自动车辆定位系统中的FSK/FM组合调制解调特性分析

介绍了自动车辆定位系统中的技术体系结构。讨论了核心技术通信中的FSK／FM组合调制与非相干解调的基本方法，分析了影响系统误比特率的几个因素。给出了不同条件下的组合FSK／FM调制解调特性比较。     

一种“新型”的关税同盟——混合型关税同盟

国际经济学界流行的看法,即认为贸易转移型关税同盟既可导致贸易创造又可导致贸易转移,是不正确的,这种所谓的贸易转移型关税同盟实际上是一种混合型关税同盟。一个混合型关税同盟包含了一个纯贸易创造型关税同盟和一个纯贸易转移型关税同盟,关税同盟的建立能否给某个加盟国带来福利的增加,取决于这两股相反作用力的相对强弱,若贸易创造大于贸易转移,则福利增加,反之则相反,若两者相当,则还能出现福利不变的情况。     

香港新股混合发行方式对我国新股发行实行询价的启示与借鉴

香港的新股发行方式是以累计投标与固定价格相结合的混合发行方式,本文对其发行过程与特点进行了分析。目前,我国股票市场具备了实行询价制的条件,但现在实行的询价制还存在着一些问题,本文对此提出了改进建议。     

Capturing social network effects in technology adoption: the spatial diffusion of hybrid rice in Bangladesh

In this paper, we demonstrate a method for measuring the effect of spatial interactions on the use of hybrid rice using a unique, nationally representative data set from Bangladesh. In order to circumvent the ‘reflection problem’, we consider an identification and estimation strategy employing a generalised spatial two‐stage least squares procedure with near‐ideal instruments to effectively identify causal influences. Results indicate that neighbour effects are a significant determinant of hybrid rice use. Further, using two specifications of spatial network systems, one based on same‐village membership (irrespective of distance) and the other based on geographical distance (irrespective of village boundary), we demonstrate that a network including nearby hybrid rice adopters is more influential than a network of more distant hybrid rice adopters, and merely having a network with a large number of adopters may be relatively meaningless if they are far away. Furthermore, we show that these network effects are much more important to hybrid cultivation than interactions with agricultural extension officers.     

基于字典学习的毫米波大规模MIMO系统混合预编码

针对毫米波大规模多输入多输出（MIMO）系统混合预编码方案设计的难题，采用字典学习的思想，提出了一种高精度混合预编码方案。该方案首先对全数字预编码矩阵的各列采用稀疏表示；进而按列将字典原子从稀疏表示中分离出来，通过对误差矩阵采用奇异值分解（SVD）来更新对应的字典原子，直到所有字典原子更新，以形成新的字典矩阵;最后，利用更新后的字典矩阵稀疏重构全数字预编码矩阵，以得到模拟预编码矩阵和数字预编码矩阵。仿真结果表明，相较于基于正交匹配追踪（OMP）的混合预编码方案，所提方案在提升系统频谱效率和降低误码率方面具有明显的优势。     

混合集成电路军品物料批次一致性约束下的库存研究

通过对混合集成电路军品物料批次现状的分析,将ABC分类法思想与经济订购模型相结合,并针对不同类的物料分别设定订购点和订购批量。该模型在某研究所进行了实际应用,取得了较好的库存控制效果。     

一种用PN码校正相控阵天线通道误差的新方法

为了校准相控阵天线通道间幅相误差,实现精确的数字波束形成,给出了一种用伪噪声序列（PN）码作为校准测试信号的在线校准方法（校准和通信可同时进行）。该方法由特定的校准站发送校准测试信号,被天线各阵元接收,并通过存在误差的各通道,在接收端用与发端相同的PN码作为本地信号与接收信号逐通道做相关运算,对各通道的相关峰值做比较可求出校准矢量进而完成校准。仿真结果表明,该方法可以有效校准相控阵天线通道间的幅相误差,校准后的波束方向图接近理想的波束方向图。     

基于博弈论的多基站协作波束成形

为抑制小区间干扰,提出了一种基于博弈论的多基站协作波束成形算法,并将该算法应用于多基站协作通信系统模型。该算法是在已知其他小区策略选择的情况下,最大化自身利益的迭代算法。在此基础上研究了将最大化用户速率问题转化为效用函数优化问题进行求解,然后证明其纳什均衡的存在性和唯一性,最后给出求解纳什均衡的步骤。仿真结果表明,相对于非协作算法,所提算法在期望用户方向上保持较高的增益,同时有效地零陷干扰用户,达到抑制小区间干扰的目的,并且具有很好的收敛性。     

混合中继转发机制下的资源分配

在基于放大转发（AF）和译码转发（DF）的混合中继转发机制模型下,为了使系统获得最大和速率,提出了相应的资源分配方案,在子载波对混合中继协议的判断选择和最优功率分配算法的基础上讨论了等效信道增益模型和非等效信道增益模型。在非等效信道增益模型中,为了降低计算复杂度提出了一种次优算法。在该机制模型下,系统自适应地选择AF或者DF转发,既克服了两种单一转发模式存在的弊端,又能获得更大的和速率,从而提高了资源利用率。仿真结果表明,当系统功率等因素变化时,该分配方案下的混合中继转发模型与传统的AF和DF模型相比系统和速率分别提高了60%和8%以上,充分说明了该系统的优越性。     

Human resource management with ‘Asian’ characteristics: a hybrid people-management system in East Asia

The central theme of this article is to illustrate the similarity and difference of people-management system among the key economies in East Asia. The article not only identifies what elements do exist in East Asian people-management system, but also examines other new elements being adopted into the existing system with the influences from the US and Europe. The authors analyse the information on the changes of people-management system, factors causing the changes and time. The common phenomenon is that when there is a crisis, then that may provide some opportunities for drastic changes. The authors conclude the article by pointing out that HRM is in a reforming process towards hybrid people-management system in East Asia. However, this reforming process is not one-way only. A triangle-influence between East Asia, Europe and the US is the reality. In addition, multi-factors are shaping the outcome of reforming people-management system in East Asia, identified as foreign influence, the State's influence, the stage of social and economic development, and national and organizational historical path. Other economies, no matter in East Asia or other parts of the world, may draw some lessons from this study.