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BSC A接口IP化后MGW与BSC之间通过IP承载网连接,不再设置TDM电路。因此,导致BSC A接口IP化后备选同步从MGW不可提取,时钟接入存在安全隐患。本文主要从时钟同步规范、时钟接入方案场景、时钟接入方案测试结果等方面进行论述,帮助设计人员在工程设计中合理的选择BSC时钟同步方案。     

PROJECTION BASED STALTISTICAL FEATURE EXTRACTION WITH MULTISPECTRAL IMAGES AND ITS APPLICATIONS ON THE YELLOW RIVER MAINSTREAM LINE DETECTION

Mainstream line is significant for the Yellow River situation forecasting and flood control. An effective statistical feature extraction method is proposed in this paper.In this method,a be tween-class scattering matrix based projection algorithm is performed to maximize between-class dif ferences,obtaining effective component for classification;then high-order statistics are utilized as the features to describe the mainstream line in the principal component obtained.Experiments are per formed to verify the applicability of the algorithm.The results both on synthesized and real scenes indicate that this approach could extract the mainstream line of the Yellow River automatically,and has a high precision in mainstream line detection.     

The skew Schubert polynomials

We obtain a tableau definition of the skew Schubert polynomials named by Lascoux, which are defined as flagged double skew Schur functions. These polynomials are in fact Schubert polynomials in two sets of variables indexed by 321-avoiding permutations. From the divided difference definition of the skew Schubert polynomials, we construct a lattice path interpretation based on the Chen–Li–Louck pairing lemma. The lattice path explanation immediately leads to the determinantal definition and the tableau definition of the skew Schubert polynomials. For the case of a single variable set, the skew Schubert polynomials reduce to flagged skew Schur functions as studied by Wachs and by Billey, Jockusch, and Stanley. We also present a lattice path interpretation for the isobaric divided difference operators, and derive an expression of the flagged Schur function in terms of isobaric operators acting on a monomial. Moreover, we find lattice path interpretations for the Giambelli identity and the Lascoux–Pragacz identity for super-Schur functions. For the super-Lascoux–Pragacz identity, the lattice path construction is related to the code of the partition which determines the directions of the lines parallel to the y-axis in the lattice.     

Skew CR Submanifolds of a Sasakian Manifold

ＳｋｅｗＣＲＳｕｂｍａｎｉｆｏｌｄｓｏｆａＳａｓａｋｉａｎＭａｎｉｆｏｌｄＬｉｕＸｉｍｉｎ（刘西民）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＮａｎｋａｉＵｎｉｖｅｒｓｉｔｙ，Ｔｉａｎｊｉｎ，３０００７１）ＬｉａｎｇＸｉｑｕａｎ（梁希泉）（Ｉ...     

1024位6相时钟MOS图像传感器

介绍一种采用６相时钟电路的１０２４位ＭＯＳ图像传感器，其像元中心距为１５μｍ，移位寄存器采用５管动态无比电路，功耗小于０．５ｍＷ，且与位数无关。器件光敏面上沉积了ＳｉＯ２增透膜，提高了光电转换效率。给出了该器件光电参数测试结果。     

基于电吸收调制器的高速时钟信号的提取

对高速光时分复用系统中(2×10 Gb/s)基于电吸收调制器(EAM)的注入光电混合振荡器的时钟提取方法进行了实验验证. 实验证明,光电混合振荡器必须保证一定的增益才能提取出时钟,在此基础上,无论光电混合振荡器内或外的光功率的增加,将增加提取时钟的幅度,减小提取时钟的时间抖动.当偏置电压一定时,射频幅度增加,则电吸收调制器的窗口变窄,提取时钟幅度增大,抖动减小.     

基于FPGA的高频时钟的分频和分配设计

介绍了为PET(正电子发射断层扫描仪)的前端电子学模块提供时间基准而设计的一种新型高频时钟扇出电路。该电路利用FPGA芯片来实现对高频时钟的分频与分配，并用LVDS传输标准对生成的多路时钟信号进行传输，从而最大程度地减少了输出各路时钟之间的延时偏差，同时利用低压差分信号的传输特性增强了信号的抗干扰能力。文章给出了采用VHDL语言编写的时钟电路程序代码。     

采用相邻采样求和的突发模式相位插值型CDR

提出了一种具有良好抑制输入数据抖动性能的突发模式相位插值型时钟数据恢复电路。在传统相位插值型电路结构的基础上,在采样保持电路与相位插值电路之间加入一级求和电路,理论分析和仿真结果表明,恢复时钟相位变化受输入数据抖动的影响明显减小。电路基于1.1 V SMIC 40 nm 1P8M CMOS工艺搭建,其数据率为6.25 Gb/s,消耗功耗为6.7 mW,版图面积为0.35 mm²。     

面向TD—LTE传送网的架构分析与演进策略研究

结合陕西移动面向TD—LTE传送网问题,对TD—LTE承载需求、跨城域及城域内组网、城域内及跨城域回传方案、保护策略和时钟部署策略等进行了详细论述。