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a scheme of channel estimation using cyclic prefix based on the measurement of the low-voltage power line channel model is presented.after obtaining the frequency response of pilot sub-channel under the state of comb-type pilot,the data sub-channel response is obtained by interpolating the frequency response in frequency direction.in the pilot-free data period,the estimation of the channel is carried out by using cyclic prefix in order to improve the performance of system error rate.

摘 要：通过实际测量给出低压电力线的信道模型，在此基础之上提出了利用循环前缀对信道进行估计的方法，即在梳状导频模式时，使用导频获得导频子信道频率响应后，对其在频域方向进行插值得到数据子信道响应，在其后没有导频的序列的数据周期内，使用循环前缀对信道进行估计，从而起到改善系统误比特性能的目的。

With the analysis of common methods of electronic defrayal communications network and authentication , we have studied out a secure communications scheme based on the smart card and the public key encryption in this paper .

本文通过对目前常见电子支付网络通信与认证方式的分析，提出了基于智能卡和公开密钥体系的电子支付网络系统保密通信方案，并详细论述了该方案相对于传统方案而言在解决电子支付网络系统保密通信方面的特点和优势。

The calculated results indicate that the choice of the limiter function in TVD scheme has an important influence on the numerical simulation which is carried out on the delta wing flow structure.

计算结果表明： TVD格式中限制器函数的选取对于三角翼绕流结构的计算结果具有较重要的影响。

Due to the numerical aperture of DVD pickup is large, and the characteristic size is small, the error of scalar diffraction theory is very large. The in-depth research work on vector diffraction of optical disc was carried out. The optical disk model was analyzed use the rigorous coupled wave theory, and some significative conclusion was obtained. These conclusions can use for guidance of scheme designing of optical pickup.

针对DVD读取头光学系统数值孔径大，光盘特征尺寸小，标量衍射理论误差大等缺点，采用矢量衍射理论对光盘的衍射进行了深入的研究，首次在光学读取头领域中将耦合波理论应用到光盘的衍射分析中，得到了一些有意义的结果，这些结果可以用来指导光学读取头方案的设计。

On the basis of the analysis of cold extrusion process for the duralumin drive wheel,the scheme,the drawing and the blank dimension of cold extrusion were worked out.

对硬铝主动轮的冷挤压工艺进行分析，确定了冷挤压零件图和冷挤压方案及毛坯尺寸，对零件冷挤压的变形程度进行了校核，计算了挤压吨位，拟定了挤压前的毛坯处理规范，并对模具结构进行了介绍。

Within this context, four specific areas are addressed:(1) By means of finite integration technique, a new kind of the first order partial difference equation is derived from the original disperse transmission line equation of the uniform waveguide's. As it is the kind of one dimension Dirichlet's boundary problem, it is convenient for us to solve this equation from the leapfrog scheme. Because computation is carried out in one dimension, both high calculation efficiency and precision have been obtained in this method. Meanwhile, this method provide us a different selection to simulate the transient response of waveguide with non-simplical, for examples cylinder and elliptic waveguide, and avoid solving the second order equation, or using finite difference time domain to simulate a three dimension problem, sometimes the latter precision is not satisfied with the need, or low efficiency.

在这一研究内容下，主要研究四个方面的问题：(1)在完成金属波导传输线方程时域形式的基础之上，应用有限积分技术，把波导特征模式的色散传输线方程，化简为一组新的一阶偏微分方程组，该边值问题属一维Dirichlet边值问题，从而便于用蛙跳格式求解，由于是在一维中计算，该方法具有很高计算效率和精度，从而避免了以往为得到金属波导中特征模的时域响应特性，须要求解二阶方程，或用时域有限差分方法求解三维问题的方法，对于后者来说，计算有时是不准确的，或是很耗时的例如计算诸如圆波导、椭圆波导等其它复杂形状的波导。

The software and hardware realizing scheme of high performance, AC servo system based on the digital-analog mixed type of 16 bits high performance, single piece micro computer 80C196 is presented in this paper It expounds the theory and method of system design for industrial applications, and it also gives out the situation of system industrial applications Based on the analysis of the influential characteristics of servo system the method of improving the system precision, estimative model of loading torque and instantaneous velocity, compensative predictive control under low speed motion are dicussed in this paper.

论述了面向工业对象的系统设计原理与方法。并给出了本文系统工业应用的情况。在分析影响交流伺服系统性能的基础上，提出了改善系统精度的方法，给出了负载力矩和瞬时转速的估计模型，研究了低速运行时的补偿预测控制，提高了伺服系统低速稳定运行的范围。

The third part analyse the scheme of the PLC control system, base on the boiler need coal continuously, we excogitate a new method to commissioning the system and give out a particular data for optimizing the fieldbus.

论文第三章分析了PLC系统的设计方案，并针对工程不停机改造的特点着重分析了系统的设计方案和现场总线的优化方案，给出了具有参考指导意义的网络优化数据。

Four-level read scheme is adopted for General Purpose Register design in order to reduce the fan-out of the data bus.As to verification, much research is focused on FPGA prototype technology. After making a detailed verification strategy, FPGA verifation platform is built.

探讨了Flash存储器的在线编程问题，利用FPGA实现了对Flash的在线编程；遵照FPGA原型实现流程对设计进行了仿真、综合和布局布线；对边界扫描测试技术进行了研究，开发了用于FPGA边界扫描测试的软件。

According to this fault block reservoir and its fluid characteristic, using numerical simulation technique, based on heterogeneous geological model, optimal study of production scheme was carried out.

针对本断块油藏及其流体特征，运用数值模拟技术，在建立非均质地质模型的基础上，进行了开采方式的优化研究。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。