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2003-2021 全部
为您找到包含“863 Program”的内容共21

Yu Yue,Zhao Yongli,Yu Xiaosong,Zhang Jie,Gui Keyi

Routing and spectrum allocation is one of the most important problems in flexi-grid optical networks. Flexi-grid opticla network can improve the spectrum efficiency to a large extent compared with traditional fixed grid WDM optical networks. While the dynamic lightpath setup and teardown procedure will inevitably lead to traffic unbalancing which may block the new connections under the constraints of spectrum continuity and consecutiveness. Traffic balancing can distribute the services into the entire network, and then the probability of service collisions will be reduced. Simulation results indicate that RSA algorithm which consider the performance of traffic balancing is better than the one which only consider the performance of spectrum resource utilization.

2012-12-13

863 program (2012AA011301)

Institute of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications,Institute of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications,Institute of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications,Institute of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications,School of Information and Communication Engineering, Beijing University of Posts and Telecommunications

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

李圆圆,高冠军,张楷,张杰

2014-10-23

本文针对100Gbit/s PDM-QPSK WDM系统,在无链路色散补偿的相干传输、跨段链路配置不规则的情况下,提出光网络传输性能的评估与优化策略,提出了三种传输性能优化策略,通过对比仿真结果,证明最优化算法与每跨段中心功率相同的算法,相比于现网中初始设置的损耗完全补偿算法的最优解,传输性能提高约1.5dB,而每跨段中心功率相同算法算法复杂度低,优化效果好,可以被广泛应用于光纤链路中传输性能的优化。

863 program (2012AA011301)

北京邮电大学信息光子学与光通信研究院,北京,100876,北京邮电大学信息光子学与光通信研究院,北京,100876,北京邮电大学信息光子学与光通信研究院,北京,100876,北京邮电大学信息光子学与光通信研究院,北京,100876

#电子、通信与自动控制技术#

0评论(0 分享(0)

LI Xu,LI Ning

Indoor Positioning for Location Based Service (LBS) is required in various applications, such as emergency first-aid, store automation, large building management and others. However, compared to communication supplement system, current satellite navigation systems like GPS and Beidou cannot cover indoor environment well as satellite signals are unable to penetrate multi-walls. This paper introduces research on utilization of indoor supplement antennae in mobile communication system to realize indoor positioning for LBS. The propagation of indoor positioning signals was analyzed by establishing indoor signal fading model Multi-floors Routing Loss Model (MRLM). Considering the difference of positioning and communication, effects of current indoor antennae distribution were simulated in matlab and actual test was accomplished as well. The results demonstrate that indoor antennae satisfies positioning demand basically where indoor LBS can be provided based on current communication supplement system in large scale with low cost upgrade.

2014-01-16

863 Program (No.SS2012AA120800

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876 ,School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876

#Electrics, Communication and Autocontrol Technology#

1评论(0 分享(0)

WANG Ning,LI Yan,WU Jian

In this paper, we experimentally demonstrated the generation of 40GHz phase stable short pulses based on cascaded Mach-Zehnder modulators (MZM). The pulse width is measured to be 4.2ps. The time jitter, extinction ratio (ER) and optical signal-to-noise ratio (OSNR) are measured to be better than 80fs, 18dB and 50dB respectively. The generated optical pulses can be further used for demultiplexing in 4*40GBaud/s optical time-division muletiplexing (OTDM) systems.

2013-05-10

National natural science foundation of China (No.61001121

“863” Program( No.60932004

“973” Program( No.61006041

State Key Laboratary of Informational Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876,State Key Laboratary of Informational Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876,State Key Laboratary of Informational Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876

#Electrics, Communication and Autocontrol Technology#

1评论(0 分享(0)

Hansheng Su,Junsheng Yu,Shaohua Liu,Xiaoming Liu,Yuan Mai,Qingang Wei

With the current and future requirements of space-borne microwave and millimetric wave instruments, particularly for earth observation, there has been considerable research effort put into large reflector antenna system worldwide. Dichroic are key components in the design of large reflector antenna systems. But the measurement performance of dichroic is usually different from simulation result, this problems will degrade the performance of the whole antenna systems very seriously. This paper presents the analysis of fabrication errors of two-layers dichroic for quasi-optical network, The Inter-layer Separation Distance (ISD) and the Unit cell Aligning Error (UAE) was modelled and analysised. The results show that The ISD and UAE will degrade the performance of the dichroic obviously, and the dichroic of rectangular elements is very sensitive to the UAE on X direction rather than that of the Y direction.

