软件无线电中正交数字变频的DSP实现

介绍了软件无线电的概念及DSP基本原理,利用DSP实现软件无线电中的正交数字变频技术,给出了中频下变频的数字化实现的主程序.     

关于超主权货币的思考

二战后,美国凭借其经济、军事实力,建立了以美元为主要储备货币的国际货币体系。然而,由美国次贷危机引发的全球金融危机用事实证明了目前国际货币体系的内在缺陷,演绎了新一轮的美元“特里芬悖论”。在世界愁于为美国买单之时,周小川行长提出“超主权货币”的国际货币体系改革构想,为世界货币体系改革注入了新的血液。然而冰冻三尺非一日之寒,经济实力、国’际分歧等种种不确定因素,使超主权货币这一构想任重而道远。     

Concordance-based estimation approaches for the optimal sufficient dimension reduction score

To characterize the dependence of a response on covariates of interest, a monotonic structure is linked to a multivariate polynomial transformation of the central subspace (CS) directions with unknown structural degree and dimension. Under a very general semiparametric model formulation, such a sufficient dimension reduction (SDR) score is shown to enjoy the existence, optimality, and uniqueness up to scale and location in the defined concordance probability function. In light of these properties and its single-index representation, two types of concordance-based generalized Bayesian information criteria are constructed to estimate the optimal SDR score and the maximum concordance index. The estimation criteria are further carried out by effective computational procedures. Generally speaking, the outer product of gradients estimation in the first approach has an advantage in computational efficiency and the parameterization system in the second approach greatly reduces the number of parameters in estimation. Different from most existing SDR approaches, only one CS direction is required to be continuous in the proposals. Moreover, the consistency of structural degree and dimension estimators and the asymptotic normality of the optimal SDR score and maximum concordance index estimators are established under some suitable conditions. The performance and practicality of our methodology are also investigated through simulations and empirical illustrations.     

论国际税收争议解决程序中的SDR

目前,各国一般通过相互协商程序解决国际税收争议。然而,由于相互协商程序存在着某些缺陷,不能保证国际税收争议一定得到解决。因此,在相互协商程序之外,需要一种补充性争议解决方式(SDR)。国际税收争议解决程序中的SDR包括调解、咨询意见和仲裁,其中又以仲裁最具发展潜力。如果各国能在税收协定中规定强制仲裁,就能保证国际税收争议的积极解决,从而为国际贸易和国际投资创造良好的税收环境。     

新形势下人民币国际化风险研究

在美元指数持续走强、欧洲央行推出新一轮 QE 政策、我国经济增长放缓和贸易顺差急剧收窄的背景下,人民币国际化面临着汇率双向波动幅度加大、货币替代和反向货币替代交替出现、加大股市波动幅度,易引发系统性风险、特里芬难题、国际金融危机外溢和受现有国际货币阻扰的一系列风险。为此,需从建立外汇风险预警防范机制、适时推出外汇衍生产品、谨慎开放资本项目及加强国际交流合作等方面进行风险的防范和化解。