直扩信号检测与估计的改进

对低信噪比下直接序列扩频(DS／SS)信号的检测和估计提出了一种新的改进思路。在通常数值处理前加设一预处理模块，该模块能改善白噪声背景下信号的信噪比，从而为进一步提高低信噪比信号检测与估计的能力给出了一条新的途径。     

小波包在Chirp信号检测与时延估计中的应用

在Chirp信号探测中 ,利用发射信号和反射信号之间的时频分布相似性 ,提出用小波包变换时频分布的二维相关算法 ,估计接收信号中各个反射信号分量的时间延迟。该方法具有很强的压制噪声的能力 ,能从 - 5dB的接收信号中很准确地进行Chirp信号检测和时延估计     

利用A/D和D/A实现频率变换的技术分析

通过建立A/D、D/A的数学模型,推导了A/D、D/A实现变频的基本公式,分析了量化噪声和变频损失,总结了其主要特点及其与模拟混频器的区别,说明A/D和D/A实现频率变换是切实可行的,在进行模数、数模转换的同时实现变频,有利于节省器件,简化电路。     

一种基于AD6620的中频数字解调方案

AD6 6 2 0是美国AD公司推出的功能强大的数字下变频信号处理器 ,本文提出了一种基于该芯片设计的中频数字正交解调方案 ,实验结果表明该方案结构简单 ,易于实现 ,且精度高、误差小。     

产品与技术开发健壮设计信噪比分析

详细分析了产品与技术开发过程中,健壮设计试验可控因素间存在交互作用而产生的负效应.利用轴与轴上零件间由于过盈配合所产生的压应力试验,用产生压应力的可控因素间的交互作用.进行了实例分析,充分体现了可控因素间交互作用的后果,并提出了解决办法.     

Comparing early warning systems for banking crises

Despite the extensive literature on prediction of banking crises by Early Warning Systems (EWSs), their practical use by policy makers is limited, even in the international financial institutions. This is a paradox since the changing nature of banking risks as more economies liberalise and develop their financial systems, as well as ongoing innovation, makes the use of EWS for informing policies aimed at preventing crises more necessary than ever. In this context, we assess the logit and signal extraction EWS for banking crises on a comprehensive common dataset. We suggest that logit is the most appropriate approach for global EWS and signal extraction for country-specific EWS. Furthermore, it is important to consider the policy maker's objectives when designing predictive models and setting related thresholds since there is a sharp trade-off between correctly calling crises and false alarms.     

软件能力成熟度模型(CMM)的信号传递机制分析

本文利用信息经济学的理论，对软件质量控制的方法即软件能力成熟度模型(CMM)的信号传递机制，进行了分析。CMM的5级模型，能够很好地满足企业不断开发出具有更高能力等级信号的要求。     

正交频分多路（OFDM）的实现方式及性能分析

本文简述了ＯＦＤＭ的两种实现方式，比较了各自的优缺点，并对其中一种方式做了改进，指出了改进后的ＯＦＤＭ能更好的克服多径干扰的原因，最后对ＯＦＤＭ可以应用的领域进行了介绍。     

COSTLY EVIDENCE AND SYSTEMS OF FACT-FINDING

This paper compares the relative merits of adversarial and inquisitorial systems of civil procedure in the presence of evidence suppression. Each party has the incentive to suppress evidence that may damage her case, and to reveal any evidence that strengthens her case. I model the decision of a litigant to suppress evidence. The court conditions its action (transfers between the parties) upon the evidence which is revealed. Enforcement costs, which are the cost of suppression and the cost of requesting evidence, are a loss to the relationship and form the basis for my evaluation of the relative merits of each system. I find that neither system always outperforms the other. The strength of the inquisitorial system is that it allows for randomization over evidence requests, which leads to lower expected enforcement cost. Litigants cannot commit to randomize as they are motivated by the expected award in litigation. The strength of the adversarial system is that it sometimes allows litigants to utilize their information about the level of suppression.     

ITU G.732.1语音编码器在DSP上的实时实现

ＩＴＵＧ。７２３．１建议的编码速度为５．３和６．３ｂｉｔ／ｓ的双码率编码方案是一种运算复杂的用于多媒体通信中的低码率语音编码器。本文介绍了该编码器的算法原理和在一片ＴＭＳ３２０Ｃ５４１定点ＤＳＰ芯片上实时实现该编码器过程中的软，硬件结构及关键技术。