2009-02-09

CONSTIND(C1320061301

the National Natural Science Foundation of China( 60703036

(863) Program( 2006AA01Z163

Electronic Engineering School of Beijing University of Posts and Telecommunications,School of Electronic Engineering, Beijing University of Posts and Telecommunications,School of Electronic Engineering, Beijing University of Posts and Telecommunications,School of Electronic Engineering, Beijing University of Posts and Telecommunications,School of Electronic Engineering, Beijing University of Posts and Telecommunications,School of Electronic Engineering, Beijing University of Posts and Telecommunications

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

白云,郁小松,于一鸣,赵永利,张杰,桂柯易

2012-12-06

随着DWDM在核心节点的使用,网络的灵活性,可靠性都有了很好的保障,带宽容量也已经有了很大程度的提升。但是,这些年移动互联网飞速发展,各种新型业务层出不穷,对于带宽带宽和大容量业务的传输需求不断增加,给现有的网络带来了前所未有的压力。光流交换网络可以更好的适应这些业务。如何能够发挥光流交换网络高速处理的特点,从而高效的利用频谱资源,渐渐的引起人们的关注。这篇文章介绍了一种基于光流交换网络的流量疏导算法(Optical Grooming with Priority,OG-P),在一定程度上可以更加充分的利用现有资源,减少网络的阻塞率。仿真实验的结果证明这种算法可以实现上述目的,提升了网络性能。

RFDP Project (20090005110013

863 program(2012AA011301

111 Project(B07005

NSFC project (60932004

973 program(2010CB328204

北京邮电大学信息光子学与光通信研究院,北京 100876,北京邮电大学信息光子学与光通信研究院,北京邮电大学信息光子学与光通信研究院,北京邮电大学信息光子学与光通信研究院,北京邮电大学信息光子学与光通信研究院,北京邮电大学

#电子、通信与自动控制技术#

0评论(0 分享(0)

ZHU Wei,ZHANG Jie,HAN Jiawei

In this paper, the space-time block coding (STBC) technique using the polarization-time diversity is proposed and demonstrated in coherent optical communication systems. The simulation result shows that the STBC technique is effective to compensate PMD without equalization.

2013-01-08

RFDP Project (No.20090005110013

863 program (No.2012AA011301

NSFC project (No.60932004

973 program (No.2010CB328204

111 Project (No.B07005

State key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and telecommunications, Beijing 100876,State key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications, Beijing 100876,State key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications, Beijing 100876

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

Ye Liqiang,Li Zhoupeng

A composite catalyst has been prepared by mixing Ni powder, surface-treated Zr-Ni alloy and Pd/C and used as the anode catalyst in the direct hydrazine fuel cell (DHFC). The catalytic activity of these catalysts is evaluated by linear potential sweep, electrochemical impedance spectra (EIS) analysis, polarization measurement. A maximum power density of 106 mW cm-2 has been achieved by using the composite catalyst as the anode catalyst and Pt/C as the cathode catalyst at 0.407 V under ambient conditions. It is found that the composite catalyst shows lower polarization than other catalysts. Results from linear potential sweep and EIS confirm that the cell performance is determined by the anode electrocatalysis towards the oxidation of hydrazine.

2010-06-12

National Natural Science Foundation (No.20976156

863 program grant (No.2007AA05Z144

Doctoral foundation (No.20070335003

Department of Chemical Engineering & Biochemical Engineering, Zhejiang University,Department of Chemical Engineering & Biochemical Engineering, Zhejiang University

#Chemical Engineering#

0评论(0 分享(0)

Zhang Zhuoyun,Hou Chunping,Shen Lili

A novel stereo matching algorithm is proposed based on the sub-pixel matching scheme. Because much information of the scene is lost in the sampling grid, the disparity maps obtained by sub-pixel matching have more precise structures than those by integer-pixel matching. Sub-pixel values are essential to the performance. In order to compute the sub-pixel values as close as possible to the actual ones, we propose the half phase DCT (HPDCT) interpolation algorithm. It improves upon the DCT-based algorithm based on the characteristics of the disparity map. We also compare the HPDCT algorithm with the linear interpolation and nearest-neighbor interpolation algorithms. Both the subjective evaluation and objective index demonstrate the advantages of the proposed algorithm over integer-pixel matching and sub-pixel matching with the other two interpolation algorithms.

2010-09-15

863 Program (No. 2008AA01A320

the National Natural Science Foundation of China ( 2009B090300008 and 2009AA01Z306

School of Electronic and Information Engineering, Tianjin University,School of Electronic and Information Engineering, Tianjin University,School of Electronic and Information Engineering, Tianjin University

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

Jiqiang Liu,Sheng Zhong

Identity-based encryption (IBE) is a very useful tool in cryptography. It has many potential applications. However, existing IBE schemes are signicantly slower than regular public key cryptosystems; thus, they may not be able to meet the need of some applications in practice. In this paper, we propose a simple IBE scheme, using a technique of combined public keys. Our IBE scheme is very fast, having time costs close to those of a regular public key cryptosystem, the ElGamal cryptosystem. We show that our IBE scheme is semantically secure under the Decisional Diffie-Hellman (DDH) Assumption. In addition, we give an identity-based signature scheme using the same technique.

2009-03-20

NSF(CNS-0524030

863 Program((2007AA01Z410

973 Program(2007AA01Z177)

Research foundations of Beijing Jiaotong University(2007CB307101

Computer and Information Technology Department, Beijing Jiaotong University,Computer Science and Engineering Department, State University of New York at Bu產lo Amherst NY

#Computer Science and Technology#

0评论(0 分享(0)