TD-SCDMA系统小区内干扰分析

为了研究并分析第三代移动通信TD-SCDMA系统小区内的干扰,奠定TD-SCDMA系统的容量、覆盖等基本性能指标的重要理论基础,在给出单载波小区干扰模型条件下,通过对单载波TD-SCDMA系统小区内符号间的干扰和多址干扰进行定性地研究与分析,给出了干扰的分析和计算方法,分析了智能天线和联合检测技术对TD-SCDMA系统干扰的影响,并通过实际组网条件下TD-SCDMA系统内的干扰进行了计算机仿真结果和分析,验证了对TD-SCDMA系统中对小区内干扰的研究与分析结论,从而得到了影响系统的容量、覆盖等基本性能指标重要的理论依据.     

TD-SCDMA集群通信系统干扰的研究

集群系统的呼叫业务大部分采用单点对多点的半双工通信方式,与TD-SCDMA系统普通呼叫的通信方式不同.文中研究和分析了TD-SCDMA集群通信系统中所存在的干扰,建立了干扰模型,阐述了各种干扰产生的过程和原因,并对其交叉时隙干扰进行了仿真和比较.仿真结果表明TD-SCDMA集群系统的交叉时隙干扰要比TD-SCDMA系统更加严重.     

TD—SCDMA系统中联合检测的原理和实现

联合检测技术是TD－SCDMA系统的关键技术之一,在介绍CDMA系统模型的基础上,详细分析了基于近零线性均衡的联合检测技术及其FPGA和DSP实现方法,它是TD－SCDMA系统中所用的一种抗多址及多径干扰技术,可以消除通信系统中的大部分干扰,从而降低了整个系统的误码率,使通信系统的容量和通信质量得以显著提高。     

基于协作多点的干扰协调技术

协作多点干扰协调技术是第四代移动通信中的关键技术,文中对此进行了全面回顾.内容主要分为3个方面:基站联合传输/顸编码、基站协作调度和基站联合检测/解码.基站协作传输主要表现在基站协作设计合适的预编码向量/矩阵,降低/避免用户间的干扰;基站协作调度表现在通过按照某种准则选择用户子集与基站通信,在系统吞吐量和通信公平性之间做出折中;基站联合检测/解码是通过基站间的协作对多个用户的信号进行译码.     

TD-SCDMA的技术优势

本文综述了中国的第三代移动通信系统(TD-SCDMA),它是基于同步码分多址技术(SCDMA)的未来陆地通信系统,广泛采用了智能天线、接力切换、软件无线电和联合检测技术,工作于TDD方式,并指出了该系统存在的问题和解决途径。     

MB-UWB系统中的干扰检测研究

分析研究了MB-UWB通信系统的干扰检测算法.针对传统MB-UWB通信系统中所存在的数据传输速率的不足,提出了改进的并行MB-UWB的系统方案,为了获得传输数据速率的提高,该方案采用了并行体制,并对MB-UWB系统各子带信号的正交化进行了设计.对改进的并行MB-UWB通信系统进行了数学分析和描述.基于并行MB-UWB系统方案,进一步提出了一种新的低采样率的干扰检测算法,并对该算法的处理过程和可行性进行了数学分析和系统仿真.分析和仿真结果表明,所提新算法可在较低的采样速率上,完成对与共存干扰的有效检测,并可与改进的MB-UWB通信系统的干扰抑制处理相结合,明显改善共存UWB系统的误码率性能.     

多用户检测对CDMA系统容量的影响

CDMA通信系统中，各个用户信号之间的相关性导致了多址干扰。随着用户数的增加或信号功率的增大，多址干扰就成为宽带CDMA通信系统的一个主要干扰。多用户检测（MUD）是宽带CDMA通信系统中抗干扰的关键技术，就是在传统检测技术的基础上，充分利用造成多址干扰的所有用户信号信息对单个用户的信号进行检测，有效地消除多址干扰。笔者从理论上分析了CDMA系统在不采用和采用MUD时用户容量的表达式，提出了利用MUD技术增加系统容量的多种实现方法；在此基础上，通过MATLAB仿真来分析采用MUD对CDMA系统容量的影响。通过理论分析和仿真得出结论：MUD效率越高，CDMA系统容量改善越好；同样的MUD效率下，数据速率越低，小区间干扰越小，比特能量功率谱密度之比低，CDMA系统容量的改善越好。     

TD-SCDMA集群系统中多小区联合检测和宏分集技术的研究

在TD-SCDMA集群系统的一个载频和时隙中,信号是以广播的方式传输的,这就导致了信号的小区间多址干扰(MAI)和码间串扰(ISI)很严重,文中讨论两种可以同时抵消MAI和ISI的联合检测算法(迫零块均衡器和最小均方误差块均衡器)对TD-SCDMA集群系统性能的影响。同时,考虑到集群系统的特点,当同目标群组的用户分别在不同的小区的时候,宏分集技术可以用来进一步提高系统的性能。仿真结果表明联合检测算法和宏分集技术可以明显提高系统性能。     

一种多址移动通信系统异步Schwarz串行干扰消除算法

针对多址通信系统中的串行干扰消除(SIC)多用户检测算法检测过程因用户功率排序错误导致判决误差扩散进而算法检测精度下降、收敛性不足及移动通信系统整体性能下降的问题,结合Schwarz算法对强多址干扰和码间干扰情况下直接序列扩频码分多址(DS-CDMA)系统中的SIC算法进行了研究,提出了一种Schwarz-SIC多用户检测算法(S-SIC)。新算法通过Schwarz约束条件实现对各用户功率子域边值的精确控制,减少用户排序出错,可全面跟踪时变信道,且在干扰消除检测过程中有效避免判决误差的扩散,抑制MAI及ISI的影响。在误码性能、收敛性,动态跟踪能力及算法精度方面较原有SIC算法有较大提高。仿真结果验证了新算法是一种有效的多址通信系统干扰消除算法。     

第三代移动通讯TD-SCDMA系统与WCDMA系统共存问题的研究

根据TD-SCDMA和WCDMA的标准规范,从理论上分析了TD-SCDMA基站和WCDMA基站在同一地理区域共存或共站址时相互间的干扰,论述了FDD／TDD系统共存研究的方法,对FDD／TDD干扰产生的相对容量的损失进行了仿真,给出了工程实施的解决方法．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has