference such as channel multipath fading and occlusion effect.Detecting effectively spectrum signal under low signal-to-noise ratio(SNR.),directly affects the whole performance of the wireless communication network system.This paper designs an energy signal detection algorithm based on stochastic resonance technology which transforms noise's signal energy into useful signal energy,and improves output SNR.The energy signal detection algorithm realizes the function of providing effective detection of signal under low SNR,and promotes the performance of the whole communication system.     

基于四元数的声压振速联合方位估计算法

常规MUSIC波达方向估计算法的缺点是不能处理相干信号.针对这一情况,文中引入了四元数理论,建立了二维矢量水听器的四元数输出模型,并在此基础上提出了一种声矢量阵声压振速联合方位估计算法.与常规MUSIC方位估计算法相比,该算法利用了四元数紧凑的数据表达形式和较强的正交性约束能力,降低了内存需求和运算复杂度,在不经过任何预处理的情况下可以分辨相干目标.同时,由于利用了声压振速的组合指向特性,算法抗各向同性干扰的能力较强.仿真实验证明了算法的有效性.     

极性双原子分子体系碰撞诱导转动传能的量子干涉效应

利用adiabatically corrected sudden近似研究了极性双原子分子体系单一三重混合态碰撞诱导转动传能的量子干涉效应,并计算了CO与HCl碰撞中的能量传递过程中的相干效应．     

Lattice-basis reduction precoding based on successive interference cancellation design for multiuser MIMO downlink system

Two kinds of lattice-basis reduction precoding schemes based on successive interference cancellation are proposed. The successive interference cancellation (SIC) structure can be obtained by either orthogonal and a right triangular matrix (QR) decomposition, or the Vertical Bell Labs Layered Space Time (VBLAST) algorithm which provides optimal user ordering. Moreover, the extended channel approach is applied to the proposed SICbased schemes. Simulation results show that the proposed schemes can achieve comparable BER performance to vector precoding (VP).     

物理帧时槽交换中改进的DWRR调度算法

传统的DWRR(defic itwe ighted round rob in)调度算法不能满足变速率实时多媒体业务时延要求.为此,提出了改进的DWRR调度算法(improved DWRR).该算法在DWRR的轮询过程中插入1个新的服务优先等级,从而有效地保证变速率实时多媒体业务的时延要求,并且也可有效地调度非实时业务.仿真结果表明,对变速率多媒体实时业务,改进的DWRR算法的平均队列时延为3.4 m s,比传统DWRR算法的平均队列时延(4.9 m s)降低了30.6%.     

基于自适应算法的单矢量传感器抗相干干扰

将矢量传感器组合指向性vs的零点对准已知的相干干扰方向,获得"干净"的目标信号,然后结合自适应算法抵消矢量传感器原始数据中各通道的相干干扰,达到抗相干干扰的目的.文中阐述了方法的原理,进行了多种情况下的仿真,并给出实验结果.仿真和实验结果表明该方法能有效抑制方位已知的相干干扰.     

基于干扰转移的登机新策略

在航空旅客运输中,过长的登机时间不仅降低了航空运输的便捷性,也给航空 公司带来了巨大的成本.为了减少登机时间,降低登机成本,本文采用仿真方法,首先对比 现有登机策略的效率,然后基于干扰转移的思想,在由外至内策略的基础上提出一种新 的登机策略.该策略按行李数量给旅客分配座位,行李数量多的安排在飞机后部,数量少 的安排在飞机前部,从而降低行李数量高的旅客产生干扰,实现过道干扰的转移,使得登 机总时间缩短.进一步考虑行李舱的容量,在此基础上又进行改进,使得新策略更加容易 实施,具有可操作性.     

铁路技术站到发线运用调整模型及算法

从满足车站到发线的运用要求、减少作业和进路交叉干扰出发，建立了铁路技术站到发线运用的调整模型；针对模型是一个非线性规划模型的特点。对交叉干扰产生的原因进行了分析。提出了其等价模型；根据等价模型特点。设计了求解该问题的遗传算法。并用实例进行了验证。其程序运行时间不超过100s.     

基于模拟退火算法的快速登机序列特性研究

合理组织乘客的登机过程可以有效地缩短登机时间,从而降低航空公司和机场管理者的运营及管理成本.首先,在分析造成登机时间延误各种因素的基础上,建立了能够反映乘客登机特征的元胞自动机仿真模型.其次,将该登机仿真模型嵌入到模拟退火算法中,求解出具有最小登机时间的乘客登机序列.最后,通过分析优化序列中的相关特性,可以看出：过道干扰是造成登机延误的主要因素,只有当座位干扰演变为过道干扰后才会对整体的登机时间产生影响;此外,最优序列中相邻登机乘客间的座位距离会随着人均存放行李时间的变化表现出不同的数值分布.     

Quantitative Analysis of impact of Bicycles on Vehicles in Urban Mixed Traffic

Bicycles create obvious impact on motor vehicles' behavior on urban road especially in China with mixed traffic. These influences can be divided into two states: friction and block interference. Based on the data of interference of bicycles on vehicles' driving in typical road section in Beijing, this paper quantitatively analyzes the velocity changing tendency of vehicles under different interference, velocity distribution frequency, and critical transformation of different interference state. The friction and block interference coefficients are also worked out, which are useful to compare interference degrees under different road conditions. As a result, the research based on sample data shows that the velocity distribution of vehicles has different characteristics under different interference state, and vehicles driving velocities are significantly different under the friction interference and block interference.     

消除单片机控制晶闸管出现干扰的一种有效方法

分析了单片机控制晶闸管存在的干扰因素和途径，指出了削弱和避免干扰所需满足的限制条件；提出了一种采用单片机８０Ｃ５５２控制晶闸管的电路结构和方法。本方法已应用在某人工合成金刚石压机的加热系统中，并收到良好效果。