一种基于改进FFT的MPSK载波估计方法

针对多进制相移链控(MPSK)信号相干解调中载波同步问题,提出一种基于Zoom FFT及频域内插的方法进行载波提取。该方法通过信号的非线性变换,在时频域内实现载波频率的粗估计,在此基础上通过频域内的插值校正实现载波的准确提取。仿真试验结果表明,本算法提取的载波具有较高的准确性,估计的最大相对误差只有10-6量级。该方法不需要特定图案的前导字,结构简单,可估计的载波频率适应范围大,在高信噪比的情况下硬件实现系统实时性好。     

Hierarchical structures of communication in a network organization

We analyze the intranet communication behavior of members of a company that was deeply committed to the principles of non-hierarchical communication structures and of post-bureaucratic organization. We observe a split between the symbolic activities for creating a non-hierarchical network organization and the actual intranet communication behavior of the organization members. In their daily communication on the intranet, they persistently reproduced hierarchical structures and official channels—elements typically associated with bureaucratic organizations. Further, we find many signals in the content of the intranet messages, reflecting a social hierarchy that has evolved within the organization. Thus, despite rhetoric to the contrary, our findings regarding this communication behavior show that, to all intents and purposes, this particular organization displayed characteristics similar to those of a traditional bureaucratic organization.     

涉外导游跨文化交际能力的培养

随着中国旅游业的发展,社会对涉外导游的需求越来越大,对导游的要求越来越高,而与此同时,中国目前的导游队伍无论是数量还是质量都无法适应旅游业进一步发展的要求。培养导游跨文化交际能力应做好以下三点：教学中加大对跨文化知识的传授;以学生为中心,培养学生交际能力;加大对学生进行中国传统文化教育。     

群时延失真对扩频通信性能影响的仿真与分析

首先简要介绍了卫星通信中扩频系统的基本模型和表达式，给出了系统在失真信道中进行计算机仿真的基本模型。然后，利用通信系统仿真软件包ACOLADE，建立了扩频系统在群时延失真信道中的仿真模型，建立了群时延失真信道模型，进行了QPSK、QPSK＋DS、QPSK＋FH等体制在群时延失真信道的特性仿_真分析，最后得出了一些有一定参考价值的分析结果。     

一种新的移动卫星综合信息网构架

移动卫星综合信息网与现有的移动卫星通信网有着很大的区别。本文提出一种可反映移动卫星综合信息网特点的天基信息综合系统（SI^3），给出SI^3的网络模型，分析了这种分层网络模型的优缺点，并给出一个具体的参考星座组网例子，最后分析了SI^3建设中面临的技术问题。     

MPEG-4视频编码技术及其在多媒体通信中的应用

本文较为详细地介绍了MPEG－4视频编码的主要技术及其功能与特点，并基于此标准提出了一个基于Internet网络的多媒体通信系统的设计方案。     

基于自适应算法的比特差错率测量方法

比特差错率是衡量数字通信系统传输可靠性的一个主要指标。在数字通信干扰效果研究的基础上，提出的一种测量比特差错率的自适应算法，并进行了仿真。仿真结果表明该算法简单、精确、科学，并满足实时性的要求。     

虚拟团队管理

这篇论文根据沟通的社会和任务维度提出了描述虚拟团队的四种模型,即"理想小组”、"职业小组”、"社会小组”、"麻木小组”.     

Estimating the Direction of Innovative Change Based on Theory and Mixed Methods

In predicting the direction of innovative changethe question arises of the valid measurement ofyet unknown variables. We developed and applied aresearch method that combines qualitativeand quantitative elements in one interview formatand an analysis tool suitable for these data. Animportant characteristic of the method is the useof a model based on more universal forcesunderlying the direct interests in a product ofthe stakeholders in a system. This allows directedstatements, with a provocative and sometimes atrade-off character, on which the opinion ofstakeholders is asked on a quantitative scale andwhich are further probed in a standardisedqualitative way. A modified spider-web model isdeveloped to present the results in an orderlyand comprehensive way. The method is validatedon research on the strategic development ofthe market of scientific communication andinformation as it is presently developing on theInternet.